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The knowledge of how the different types of nitrogen centers affect the electrochemical and optical properties of Nitrogen-doped carbon quantum dots (N-CDs) is of paramount importance in the design and synthesis of these nanostructures. In fact, from the knowledge of the redox centers of N-CDs it is possible tune their energetic levels in order to realize the suitable matches for the design of opto-electronic, photovoltaic or catalytic devices. Herein we present a study of the electrochemical and the optical responses of N-CDs, obtained by hydrothermal method from citric acid and urea. The main issue is to investigate the role played by the specific nitrogen centers in their redox processes. From the voltammetric responses we showed that the observed oxidation processes of N-CDs involve their graphitic and pyrrolic N-atoms, respectively, while the reduction process regards their protonated pyridinic N-atoms. Then, from spectro-electrochemical determinations, we explained that the oxidation of the graphitic N-atoms is a two electron process that gives an N-oxide form through the reaction with a molecule of water and the loss of two protons. Finally we discussed the observed pH-dependence of both the optical and the electrochemical responses of our N-CDs to explain the role played by their pyridinic N-atoms.
Barbara Vercelli; Riccardo Donnini; Francesco Ghezzi; Antonio Sansonetti; Umberto Giovanella; Barbara La Ferla. Nitrogen-doped carbon quantum dots obtained hydrothermally from citric acid and urea: The role of the specific nitrogen centers in their electrochemical and optical responses. Electrochimica Acta 2021, 387, 138557 .
AMA StyleBarbara Vercelli, Riccardo Donnini, Francesco Ghezzi, Antonio Sansonetti, Umberto Giovanella, Barbara La Ferla. Nitrogen-doped carbon quantum dots obtained hydrothermally from citric acid and urea: The role of the specific nitrogen centers in their electrochemical and optical responses. Electrochimica Acta. 2021; 387 ():138557.
Chicago/Turabian StyleBarbara Vercelli; Riccardo Donnini; Francesco Ghezzi; Antonio Sansonetti; Umberto Giovanella; Barbara La Ferla. 2021. "Nitrogen-doped carbon quantum dots obtained hydrothermally from citric acid and urea: The role of the specific nitrogen centers in their electrochemical and optical responses." Electrochimica Acta 387, no. : 138557.
Carbon quantum dots (CDs) are a new class of fluorescent carbonaceous nanomaterials that were casually discovered in 2004. Since then, they have become object of great interest in the scientific community because of their peculiar optical properties (e.g., size-dependent and excitation wavelength-dependent fluorescence), which make them very similar to the well-known semiconductor quantum dots and suitable for application in photovoltaic devices (PVs). In fact, with appropriate structural engineering, it is possible to modulate CDs photoluminescence properties, band gap, and energy levels in order to realize the band matching suitable to enable the desired directional flow of charge carriers within the PV device architecture in which they are implanted. Considering the latest developments, in the present short review, the employment of CDs in organic photovoltaic devices (OPVs) will be summarized, in order to study the role played by these nanomaterials in the improvement of the performances of the devices. After a first brief summary of the strategies of structural engineering of CDs and the effects on their optical properties, the attention will be devoted to the recent highlights of CDs application in organic solar cells (OSCs) and in dye sensitized solar cells (DSSCs), in order to guide the users towards the full exploitation of the use of these nanomaterials in such OPV devices.
Barbara Vercelli. The Role of Carbon Quantum Dots in Organic Photovoltaics: A Short Overview. Coatings 2021, 11, 232 .
AMA StyleBarbara Vercelli. The Role of Carbon Quantum Dots in Organic Photovoltaics: A Short Overview. Coatings. 2021; 11 (2):232.
Chicago/Turabian StyleBarbara Vercelli. 2021. "The Role of Carbon Quantum Dots in Organic Photovoltaics: A Short Overview." Coatings 11, no. 2: 232.
