This page has only limited features, please log in for full access.
Sustainable and safe energy sources combined with cost effectiveness are major goals for society when considering the current scenario of mass production of portable and Internet of Things (IoT) devices along with the huge amount of inevitable e‐waste. The conceptual design of a self‐powered “eco‐energy” smart card based on paper promotes green and clean energy, which will bring the zero e‐waste challenge one step closer to fruition. A commercial raw filter paper is modified through a fast in situ functionalization method, resulting in a conductive cellulose fiber/polyaniline composite, which is then applied as an energy harvester based on a mechano‐responsive charge transfer mechanism through a metal/conducting polymer interface. Different electrodes are studied to optimize charge transfer based on contact energy level differences. The highest power density and current density obtained from such a paper‐based “eco‐energy” smart card device are 1.75 W m−2 and 33.5 mA m−2 respectively. This self‐powered smart energy card is also able to light up several commercial light‐emitting diodes, power on electronic devices, and charge capacitors.
Guilherme Ferreira; Sumita Goswami; Suman Nandy; Luis Pereira; Rodrigo Martins; Elvira Fortunato. Touch‐Interactive Flexible Sustainable Energy Harvester and Self‐Powered Smart Card. Advanced Functional Materials 2019, 30, 1 .
AMA StyleGuilherme Ferreira, Sumita Goswami, Suman Nandy, Luis Pereira, Rodrigo Martins, Elvira Fortunato. Touch‐Interactive Flexible Sustainable Energy Harvester and Self‐Powered Smart Card. Advanced Functional Materials. 2019; 30 (5):1.
Chicago/Turabian StyleGuilherme Ferreira; Sumita Goswami; Suman Nandy; Luis Pereira; Rodrigo Martins; Elvira Fortunato. 2019. "Touch‐Interactive Flexible Sustainable Energy Harvester and Self‐Powered Smart Card." Advanced Functional Materials 30, no. 5: 1.
Sumita Goswami; Gowra Raghupathy Dillip; Suman Nandy; Arghya Banerjee; Ana Pimentel; Sang Woo Joo; Rodrigo Martins; Elvira Fortunato. Biowaste-derived carbon black applied to polyaniline-based high-performance supercapacitor microelectrodes: Sustainable materials for renewable energy applications. Electrochimica Acta 2019, 316, 202 -218.
AMA StyleSumita Goswami, Gowra Raghupathy Dillip, Suman Nandy, Arghya Banerjee, Ana Pimentel, Sang Woo Joo, Rodrigo Martins, Elvira Fortunato. Biowaste-derived carbon black applied to polyaniline-based high-performance supercapacitor microelectrodes: Sustainable materials for renewable energy applications. Electrochimica Acta. 2019; 316 ():202-218.
Chicago/Turabian StyleSumita Goswami; Gowra Raghupathy Dillip; Suman Nandy; Arghya Banerjee; Ana Pimentel; Sang Woo Joo; Rodrigo Martins; Elvira Fortunato. 2019. "Biowaste-derived carbon black applied to polyaniline-based high-performance supercapacitor microelectrodes: Sustainable materials for renewable energy applications." Electrochimica Acta 316, no. : 202-218.
Our experimental outturn opens up a new vision by proposing mechano-responsive charge transfer mechanism (MRCTM) to π-conjugated polymers in the field of human-motion interactive energy harvester. Doped polyaniline (d-PANi) has been used to functionalize conducting textile fibers (f-CTFs) and integrated with our proposed design for wearable power plant. Each f-CTF generates current by patting, bending, or even soft touching. Localized force deformation at the metal/polymeric interface layer with direct visualization of charge distribution pattern has been extensively studied by atomic force microscopy. The integrated arrays of f-CTFs produce a peak power-density of ∼0.6 W m−2 with output current-density of ∼22 mA m−2 and can power at least 10 white LEDs of 2.5 W. The procured energy from f-CTFs is capable of charging a commercial 10 μF capacitor to 3 V in 80 s and powering portable electronic devices. The prototype energy harvester stably shows the same performance after more than 100 thousand times of patting, bending or twisting.
