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For postdoctoral studies
Tsinghua University
To pursue a Doctoral degree in Material Science.
CONACyT (300851)
University Lecturer
01 December 2019 - 31 August 2021
Post Doctoral Researcher
01 September 2017 - 01 September 2019
Experienced Postdoctoral Fellow with a demonstrated history of working in the higher education industry. Skilled in Quantimchemical Modeling, Materials Science, Electrochemistry, 2D Materials, Nanomaterials, and Nanotechnology. Strong research professional with a Doctor of Philosophy - PhD focused in Computational Chemistry from Universidad de Guadalajara.
In the present paper, aqueous extracts ofAlchemilla Vulgaris (Aslan Pençesi) leaves have been used to prepare Fe3O4 nano-flakes accompanied by calcination at 400°C. The various properties of biosynthesised Fe3O4 nano-flakes were investigated using UV–Visible, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-Ray diffraction (XRD), cyclic voltammetry, thermogravimetric (TG), and differential thermal analysis (DTA) respectively. The SEM study reveals the formation of flake-like structure with a diameter of 85 nm and a thickness of 9 nm respectively. The DTA curve shows two endothermic peaks corresponding to the decomposition of organic matter and the deoxidation of FeO (Wustite) to α-Fe, respectively, and their activation energy values were found to be 5.73 and 16.43 kJ/moles, respectively. The green synthesised magnetite nano-flakes is proved to be an excellent electrocatalyst for the electro-oxidation of ascorbic acid. The effect of scan rates, the concentration of the modifier, and the analyte was also investigated.
Rajendrachari Shashanka; Gururaj Kudur Jayaprakash; Prakashaiah B.G; Mohan Kumar; B.E Kumara Swamy. Electrocatalytic determination of ascorbic acid using a green synthesised magnetite nano-flake modified carbon paste electrode by cyclic voltammetric method. Materials Research Innovations 2021, 1 -11.
AMA StyleRajendrachari Shashanka, Gururaj Kudur Jayaprakash, Prakashaiah B.G, Mohan Kumar, B.E Kumara Swamy. Electrocatalytic determination of ascorbic acid using a green synthesised magnetite nano-flake modified carbon paste electrode by cyclic voltammetric method. Materials Research Innovations. 2021; ():1-11.
Chicago/Turabian StyleRajendrachari Shashanka; Gururaj Kudur Jayaprakash; Prakashaiah B.G; Mohan Kumar; B.E Kumara Swamy. 2021. "Electrocatalytic determination of ascorbic acid using a green synthesised magnetite nano-flake modified carbon paste electrode by cyclic voltammetric method." Materials Research Innovations , no. : 1-11.
Synthetic dyes are commonly used in food products like soft drinks, vegetable sauces, jellies, etc. Most artificial dyes can cause cancer, therefore it is very important to develop sensors to detect them in food samples. Voltammetric methods with carbon paste electrodes (CPEs) are promising for this purpose. However, modification of CPEs is necessary to detect the commercial dyes in food samples in the presence of interferents. In the current review, we have discussed the different previous research in which detection of dyes is performed in real samples with good detection limits. The current review will be helpful for readers who are interested in developing low-cost electrodes for the effective determination of dyes in commercial products like soft drinks and vegetable sauces.
Isha Soni; Pankaj Kumar; Shruti Sharma; Gururaj Kudur Jayaprakash. A Short Review on Electrochemical Sensing of Commercial Dyes in Real Samples Using Carbon Paste Electrodes. Electrochem 2021, 2, 274 -294.
AMA StyleIsha Soni, Pankaj Kumar, Shruti Sharma, Gururaj Kudur Jayaprakash. A Short Review on Electrochemical Sensing of Commercial Dyes in Real Samples Using Carbon Paste Electrodes. Electrochem. 2021; 2 (2):274-294.
Chicago/Turabian StyleIsha Soni; Pankaj Kumar; Shruti Sharma; Gururaj Kudur Jayaprakash. 2021. "A Short Review on Electrochemical Sensing of Commercial Dyes in Real Samples Using Carbon Paste Electrodes." Electrochem 2, no. 2: 274-294.
The ZnO nanoparticles (NPs) are considered to be one of the inexpensive and very important bioactive materials widely used in drug delivery, as a photo-catalyst material, antibacterial, bioimaging, anticancer, anti-inflammation, wound healing, and diabetes treatment. Therefore, we have prepared ZnO NPs using Alchemilla vulgaris (Lady’s mantle) leaves and investigated their anti-enzymatic properties. Phases of the ZnO NPs were determined from X-Ray diffraction (XRD) spectra. The shape and size of the green synthesized NPs were investigated by scanning electron microscopy (SEM) and it confirms the cauliflower shape with an average size of 120 nm. But the beads inside the cauliflower shape are 20 nm in size. The prepared ZnO NPs show the cumulative median particle size of 550 nm. The thermogravimetric (TG) and differential thermal analysis (DTA) were performed at different heating rates to study the percentage of weight loss, and activation energy. The activation energy was calculated to be 4.98 kJ/moles using Kissinger method. We also studied the enzyme inhibition effect of ZnO NPs containing biologically active groups on important metabolic enzymes like butyrylcholinesterase(BChE), acetylcholinesterase (AChE) and α-glycosidase (α-Gly) enzymes. The bandgap of ZnO NPs was also studied by UV–Vis spectroscopy via Tauc's method and it was determined to be 3.27 eV. The photocatalytic property of the ZnO NPs was executed against rhodamine B (RhB) under the illumination of an AM 1.5 solar simulator.