Conjugated polymers with ionic pendant groups (CPEs) are receiving increasing attention as solution-processed interfacial materials for organic solar cells (OSCs). Various anionic CPEs have been successfully used, on top of ITO (Indium Tin Oxide) electrodes, as solution-processed anode interlayers (AILs) for conventional devices with direct geometry. However, the development of CPE AILs for OSC devices with inverted geometry is an important topic that still needs to be addressed. Here, we have designed three anionic CPEs bearing alkyl-potassium-sulfonate side chains. Their functional behavior as anode interlayers has been investigated in P3HT:PC61BM (poly(3-hexylthiophene): [6,6]-phenyl C61 butyric acid methyl ester) devices with an inverted geometry, using a hole collecting silver electrode evaporated on top. Our results reveal that to obtain effective anode modification, the CPEs’ conjugated backbone has to be tailored to grant self-doping and to have a good energy-level match with the photoactive layer. Furthermore, the sulfonate moieties not only ensure the solubility in polar orthogonal solvents, induce self-doping via a right choice of the conjugated backbone, but also play a role in the gaining of hole selectivity of the top silver electrode.
Elisa Lassi; Benedetta Squeo; Roberto Sorrentino; Guido Scavia; Simona Mrakic-Sposta; Maristella Gussoni; Barbara Vercelli; Francesco Galeotti; Mariacecilia Pasini; Silvia Luzzati. Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells. Molecules 2021, 26, 763 .
AMA StyleElisa Lassi, Benedetta Squeo, Roberto Sorrentino, Guido Scavia, Simona Mrakic-Sposta, Maristella Gussoni, Barbara Vercelli, Francesco Galeotti, Mariacecilia Pasini, Silvia Luzzati. Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells. Molecules. 2021; 26 (3):763.
Chicago/Turabian StyleElisa Lassi; Benedetta Squeo; Roberto Sorrentino; Guido Scavia; Simona Mrakic-Sposta; Maristella Gussoni; Barbara Vercelli; Francesco Galeotti; Mariacecilia Pasini; Silvia Luzzati. 2021. "Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells." Molecules 26, no. 3: 763.
Voltammetric analyses of two anticancer molecules at modified electrodes and influence of aggregate formation on their differential pulse voltammetry (DPV) responses.
Barbara Vercelli; Sara Crotti; Marco Agostini. Voltammetric responses at modified electrodes and aggregation effects of two anticancer molecules: irinotecan and sunitinib. New Journal of Chemistry 2020, 44, 18233 -18241.
AMA StyleBarbara Vercelli, Sara Crotti, Marco Agostini. Voltammetric responses at modified electrodes and aggregation effects of two anticancer molecules: irinotecan and sunitinib. New Journal of Chemistry. 2020; 44 (42):18233-18241.
Chicago/Turabian StyleBarbara Vercelli; Sara Crotti; Marco Agostini. 2020. "Voltammetric responses at modified electrodes and aggregation effects of two anticancer molecules: irinotecan and sunitinib." New Journal of Chemistry 44, no. 42: 18233-18241.
Multilayers of sulphur-based anchoring group linkers and CdSe nanocrystals (NCs) were realized on ITO substrate via layer-by-layer alternation. The materials were investigated by UV-vis and FTIR spectroscopy, photoluminescence and photoconductivity. We found that the change of NCs packing during the multilayers build-up produces a progressive increase of exciton delocalization. In fact during multilayer deposition the NCs first excitonic peak shifts progressively towards longer wavelengths. We found a linear relation between the optical bang gap shift ("" E_gn) and the inverse of number of CdSe-NCs layers ( n ) for n > 2, in particular the decrease of its value for the infinite multilayer from the one of the solution (2.10 eV) goes from 18 meV for the 1,2-ethylene-bis(dithiocarbamate) (EDTC) linker to 66 meV for sulphide dianions, corresponding to an apparent increase of the exciton radius of 0.20 nm and 0.85nm respectively.