Sumita Goswami; Andreia dos Santos; Suman Nandy; Rui Igreja; Pedro Barquinha; Rodrigo Martins; Elvira Fortunato. Human-motion interactive energy harvester based on polyaniline functionalized textile fibers following metal/polymer mechano-responsive charge transfer mechanism. Nano Energy 2019, 60, 794 -801.
AMA StyleSumita Goswami, Andreia dos Santos, Suman Nandy, Rui Igreja, Pedro Barquinha, Rodrigo Martins, Elvira Fortunato. Human-motion interactive energy harvester based on polyaniline functionalized textile fibers following metal/polymer mechano-responsive charge transfer mechanism. Nano Energy. 2019; 60 ():794-801.
Chicago/Turabian StyleSumita Goswami; Andreia dos Santos; Suman Nandy; Rui Igreja; Pedro Barquinha; Rodrigo Martins; Elvira Fortunato. 2019. "Human-motion interactive energy harvester based on polyaniline functionalized textile fibers following metal/polymer mechano-responsive charge transfer mechanism." Nano Energy 60, no. : 794-801.
Electrorheological fluids have been paying a lot of attention due to their potential use in active control of various devices in mechanics, biomedicine or robotics. An electrorheological fluid consisting of polarizable particles dispersed in a non-conducting liquid is considered to be one of the most interesting and important smart fluids. This work presents the effect of the dopant, camphorsulphonic acid or citric acid, on the electrorheological behaviour of suspensions of doped polyaniline nanostructures dispersed in silicone oil, revealing its key role. The influence of carbon nanoparticle concentration has also been studied for these dispersions. All the samples showed an electrorheological effect, which increased with electric field and nanostructure concentration and decreased with silicone oil viscosity. However, the magnitude of this effect was strongly influenced not only by carbon nanoparticle concentration but also by the dopant material. The electrorheological effect was much lower with a higher carbon nanoparticle concentration and doped with citric acid. The latter is probably due to the different acidities of the dopants that lead to a different conductivity of polyaniline nanostructures. Furthermore, the effect of the carbon nanoparticles could be related to its charge trapping mechanism, while the charge transfer through the polymeric backbone occurs by hopping. Polyaniline/camphorsulphonic acid composite nanostructures dispersed in silicone oil exhibited the highest electrorheological activity, higher than three decades increase in apparent viscosity for low shear rates and high electric fields, showing their potential application as electrorheological smart materials.
Jenifer Santos; Sumita Goswami; Nuria Calero; Maria Teresa Cidade. Electrorheological behaviour of suspensions in silicone oil of doped polyaniline nanostructures containing carbon nanoparticles. Journal of Intelligent Material Systems and Structures 2019, 30, 755 -763.
AMA StyleJenifer Santos, Sumita Goswami, Nuria Calero, Maria Teresa Cidade. Electrorheological behaviour of suspensions in silicone oil of doped polyaniline nanostructures containing carbon nanoparticles. Journal of Intelligent Material Systems and Structures. 2019; 30 (5):755-763.
Chicago/Turabian StyleJenifer Santos; Sumita Goswami; Nuria Calero; Maria Teresa Cidade. 2019. "Electrorheological behaviour of suspensions in silicone oil of doped polyaniline nanostructures containing carbon nanoparticles." Journal of Intelligent Material Systems and Structures 30, no. 5: 755-763.
The potential of electrorheological (ER) suspensions based on polarizable particles in simple liquids relies on the particles arrangements which turn their quasi Newtonian behavior into gel-like. However, minor attention has been paid to the effect provoked by the liquid viscosity on the ease of orientation and assembly of the particles. With this aim, a study on the ER behavior, at 25ºC, of 1 wt.% suspensions of polyaniline-based hybrid particles (-graphene or –tungstene oxide) in silicone oil with varying viscosities (20, 50 and 100 cSt) was carried out. The electric field effect was higher for the polyaniline-graphene particles suspension in the less viscous silicone oil. However, two drawbacks were observed: a) higher leakage current flows; and b) reduced reversibility upon the electric field was turned off. The use of silicone oil with higher viscosity solved these issues.
Claudia Roman; Moises Garcia-Morales; Sumita Goswami; Ana Marques; Maria Teresa Cidade. The electrorheological performance of polyaniline-based hybrid particles suspensions in silicone oil: influence of the dispersing medium viscosity. Smart Materials and Structures 2018, 27, 075001 .
AMA StyleClaudia Roman, Moises Garcia-Morales, Sumita Goswami, Ana Marques, Maria Teresa Cidade. The electrorheological performance of polyaniline-based hybrid particles suspensions in silicone oil: influence of the dispersing medium viscosity. Smart Materials and Structures. 2018; 27 (7):075001.
Chicago/Turabian StyleClaudia Roman; Moises Garcia-Morales; Sumita Goswami; Ana Marques; Maria Teresa Cidade. 2018. "The electrorheological performance of polyaniline-based hybrid particles suspensions in silicone oil: influence of the dispersing medium viscosity." Smart Materials and Structures 27, no. 7: 075001.
Reduce-reuse-recycle, the three ‘R’ factors are building blocks towards managing the waste products not only of the industries, but also from households. In article number 1700137 by Suman Nandy, Elvira Fortunato, and co-workers, waste carbon from a cooking oven is directly percolated into polyaniline. Such composite grasping waste carbon by a cheap, an eco-friendly process, as well as having unique optoelectronic properties, can surely enrich the green technology towards sustainability.
Sumita Goswami; Suman Nandy; Jonas Deuermeier; Ana C. Marques; Daniela Nunes; Shashikant P. Patole; Pedro M. F. J. Costa; Rodrigo Martins; Elvira Fortunato. Green Nanotechnology: Green Nanotechnology from Waste Carbon-Polyaniline Composite: Generation of Wavelength-Independent Multiband Photoluminescence for Sensitive Ion Detection (Adv. Sustainable Syst. 1/2018). Advanced Sustainable Systems 2018, 2, 1870002 .
AMA StyleSumita Goswami, Suman Nandy, Jonas Deuermeier, Ana C. Marques, Daniela Nunes, Shashikant P. Patole, Pedro M. F. J. Costa, Rodrigo Martins, Elvira Fortunato. Green Nanotechnology: Green Nanotechnology from Waste Carbon-Polyaniline Composite: Generation of Wavelength-Independent Multiband Photoluminescence for Sensitive Ion Detection (Adv. Sustainable Syst. 1/2018). Advanced Sustainable Systems. 2018; 2 (1):1870002.
Chicago/Turabian StyleSumita Goswami; Suman Nandy; Jonas Deuermeier; Ana C. Marques; Daniela Nunes; Shashikant P. Patole; Pedro M. F. J. Costa; Rodrigo Martins; Elvira Fortunato. 2018. "Green Nanotechnology: Green Nanotechnology from Waste Carbon-Polyaniline Composite: Generation of Wavelength-Independent Multiband Photoluminescence for Sensitive Ion Detection (Adv. Sustainable Syst. 1/2018)." Advanced Sustainable Systems 2, no. 1: 1870002.
This study reports on the qualitative analysis of photoluminescence effect generated from waste carbon of cooking oven by facile cost-effective material engineering. The waste carbon product as a form of carbon nanoparticles (CNPs) is incorporated within a conjugate polymer, namely, polyaniline (PANI) to produce CNP-PANI composites that have shown excitation-wavelength-independent triple-band photoluminescence emission effect and highly sensitive Fe+3 ion detection ability. Herein the waste carbon material, while functionalized within the conjugated polymer, needs no further acid treatment or surface modification thus making the process cheaper, environmentally benign, and useful for green nanotechnology. The excitation-wavelength-independent unique triple-band photoluminescence spectrum is the direct consequence of carbon–polyaniline synergy in π–π transition and the surface passivation of CNPs by the NH2 group rich aniline during in-situ polymerization. The current scenario has been studied for the samples prepared with different CNP concentrations for different reaction times and discussed in details with supportive physico-chemical characterizations. Moreover, the present study has demonstrated that the current material can be used as a fluorescent sensing platform for Fe+3 ions with high sensitivity and selectivity criteria where the detection limit of the sensing probe has a value as low as 12 × 10−9 nM.