Barbara Vercelli; Tersilla Virgili; Mariacecilia Pasini; Anna Berlin; Gianni Zotti. Multilayers of Carbodithioate and Sulfide-Linked CdSe Nanocrystals: Progressive Increase of Exciton Delocalization. The Journal of Physical Chemistry C 2019, 123, 23159 -23166.
AMA StyleBarbara Vercelli, Tersilla Virgili, Mariacecilia Pasini, Anna Berlin, Gianni Zotti. Multilayers of Carbodithioate and Sulfide-Linked CdSe Nanocrystals: Progressive Increase of Exciton Delocalization. The Journal of Physical Chemistry C. 2019; 123 (37):23159-23166.
Chicago/Turabian StyleBarbara Vercelli; Tersilla Virgili; Mariacecilia Pasini; Anna Berlin; Gianni Zotti. 2019. "Multilayers of Carbodithioate and Sulfide-Linked CdSe Nanocrystals: Progressive Increase of Exciton Delocalization." The Journal of Physical Chemistry C 123, no. 37: 23159-23166.
Gianni Zotti; Anna Berlin; Barbara Vercelli. Electrochemistry of conjugated planar anticancer molecules: Irinotecan and Sunitinib. Electrochimica Acta 2017, 231, 336 -343.
AMA StyleGianni Zotti, Anna Berlin, Barbara Vercelli. Electrochemistry of conjugated planar anticancer molecules: Irinotecan and Sunitinib. Electrochimica Acta. 2017; 231 ():336-343.
Chicago/Turabian StyleGianni Zotti; Anna Berlin; Barbara Vercelli. 2017. "Electrochemistry of conjugated planar anticancer molecules: Irinotecan and Sunitinib." Electrochimica Acta 231, no. : 336-343.
Mariacecilia Pasini; Barbara Vercelli; Gianni Zotti; Anna Berlin. Solid-state Effects in the Cyclovoltammetric HOMO-LUMO Determination: The case of Dinitrophenyl-hydrazone α,Ͽ-substituted Oligothiophenes. Electrochimica Acta 2016, 193, 261 -267.
AMA StyleMariacecilia Pasini, Barbara Vercelli, Gianni Zotti, Anna Berlin. Solid-state Effects in the Cyclovoltammetric HOMO-LUMO Determination: The case of Dinitrophenyl-hydrazone α,Ͽ-substituted Oligothiophenes. Electrochimica Acta. 2016; 193 ():261-267.
Chicago/Turabian StyleMariacecilia Pasini; Barbara Vercelli; Gianni Zotti; Anna Berlin. 2016. "Solid-state Effects in the Cyclovoltammetric HOMO-LUMO Determination: The case of Dinitrophenyl-hydrazone α,Ͽ-substituted Oligothiophenes." Electrochimica Acta 193, no. : 261-267.
Barbara Vercelli; Giuliano Angella; Tersilla Virgili; I. Suárez López; Mariacecilia Pasini. Photo-Physical Behaviour of CdSe Nanocrystals/Bis(dithiocarbamate) Linker Multilayered Hybrid Systems. Journal of Nanoscience and Nanotechnology 2015, 15, 3540 -3544.
AMA StyleBarbara Vercelli, Giuliano Angella, Tersilla Virgili, I. Suárez López, Mariacecilia Pasini. Photo-Physical Behaviour of CdSe Nanocrystals/Bis(dithiocarbamate) Linker Multilayered Hybrid Systems. Journal of Nanoscience and Nanotechnology. 2015; 15 (5):3540-3544.
Chicago/Turabian StyleBarbara Vercelli; Giuliano Angella; Tersilla Virgili; I. Suárez López; Mariacecilia Pasini. 2015. "Photo-Physical Behaviour of CdSe Nanocrystals/Bis(dithiocarbamate) Linker Multilayered Hybrid Systems." Journal of Nanoscience and Nanotechnology 15, no. 5: 3540-3544.