Sumita Goswami; Suman Nandy; Jonas Deuermeier; Ana Marques; Daniela Nunes; Shashikant Patole; Pedro M. F. J. Costa; Rodrigo Martins; Elvira Fortunato. Green Nanotechnology from Waste Carbon-Polyaniline Composite: Generation of Wavelength-Independent Multiband Photoluminescence for Sensitive Ion Detection. Advanced Sustainable Systems 2017, 2, 1 .
AMA StyleSumita Goswami, Suman Nandy, Jonas Deuermeier, Ana Marques, Daniela Nunes, Shashikant Patole, Pedro M. F. J. Costa, Rodrigo Martins, Elvira Fortunato. Green Nanotechnology from Waste Carbon-Polyaniline Composite: Generation of Wavelength-Independent Multiband Photoluminescence for Sensitive Ion Detection. Advanced Sustainable Systems. 2017; 2 (1):1.
Chicago/Turabian StyleSumita Goswami; Suman Nandy; Jonas Deuermeier; Ana Marques; Daniela Nunes; Shashikant Patole; Pedro M. F. J. Costa; Rodrigo Martins; Elvira Fortunato. 2017. "Green Nanotechnology from Waste Carbon-Polyaniline Composite: Generation of Wavelength-Independent Multiband Photoluminescence for Sensitive Ion Detection." Advanced Sustainable Systems 2, no. 1: 1.
Next-generation electrical nanoimprinting of a polymeric data sheet based on charge trapping phenomena is reported here. Carbon nanoparticles (CNPs) (waste carbon product) are deployed into a polymeric matrix (polyaniline) (PANI) as a charge trapping layer. The data are recorded on the CNPs-filled polyaniline device layer by “electro-typing” under a voltage pulse (VET, from ±1 to ±7 V), which is applied to the device layer through a localized charge-injection method. The core idea of this device is to make an electrical image through the charge trapping mechanism, which can be “read” further by the subsequent electrical mapping. The density of stored charges at the carbon–polyaniline layer, near the metal/polymer interface, is found to depend on the voltage amplitude, i.e., the number of injected charge carriers. The relaxation of the stored charges is studied by different probe voltages and for different devices, depending on the percolation of the CNPs into the PANI. The polymeric data sheet retains the recorded data for more than 6 h, which can be refreshed or erased at will. Also, a write–read–erase–read cycle is performed for the smallest “bit” of stored information through a single contact between the probe and the device layer.
Sumita Goswami; Suman Nandy; Arghya Narayan Banerjee; Asal Kiazadeh; Gowra Raghupathy Dillip; Joana Vaz Pinto; Sang Woo Joo; Rodrigo Martins; Elvira Fortunato. “Electro-Typing” on a Carbon-Nanoparticles-Filled Polymeric Film using Conducting Atomic Force Microscopy. Advanced Materials 2017, 29, 1703079 .
AMA StyleSumita Goswami, Suman Nandy, Arghya Narayan Banerjee, Asal Kiazadeh, Gowra Raghupathy Dillip, Joana Vaz Pinto, Sang Woo Joo, Rodrigo Martins, Elvira Fortunato. “Electro-Typing” on a Carbon-Nanoparticles-Filled Polymeric Film using Conducting Atomic Force Microscopy. Advanced Materials. 2017; 29 (47):1703079.
Chicago/Turabian StyleSumita Goswami; Suman Nandy; Arghya Narayan Banerjee; Asal Kiazadeh; Gowra Raghupathy Dillip; Joana Vaz Pinto; Sang Woo Joo; Rodrigo Martins; Elvira Fortunato. 2017. "“Electro-Typing” on a Carbon-Nanoparticles-Filled Polymeric Film using Conducting Atomic Force Microscopy." Advanced Materials 29, no. 47: 1703079.
The electrorheological (ER) effect is known as the enhancement of the apparent viscosity upon application of an external electric field applied perpendicular to the flow direction. Suspensions of polarizable particles in non-conducting solvents are the most studied ER fluids. The increase in viscosity observed in the suspensions is due to the formation of columns that align with the electric field. This work presents the ER behavior of suspensions, in silicone oil, of camphorsulfonic acid (CSA) doped polyaniline (PANI) nanofibers. The ER properties of the suspensions were investigated with a rotational rheometer, to which an ER cell was coupled, in steady shear, and electrical field strengths up to 2 kV mm−1. The effects of the electric field strength, content of nanostructures and viscosity of the continuum phase, in the shear viscosity and yield stress, were investigated at room temperature. As expected, the ER effect increases with the increase of the electric field as well as with the increase of content of nanofibers and it decreases with the increase of the oil viscosity. The suspensions present giant ER effects (higher than 2 orders of magnitude increase in viscosity for low shear rates and high electric fields), showing their potential application as ER smart materials.
S Goswami; P Gonçalves; M T Cidade. Electrorheological behavior of suspensions of camphorsulfonic acid (CSA) doped polyaniline nanofibers in silicone oil. Physica Scripta 2017, 92, 075801 .
AMA StyleS Goswami, P Gonçalves, M T Cidade. Electrorheological behavior of suspensions of camphorsulfonic acid (CSA) doped polyaniline nanofibers in silicone oil. Physica Scripta. 2017; 92 (7):075801.
Chicago/Turabian StyleS Goswami; P Gonçalves; M T Cidade. 2017. "Electrorheological behavior of suspensions of camphorsulfonic acid (CSA) doped polyaniline nanofibers in silicone oil." Physica Scripta 92, no. 7: 075801.
Mechano-electrical writing and reading in polyaniline (PANI) thin film are demonstrated via metal-polymer contact electrification mechanism (CEM). An innovative conception for a non-destructive self-powered writable-readable data sheet is presented which can pave the way towards new type of stress induced current harvesting devices. A localized forced deformation of the interface has been enacted by pressing the atomic force microscopic probe against the polymer surface, allowing charge transfer between materials interfaces. The process yields a well-defined charge pattern by transmuting mechanical stress in to readable information. The average of output current increment has been influenced from 0.5 nA to 15 nA for the applied force of 2 nN to 14 nN instead of electrical bias. These results underscore the importance of stress-induced current harvesting mechanism and could be scaled up for charge patterning of polymer surface to writable-readable data sheet. Time evolutional current distribution (TECD) study of the stress-induced patterned PANI surface shows the response of readability of the recorded data with time.
Sumita Goswami; Suman Nandy; Tomás Calmeiro; Rui Igreja; Rodrigo Martins; Elvira Fortunato. Stress Induced Mechano-electrical Writing-Reading of Polymer Film Powered by Contact Electrification Mechanism. Scientific Reports 2016, 6, 19514 .
AMA StyleSumita Goswami, Suman Nandy, Tomás Calmeiro, Rui Igreja, Rodrigo Martins, Elvira Fortunato. Stress Induced Mechano-electrical Writing-Reading of Polymer Film Powered by Contact Electrification Mechanism. Scientific Reports. 2016; 6 (1):19514.
Chicago/Turabian StyleSumita Goswami; Suman Nandy; Tomás Calmeiro; Rui Igreja; Rodrigo Martins; Elvira Fortunato. 2016. "Stress Induced Mechano-electrical Writing-Reading of Polymer Film Powered by Contact Electrification Mechanism." Scientific Reports 6, no. 1: 19514.
Sumita Goswami; Tiago Brehm; Sergej Filonovich; Maria Teresa Cidade. Electrorheological properties of polyaniline-vanadium oxide nanostructures suspended in silicone oil. Smart Materials and Structures 2014, 23, 1 .
AMA StyleSumita Goswami, Tiago Brehm, Sergej Filonovich, Maria Teresa Cidade. Electrorheological properties of polyaniline-vanadium oxide nanostructures suspended in silicone oil. Smart Materials and Structures. 2014; 23 (10):1.
Chicago/Turabian StyleSumita Goswami; Tiago Brehm; Sergej Filonovich; Maria Teresa Cidade. 2014. "Electrorheological properties of polyaniline-vanadium oxide nanostructures suspended in silicone oil." Smart Materials and Structures 23, no. 10: 1.
S. Goswami; U.N. Maiti; Soumen Maiti; M.K. Mitra; K.K. Chattopadhyay. Polyaniline/Vanadium oxide composites: An effective control in morphology by varying reactant concentrations. Materials Chemistry and Physics 2013, 138, 319 -326.