Barbara Vercelli; Mariacecilia Pasini; Anna Berlin; Juan Casado; Juan Teodomiro López Navarrete; Rocío Ponce Ortiz; Gianni Zotti. Phenyl- and Thienyl-Ended Symmetric Azomethines and Azines as Model Compounds for n-Channel Organic Field-Effect Transistors: An Electrochemical and Computational Study. The Journal of Physical Chemistry C 2014, 118, 3984 -3993.
AMA StyleBarbara Vercelli, Mariacecilia Pasini, Anna Berlin, Juan Casado, Juan Teodomiro López Navarrete, Rocío Ponce Ortiz, Gianni Zotti. Phenyl- and Thienyl-Ended Symmetric Azomethines and Azines as Model Compounds for n-Channel Organic Field-Effect Transistors: An Electrochemical and Computational Study. The Journal of Physical Chemistry C. 2014; 118 (8):3984-3993.
Chicago/Turabian StyleBarbara Vercelli; Mariacecilia Pasini; Anna Berlin; Juan Casado; Juan Teodomiro López Navarrete; Rocío Ponce Ortiz; Gianni Zotti. 2014. "Phenyl- and Thienyl-Ended Symmetric Azomethines and Azines as Model Compounds for n-Channel Organic Field-Effect Transistors: An Electrochemical and Computational Study." The Journal of Physical Chemistry C 118, no. 8: 3984-3993.
Arrigo Calzolari; Barbara Vercelli; Alice Ruini; Tersilla Virgili; Mariacecilia Pasini. Fluorine-Induced Enhancement of the Oxidation Stability and Deep-Blue Optical Activity in Conductive Polyfluorene Derivatives. The Journal of Physical Chemistry C 2013, 117, 26760 -26767.
AMA StyleArrigo Calzolari, Barbara Vercelli, Alice Ruini, Tersilla Virgili, Mariacecilia Pasini. Fluorine-Induced Enhancement of the Oxidation Stability and Deep-Blue Optical Activity in Conductive Polyfluorene Derivatives. The Journal of Physical Chemistry C. 2013; 117 (50):26760-26767.
Chicago/Turabian StyleArrigo Calzolari; Barbara Vercelli; Alice Ruini; Tersilla Virgili; Mariacecilia Pasini. 2013. "Fluorine-Induced Enhancement of the Oxidation Stability and Deep-Blue Optical Activity in Conductive Polyfluorene Derivatives." The Journal of Physical Chemistry C 117, no. 50: 26760-26767.
We present a joint experimental and theoretical study of the early stage dynamics of photoexcited charges in a prototypical organic/inorganic interface. By using femtosecond pump–probe experiments we compared the photophysic of a layer-by-layer hybrid structure obtained by alternating CdSe nanocrystals and poly(p-styrenesulphonic acid) and the same CdSe nanocrystals capped with hexadecylamine and stearic acid diluted in solutions. While in the LBL structure it is clear the appearance of a long-lived charged state, no evidence of this is instead found in the diluted solutions. Density functional calculations indicate that these states are localized close to the nanoparticle surface, and that electrons and holes are separated across the hybrid interface, pointing out the effects of surfactant capping molecules on the optoelectronic properties of the interface. Our combined approach, allowing for unique access to the photoexcited electronic structure, opens the possibility to the fine tailoring of hybrid organic/semiconducting layers for photovoltaic applications.
Tersilla Virgili; Arrigo Calzolari; Inmaculada Suárez López; Barbara Vercelli; Gianni Zotti; Alessandra Catellani; Alice Ruini; Francesco Tassone. Charge Separation in the Hybrid CdSe Nanocrystal–Organic Interface: Role of the Ligands Studied by Ultrafast Spectroscopy and Density Functional Theory. The Journal of Physical Chemistry C 2013, 117, 5969 -5974.