AMA StyleS. Goswami, U.N. Maiti, Soumen Maiti, M.K. Mitra, K.K. Chattopadhyay. Polyaniline/Vanadium oxide composites: An effective control in morphology by varying reactant concentrations. Materials Chemistry and Physics. 2013; 138 (1):319-326.
Chicago/Turabian StyleS. Goswami; U.N. Maiti; Soumen Maiti; M.K. Mitra; K.K. Chattopadhyay. 2013. "Polyaniline/Vanadium oxide composites: An effective control in morphology by varying reactant concentrations." Materials Chemistry and Physics 138, no. 1: 319-326.
Amorphous carbon nanotubes-polyaniline composite have been synthesized by simple chemical procedure. It has been found from the field emission scanning electron microscopy and transmission electron microscopy that amorphous carbon nanotubes are coated with the polyaniline. As synthesized polyaniline coated amorphous carbon nanotubes showed improve field emission property with a turn-on field as low 2.77 V/ μm.
S. Maity; Sumita Goswami; K. K. Chattopadhyay. Enhanced field emission from polyaniline coated amorphous carbon nanotubes. PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013 2013, 607 -608.
AMA StyleS. Maity, Sumita Goswami, K. K. Chattopadhyay. Enhanced field emission from polyaniline coated amorphous carbon nanotubes. PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. 2013; ():607-608.
Chicago/Turabian StyleS. Maity; Sumita Goswami; K. K. Chattopadhyay. 2013. "Enhanced field emission from polyaniline coated amorphous carbon nanotubes." PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013 , no. : 607-608.
The general challenge to improve the field emission properties of conducting polymers depends on the fabrication of novel nanostructures from their polymeric aggregates and/or the synthesis of novel nanocomposites. Here we report amorphous carbon nanotube (aCNT)–polyaniline (PANI) core–shell hierarchical structures for the first time, which exhibit high field emission properties. The aCNT–PANI hierarchical nanostructures were prepared using a facile and cost effective method, which involved a simple in situ oxidative polymerization of aniline in the presence of aCNTs at three different temperatures. The as-synthesized samples were characterized using X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy and Raman spectroscopy. The field emission characteristics of the pristine aCNT sample were compared with the composites synthesized at different temperatures. The turn-on fields of the aCNT–PANI composites in comparison with the pristine aCNTs decreased from 9.13 to 2.57 V μm−1 and the emission current density increased from 0.031 to 1.27 mA cm−2 at an electric field of 11.50 V μm−1. The improvement in the field emission properties of the aCNT–PANI composites can be explained in terms of both a higher enhancement factor and a lower work function of the composite. This research gives a new perception towards the radical improvement of field emission properties of conducting polymers, based on unique hierarchical core–shell nanostructures.
Supratim Maity; Sumita Goswami; Kalyan Kumar Chattopadhyay. Amorphous carbon nanotube–polyaniline core–shell nanostructures for efficient cold cathode applications. RSC Advances 2013, 3, 26321 .
AMA StyleSupratim Maity, Sumita Goswami, Kalyan Kumar Chattopadhyay. Amorphous carbon nanotube–polyaniline core–shell nanostructures for efficient cold cathode applications. RSC Advances. 2013; 3 (48):26321.
Chicago/Turabian StyleSupratim Maity; Sumita Goswami; Kalyan Kumar Chattopadhyay. 2013. "Amorphous carbon nanotube–polyaniline core–shell nanostructures for efficient cold cathode applications." RSC Advances 3, no. 48: 26321.
Graphene–polyaniline composites have been synthesized using simple chemical procedure in two different ways (i) by mixing of the pre-synthesized graphene and polyaniline nanofibers and (ii) by in situ polymerization in presence of graphite oxide followed by further reduction. Detailed optical spectroscopic studies of the synthesized composites along with the pristine polyaniline nanofibers were performed by Fourier transformed infrared spectroscopy and UV–vis spectroscopy. The structural and morphological characterizations were performed by X-ray diffraction, transmission electron microscope measurements and field emission scanning electron microscope measurements, respectively while the chemical characters were studied by X-ray photoelectron spectroscopic measurement. The graphene–polyaniline composite retained the photoluminescence property of the as synthesized polyaniline nanofibers. The electron field emission property of the composite showed marked improvement compared to pristine polyaniline fibers with a turn-on field as low as 3.91 V/μm at a current density of 1 μA/cm2. The field enhancement factor was found to be 7012 which is much higher for the case of a polymer based composite.