AMA StyleTersilla Virgili, Arrigo Calzolari, Inmaculada Suárez López, Barbara Vercelli, Gianni Zotti, Alessandra Catellani, Alice Ruini, Francesco Tassone. Charge Separation in the Hybrid CdSe Nanocrystal–Organic Interface: Role of the Ligands Studied by Ultrafast Spectroscopy and Density Functional Theory. The Journal of Physical Chemistry C. 2013; 117 (11):5969-5974.
Chicago/Turabian StyleTersilla Virgili; Arrigo Calzolari; Inmaculada Suárez López; Barbara Vercelli; Gianni Zotti; Alessandra Catellani; Alice Ruini; Francesco Tassone. 2013. "Charge Separation in the Hybrid CdSe Nanocrystal–Organic Interface: Role of the Ligands Studied by Ultrafast Spectroscopy and Density Functional Theory." The Journal of Physical Chemistry C 117, no. 11: 5969-5974.
The fluorinated phenylene unit is used as a building block for an all-conjugated fluorene-based alternating copolymer (PFO–TFP). The synthesis, carried out by an optimized Suzuki cross-coupling, produces an extremely high purity compound with a series of intriguing properties. Firstly, a blue-shift of the absorption and emission spectra with respect to the parent polymer is achieved. Secondly, the photoluminescence (PL) quantum yields (QYs) of the solution, as high as 68%, are surprisingly retained in the solid-state. Finally, an improved colour stability of the film with respect to unsubstituted polymers, investigated by means of cyclic voltammetry and exposure to ultraviolet radiation, is observed. The PFO–TFP tested as an undoped active layer in a polymer light-emitting diode (PLED) shows a highly desirable pure deep blue 405 nm electroluminescence, CIE = (0.17; 0.06) and a remarkable 5.03% external quantum efficiency, thus fulfilling the requirements for both full-colour displays and biomedical applications. To date, fluorine atom incorporation has been successfully employed in the synthesis of high-performing polymers for organic field-effect transistors and photovoltaics. We give the first unambiguous proof of its efficacy in achieving pure deep blue electroluminescence in a highly efficient and stable PLED, which is competitive with the best reported conjugated oligomer-based devices.
Umberto Giovanella; Chiara Botta; Francesco Galeotti; Barbara Vercelli; Salvatore Battiato; Mariacecilia Pasini. Perfluorinated polymer with unexpectedly efficient deep blue electroluminescence for full-colour OLED displays and light therapy applications. Journal of Materials Chemistry C 2013, 1, 5322 -5329.
AMA StyleUmberto Giovanella, Chiara Botta, Francesco Galeotti, Barbara Vercelli, Salvatore Battiato, Mariacecilia Pasini. Perfluorinated polymer with unexpectedly efficient deep blue electroluminescence for full-colour OLED displays and light therapy applications. Journal of Materials Chemistry C. 2013; 1 (34):5322-5329.
Chicago/Turabian StyleUmberto Giovanella; Chiara Botta; Francesco Galeotti; Barbara Vercelli; Salvatore Battiato; Mariacecilia Pasini. 2013. "Perfluorinated polymer with unexpectedly efficient deep blue electroluminescence for full-colour OLED displays and light therapy applications." Journal of Materials Chemistry C 1, no. 34: 5322-5329.
G. Zotti; Barbara Vercelli; A. Berlin; Tersilla Virgili. Multilayers of CdSe Nanocrystals and Bis(dithiocarbamate) Linkers Displaying Record Photoconduction. The Journal of Physical Chemistry C 2012, 116, 25689 -25693.
AMA StyleG. Zotti, Barbara Vercelli, A. Berlin, Tersilla Virgili. Multilayers of CdSe Nanocrystals and Bis(dithiocarbamate) Linkers Displaying Record Photoconduction. The Journal of Physical Chemistry C. 2012; 116 (49):25689-25693.
Chicago/Turabian StyleG. Zotti; Barbara Vercelli; A. Berlin; Tersilla Virgili. 2012. "Multilayers of CdSe Nanocrystals and Bis(dithiocarbamate) Linkers Displaying Record Photoconduction." The Journal of Physical Chemistry C 116, no. 49: 25689-25693.