Sumita Goswami; U.N. Maiti; Soumen Maiti; Suman Nandy; M.K. Mitra; K.K. Chattopadhyay. Preparation of graphene–polyaniline composites by simple chemical procedure and its improved field emission properties. Carbon 2011, 49, 2245 -2252.
AMA StyleSumita Goswami, U.N. Maiti, Soumen Maiti, Suman Nandy, M.K. Mitra, K.K. Chattopadhyay. Preparation of graphene–polyaniline composites by simple chemical procedure and its improved field emission properties. Carbon. 2011; 49 (7):2245-2252.
Chicago/Turabian StyleSumita Goswami; U.N. Maiti; Soumen Maiti; Suman Nandy; M.K. Mitra; K.K. Chattopadhyay. 2011. "Preparation of graphene–polyaniline composites by simple chemical procedure and its improved field emission properties." Carbon 49, no. 7: 2245-2252.
Synthesis of large scale arrays of ZnO nanospikes with ultra sharp tips (<10 nm) is achieved through a newly developed chemical methodology. This is the first room temperature report of growing 1D ZnO nanostructures on heterogeneous substrates. The deposition was performed on various substrates including planar (silicon, conducting glass, copper foil), cylindrical (metallic wire) and flexible carbon cloth. The deposition technique is a universal one in the sense that it is compatible with complex shape substrates as well as independent of the nature of the substrate material. The arrangement of the nanospikes over the substrates may be altered from a dense array to a distributed flower like structure depending on the substrate pretreatment. The nanospikes exhibit excellent field emission performance caused by their emission beneficial geometry with turn-on and threshold fields showing significant dependence on the growth substrate. The turn-on field and the field enhancement factor are found to be the lowest and the highest for the ZnO deposited on carbon cloth substrates having values of 0.7 V μm−1 and 2.6 × 104 respectively. These are the best values compared to all reported chemically synthesized ZnO nanostructures and comparable to the best results of vapor phase deposited ZnO nanostructures. The synthesis method reported here will open-up a new door for future development of nano-based flexible electronics.
Uday N. Maiti; Soumen Maiti; Sumita Goswami; Debabrtata Sarkar; Kalyan K. Chattopadhyay. Room temperature deposition of ultra sharp ZnO nanospike arrays on metallic, non-metallic and flexible carbon fabrics: Efficient field emitters. CrystEngComm 2011, 13, 1976 -1983.
AMA StyleUday N. Maiti, Soumen Maiti, Sumita Goswami, Debabrtata Sarkar, Kalyan K. Chattopadhyay. Room temperature deposition of ultra sharp ZnO nanospike arrays on metallic, non-metallic and flexible carbon fabrics: Efficient field emitters. CrystEngComm. 2011; 13 (6):1976-1983.
Chicago/Turabian StyleUday N. Maiti; Soumen Maiti; Sumita Goswami; Debabrtata Sarkar; Kalyan K. Chattopadhyay. 2011. "Room temperature deposition of ultra sharp ZnO nanospike arrays on metallic, non-metallic and flexible carbon fabrics: Efficient field emitters." CrystEngComm 13, no. 6: 1976-1983.
Nanocrystalline AlN thin films were prepared via DC sputtering technique at different substrate temperature. The crystal orientation and particle size of aluminum nitride thin films were investigated by XRD analysis. Study indicated that the sample contained pure phase hexagonal AlN nanoparticles with a single peak corresponding to the (100) planes. The peak at 665 cm−1 in the FTIR spectrum of film was assigned to the LO phonon of hexagonal AlN. The particle size of the film, prepared at substrate temperature 200°C was about 9.5 nm, as investigated by atomic force microscope. Field emission study indicated that it can be used as a good field emitter. Turn-on field (Eto) of 15.02 V/μm was observed for the AlN films synthesized at substrate temperature 200°C. Dielectric constant of the AlN film was found nearly independent of frequencies in the measured frequency range 1 KHz to 1 MHz, i.e. in the audio frequency range. The values of dielectric constant (ε) were 10.07, 9.46 and 8.65 for the film prepared at 70°C, 150°C and 200°C, respectively, at frequency 1 KHz.
Ranjit Thapa; Biswajit Saha; S. Goswami; K. K. Chattopadhyay. Study of field emission and dielectric properties of AlN films prepared by DC sputtering technique at different substrate temperatures. Indian Journal of Physics 2010, 84, 1347 -1354.
AMA StyleRanjit Thapa, Biswajit Saha, S. Goswami, K. K. Chattopadhyay. Study of field emission and dielectric properties of AlN films prepared by DC sputtering technique at different substrate temperatures. Indian Journal of Physics. 2010; 84 (10):1347-1354.
Chicago/Turabian StyleRanjit Thapa; Biswajit Saha; S. Goswami; K. K. Chattopadhyay. 2010. "Study of field emission and dielectric properties of AlN films prepared by DC sputtering technique at different substrate temperatures." Indian Journal of Physics 84, no. 10: 1347-1354.
S. Nandy; S. Goswami; K.K. Chattopadhyay. Ultra smooth NiO thin films on flexible plastic (PET) substrate at room temperature by RF magnetron sputtering and effect of oxygen partial pressure on their properties. Applied Surface Science 2010, 256, 3142 -3147.
AMA StyleS. Nandy, S. Goswami, K.K. Chattopadhyay. Ultra smooth NiO thin films on flexible plastic (PET) substrate at room temperature by RF magnetron sputtering and effect of oxygen partial pressure on their properties. Applied Surface Science. 2010; 256 (10):3142-3147.
Chicago/Turabian StyleS. Nandy; S. Goswami; K.K. Chattopadhyay. 2010. "Ultra smooth NiO thin films on flexible plastic (PET) substrate at room temperature by RF magnetron sputtering and effect of oxygen partial pressure on their properties." Applied Surface Science 256, no. 10: 3142-3147.
Conducting polyaniline (PANI) nano-porous film synthesized on PET substrate by vapor deposition technique has shown excellent field emission behaviour and the emission was further enhanced by conditioning with vacuum electric discharge. Detailed study on the field emission for PANI films synthesized with different oxidant concentration was performed. Measurement was also carried out for different anode-sample separation. Turn-on field as low as 0.5 V/μm and emission current density as high as 20.96 mA/cm2 was observed. The field enhancement factors were found to be in the range of 1192–3782. The films were characterized with X-ray diffraction, UV–vis spectroscopy, Fourier transformed infrared spectroscopy, scanning electron microscopy and also atomic force microscopy. The synthesized PANI films may be a promising material for field emission devices and also for plastic display industry.
S. Goswami; M.K. Mitra; K.K. Chattopadhyay. Enhanced field emission from polyaniline nano-porous thin films on PET substrate. Synthetic Metals 2009, 159, 2430 -2436.
AMA StyleS. Goswami, M.K. Mitra, K.K. Chattopadhyay. Enhanced field emission from polyaniline nano-porous thin films on PET substrate. Synthetic Metals. 2009; 159 (23-24):2430-2436.
Chicago/Turabian StyleS. Goswami; M.K. Mitra; K.K. Chattopadhyay. 2009. "Enhanced field emission from polyaniline nano-porous thin films on PET substrate." Synthetic Metals 159, no. 23-24: 2430-2436.
S. Jana; S. Goswami; S. Nandy; K.K. Chattopadhyay. Synthesis of tetrapod like PbS microcrystals by hydrothermal route and its optical characterization. Journal of Alloys and Compounds 2009, 481, 806 -810.
AMA StyleS. Jana, S. Goswami, S. Nandy, K.K. Chattopadhyay. Synthesis of tetrapod like PbS microcrystals by hydrothermal route and its optical characterization. Journal of Alloys and Compounds. 2009; 481 (1-2):806-810.
Chicago/Turabian StyleS. Jana; S. Goswami; S. Nandy; K.K. Chattopadhyay. 2009. "Synthesis of tetrapod like PbS microcrystals by hydrothermal route and its optical characterization." Journal of Alloys and Compounds 481, no. 1-2: 806-810.