Tersilla Virgili; Inmaculada Suárez López; Barbara Vercelli; Giuliano Angella; Gianni Zotti; Juan Cabanillas-Gonzalez; Daniel Granados; Larry Lüer; Reinhold Wannemacher; Francesco Tassone. Spectroscopic Signature of Trap States in Assembled CdSe Nanocrystal Hybrid Films. The Journal of Physical Chemistry C 2012, 116, 16259 -16263.
AMA StyleTersilla Virgili, Inmaculada Suárez López, Barbara Vercelli, Giuliano Angella, Gianni Zotti, Juan Cabanillas-Gonzalez, Daniel Granados, Larry Lüer, Reinhold Wannemacher, Francesco Tassone. Spectroscopic Signature of Trap States in Assembled CdSe Nanocrystal Hybrid Films. The Journal of Physical Chemistry C. 2012; 116 (30):16259-16263.
Chicago/Turabian StyleTersilla Virgili; Inmaculada Suárez López; Barbara Vercelli; Giuliano Angella; Gianni Zotti; Juan Cabanillas-Gonzalez; Daniel Granados; Larry Lüer; Reinhold Wannemacher; Francesco Tassone. 2012. "Spectroscopic Signature of Trap States in Assembled CdSe Nanocrystal Hybrid Films." The Journal of Physical Chemistry C 116, no. 30: 16259-16263.
Mono- and multilayers from CdSe nanocrystal dispersion and perylene tetracarboxylate solution are reported for the first time. The layers were investigated by UV-visible spectroscopy, cyclic voltammetry, photoconductivity, and photoelectrochemical techniques. The n-type organic semiconductor gives enhanced photoconductivity to the CdSe-NC multilayer structure. The photoactive perylene monolayer acts also as hypersensitizer of CdSe-NC structures. The perylene-modified CdSe-NC monolayer on indium tin oxide (ITO) electrode in a three-electrode photoelectrochemical cell upon illumination in the presence of oxygen generates an intense steady photocurrent as high as 10-20 times that expected from the individual contributions of perylene and CdSe-NCs. The hypersensitization mechanism is discussed on the basis of the energy level diagram of the components.
Barbara Vercelli; G. Zotti; A. Berlin. Alternate Monolayers of CdSe Nanocrystals and Perylene Tetracarboxylate: Quantum Dot Hypersensitization for Dye-Sensitized Solar Cells. ACS Applied Materials & Interfaces 2012, 4, 3233 -3238.
AMA StyleBarbara Vercelli, G. Zotti, A. Berlin. Alternate Monolayers of CdSe Nanocrystals and Perylene Tetracarboxylate: Quantum Dot Hypersensitization for Dye-Sensitized Solar Cells. ACS Applied Materials & Interfaces. 2012; 4 (6):3233-3238.
Chicago/Turabian StyleBarbara Vercelli; G. Zotti; A. Berlin. 2012. "Alternate Monolayers of CdSe Nanocrystals and Perylene Tetracarboxylate: Quantum Dot Hypersensitization for Dye-Sensitized Solar Cells." ACS Applied Materials & Interfaces 4, no. 6: 3233-3238.
Barbara Vercelli; G. Zotti; A. Berlin; Mariacecilia Pasini; C. Botta; Rosalba Gerbasi; T. L. Nelson; R. D. McCullough. Oligo(poly)thiophene Sensitization of CdSe Nanocrystal and TiO2Polycrystalline Electrodes: A Photoelectrochemical Investigation. The Journal of Physical Chemistry C 2012, 116, 2033 -2039.
AMA StyleBarbara Vercelli, G. Zotti, A. Berlin, Mariacecilia Pasini, C. Botta, Rosalba Gerbasi, T. L. Nelson, R. D. McCullough. Oligo(poly)thiophene Sensitization of CdSe Nanocrystal and TiO2Polycrystalline Electrodes: A Photoelectrochemical Investigation. The Journal of Physical Chemistry C. 2012; 116 (2):2033-2039.
Chicago/Turabian StyleBarbara Vercelli; G. Zotti; A. Berlin; Mariacecilia Pasini; C. Botta; Rosalba Gerbasi; T. L. Nelson; R. D. McCullough. 2012. "Oligo(poly)thiophene Sensitization of CdSe Nanocrystal and TiO2Polycrystalline Electrodes: A Photoelectrochemical Investigation." The Journal of Physical Chemistry C 116, no. 2: 2033-2039.
Barbara Vercelli; G. Zotti; A. Berlin. Self-Assembled Multilayers of CdSe Nanocrystals and Hydrazine or Linear Diamines. The Journal of Physical Chemistry C 2011, 115, 4476 -4482.
AMA StyleBarbara Vercelli, G. Zotti, A. Berlin. Self-Assembled Multilayers of CdSe Nanocrystals and Hydrazine or Linear Diamines. The Journal of Physical Chemistry C. 2011; 115 (11):4476-4482.
Chicago/Turabian StyleBarbara Vercelli; G. Zotti; A. Berlin. 2011. "Self-Assembled Multilayers of CdSe Nanocrystals and Hydrazine or Linear Diamines." The Journal of Physical Chemistry C 115, no. 11: 4476-4482.
We have investigated the impact of the functionalization and the chemical nature of counterions on the π-dimer dications formation in two end-capped heptathienoacenes. Radical cations of an α-substituted heptathienoacene with triisopropylsilyl groups do not π-dimerize, while those of an α,β-substituted hepta
Cristina Capel Ferrón; María Del Carmen Ruiz Delgado; Juan Teodomiro López Navarrete; Barbara Vercelli; Marçal Capdevila Cortada; Weijun Niu; Mingqian He; Víctor Hernández; Gianni Zotti; Juan J. Novoa; František Hartl. Substituent and counterion effects on the formation of π-dimer dications of end-capped heptathienoacenes. Chemical Communications 2011, 47, 12622 -12624.
AMA StyleCristina Capel Ferrón, María Del Carmen Ruiz Delgado, Juan Teodomiro López Navarrete, Barbara Vercelli, Marçal Capdevila Cortada, Weijun Niu, Mingqian He, Víctor Hernández, Gianni Zotti, Juan J. Novoa, František Hartl. Substituent and counterion effects on the formation of π-dimer dications of end-capped heptathienoacenes. Chemical Communications. 2011; 47 (47):12622-12624.
Chicago/Turabian StyleCristina Capel Ferrón; María Del Carmen Ruiz Delgado; Juan Teodomiro López Navarrete; Barbara Vercelli; Marçal Capdevila Cortada; Weijun Niu; Mingqian He; Víctor Hernández; Gianni Zotti; Juan J. Novoa; František Hartl. 2011. "Substituent and counterion effects on the formation of π-dimer dications of end-capped heptathienoacenes." Chemical Communications 47, no. 47: 12622-12624.
A series of linear phenylene-based molecules, bearing carboxylic acid or carboxylate functionalities at both ends, were reacted with (hexadecylamine/stearate)-capped CdSe nanocrystals (7.5 nm diameter) dispersed in CHCl3 to form multilayers on ITO-glass surfaces via layer-by-layer (LBL) alternation. The new multilayered materials were investigated by UV-Vis spectroscopy, cyclic voltammetry, photoelectrochemistry and photoconductivity. The conjugated linkers, with reversible reduction potentials in the range −1.7 to −2.8 V vs. Ag/Ag+, ease charge transport between dots (LUMO at −1.4 V). Photoconduction is dominated by interdot distance and linker characteristics rather than by LUMO energy levels. The logarithm of photoconductivity and linker length are linearly related, as in conduction of molecular wires, and the tunnelling attenuation factor β value is 2.4 nm−1. Comparison of n-type aromatics and p-type oligothiophenes is discussed.
Barbara Vercelli; Gianni Zotti; Anna Berlin; Mariacecilia Pasini; Marco Natali. Self-assembled multilayers of CdSe nanocrystals and carboxylate-handled phenylene-based molecules: optical, electrochemical and photoconductive properties. Journal of Materials Chemistry 2011, 21, 8645 -8652.
AMA StyleBarbara Vercelli, Gianni Zotti, Anna Berlin, Mariacecilia Pasini, Marco Natali. Self-assembled multilayers of CdSe nanocrystals and carboxylate-handled phenylene-based molecules: optical, electrochemical and photoconductive properties. Journal of Materials Chemistry. 2011; 21 (24):8645-8652.
Chicago/Turabian StyleBarbara Vercelli; Gianni Zotti; Anna Berlin; Mariacecilia Pasini; Marco Natali. 2011. "Self-assembled multilayers of CdSe nanocrystals and carboxylate-handled phenylene-based molecules: optical, electrochemical and photoconductive properties." Journal of Materials Chemistry 21, no. 24: 8645-8652.
Oligothiophene-substituted 1,1,4,4-tetracyanobutadienes (TCBDs) have been synthesized by [2 + 2] cycloaddition reactions between tetracyanoethylene and oligothiophene alkynes. The TCBD moiety is compared to other electron acceptors attached to dibutylterthiophene including dicyanovinyl (DCV) and tricyanovinyl (TCV). These donor−acceptor molecules (TCBD-3T, DCV-3T, and TCV-3T) show red-shifted absorption spectra relative to the unsubstituted oligothiophene as a result of intramolecular charge-transfer (ICT). Monosubstituted terthiophenes bearing the electron acceptors show both oxidation and reduction processes as characterized by cyclic voltammetry. Density functional theory (DFT) calculations are used to explain the electronic and redox properties of the materials. Electrochemical oxidation of a bis(terthienyl)-substituted TCBD molecule (3T-TCBD-3T) yields a conducting polymer exhibiting balanced ambipolar redox conduction with similar values for the oxidized and reduced states of the polymer (1 × 10−3 S cm−1). Raman spectra of the asymmetric donor−acceptor materials are characterized by two intense bands characteristic of the aromatic and quinoidal regions in the conjugated π-system of the oligothiophene.
Ted M. Pappenfus; Deborah K. Schneiderman; Juan Casado; Juan T. López Navarrete; M. Carmen Ruiz Delgado; Gianni Zotti; Barbara Vercelli; Matthew D. Lovander; Lindsay M. Hinkle; Jon N. Bohnsack; Kent R. Mann. Oligothiophene Tetracyanobutadienes: Alternative Donor−Acceptor Architectures for Molecular and Polymeric Materials. Chemistry of Materials 2010, 23, 823 -831.
AMA StyleTed M. Pappenfus, Deborah K. Schneiderman, Juan Casado, Juan T. López Navarrete, M. Carmen Ruiz Delgado, Gianni Zotti, Barbara Vercelli, Matthew D. Lovander, Lindsay M. Hinkle, Jon N. Bohnsack, Kent R. Mann. Oligothiophene Tetracyanobutadienes: Alternative Donor−Acceptor Architectures for Molecular and Polymeric Materials. Chemistry of Materials. 2010; 23 (3):823-831.
Chicago/Turabian StyleTed M. Pappenfus; Deborah K. Schneiderman; Juan Casado; Juan T. López Navarrete; M. Carmen Ruiz Delgado; Gianni Zotti; Barbara Vercelli; Matthew D. Lovander; Lindsay M. Hinkle; Jon N. Bohnsack; Kent R. Mann. 2010. "Oligothiophene Tetracyanobutadienes: Alternative Donor−Acceptor Architectures for Molecular and Polymeric Materials." Chemistry of Materials 23, no. 3: 823-831.