Shashanka Rajendrachari; Parham Taslimi; Abdullah Cahit Karaoglanli; Orhan Uzun; Emre Alp; Gururaj Kudur Jayaprakash. Photocatalytic degradation of Rhodamine B (RhB) dye in waste water and enzymatic inhibition study using cauliflower shaped ZnO nanoparticles synthesized by a novel One-pot green synthesis method. Arabian Journal of Chemistry 2021, 14, 103180 .
AMA StyleShashanka Rajendrachari, Parham Taslimi, Abdullah Cahit Karaoglanli, Orhan Uzun, Emre Alp, Gururaj Kudur Jayaprakash. Photocatalytic degradation of Rhodamine B (RhB) dye in waste water and enzymatic inhibition study using cauliflower shaped ZnO nanoparticles synthesized by a novel One-pot green synthesis method. Arabian Journal of Chemistry. 2021; 14 (6):103180.
Chicago/Turabian StyleShashanka Rajendrachari; Parham Taslimi; Abdullah Cahit Karaoglanli; Orhan Uzun; Emre Alp; Gururaj Kudur Jayaprakash. 2021. "Photocatalytic degradation of Rhodamine B (RhB) dye in waste water and enzymatic inhibition study using cauliflower shaped ZnO nanoparticles synthesized by a novel One-pot green synthesis method." Arabian Journal of Chemistry 14, no. 6: 103180.
Frontier molecular orbital and analytical Fukui functions were used to theoretically study cationic surfactant cetyltrimethylammonium bromide (CTAB), predicting its capability for sensitive detection of guanine (GU), uric acid (UA), and dopamine (DA). Herein, we fabricated the CTAB-modified carbon paste electrode (CTCPE), and it exhibited improved sensitivity for the simultaneous detection of three biomolecules, GU, UA, and DA due to the active sites of the CTAB molecules on the electrode surface, which is also proved by our theoretical studies. The CTCPE was used to effectively analyze the various concentration of biomolecules in the mixture containing GU, UA, and DA. The lowest detection limits for the linear range of GU (2–60 μM), UA (5–125 μM), and DA (1–70 μM) have been found to be 0.3, 1.7, and 0.2 μM, respectively. For the detection of target molecules in real samples, such as herring sperm DNA, DA injection, and human blood serum, the CTCPE shows considerably good performance. In our studies, the CTCPE demonstrates good repeatability, stability, and selectivity for detecting GU, UA, and DA with high sensitivity.
Mohan Kumar; Yongsheng Fu; Miao Wang; B.E. Kumara Swamy; Gururaj Kudur Jayaprakash; Wei Zhao. Influence of cationic surfactant cetyltrimethylammonium bromide for electrochemical detection of guanine, uric acid and dopamine. Journal of Molecular Liquids 2020, 321, 114893 .
AMA StyleMohan Kumar, Yongsheng Fu, Miao Wang, B.E. Kumara Swamy, Gururaj Kudur Jayaprakash, Wei Zhao. Influence of cationic surfactant cetyltrimethylammonium bromide for electrochemical detection of guanine, uric acid and dopamine. Journal of Molecular Liquids. 2020; 321 ():114893.
Chicago/Turabian StyleMohan Kumar; Yongsheng Fu; Miao Wang; B.E. Kumara Swamy; Gururaj Kudur Jayaprakash; Wei Zhao. 2020. "Influence of cationic surfactant cetyltrimethylammonium bromide for electrochemical detection of guanine, uric acid and dopamine." Journal of Molecular Liquids 321, no. : 114893.
In this work, both electrochemical experiments and quantum chemical simulations were performed to explore an important topic namely the cetyl pyridinium bromide (CPB) modified carbon paste electrode (CPBMCPE) employed for detection of dopamine (DA) and uric acid (UA). The electrode was found to display excellent electrocatalysis and increased surface area for simultaneously detecting DA and UA via decreasing their oxidation overpotentials when compared to the bare electrode, demonstrating high selectivity and sensitivity. Although surfactants can increase carbon-electrode sensitivity for DA detection, its mechanism remains elusive. Here, we used quantum chemical models to tackle the interface at which sensing (electron transfer) takes place. Our computational results reveal that the charged cationic head of CPBs can offer an additional electron transfer site at the CPBMCPE interface such that the sensing ability of CPE is comparatively improved after the CPB modification. Such electrodes were also applied for sensing UA in a urine sample, reaching a satisfactory of recovery up to 98%. To comprehend, we also modeled the power of electron-accepting and donating of CPB with other commonly used cationic surfactants.
Gururaj Kudur Jayaprakash; B.E. Kumara Swamy; Juan Pablo Mojica Sánchez; Xiuting Li; S.C. Sharma; Shern-Long Lee. Electrochemical and quantum chemical studies of cetylpyridinium bromide modified carbon electrode interface for sensor applications. Journal of Molecular Liquids 2020, 315, 113719 .
AMA StyleGururaj Kudur Jayaprakash, B.E. Kumara Swamy, Juan Pablo Mojica Sánchez, Xiuting Li, S.C. Sharma, Shern-Long Lee. Electrochemical and quantum chemical studies of cetylpyridinium bromide modified carbon electrode interface for sensor applications. Journal of Molecular Liquids. 2020; 315 ():113719.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; B.E. Kumara Swamy; Juan Pablo Mojica Sánchez; Xiuting Li; S.C. Sharma; Shern-Long Lee. 2020. "Electrochemical and quantum chemical studies of cetylpyridinium bromide modified carbon electrode interface for sensor applications." Journal of Molecular Liquids 315, no. : 113719.
Developing sensors to detect lead alternative additive like ferrocene (FC) in the gasoline is essential for automobile industries. In the current work, we have detected FC in commercial gasoline using carbon paste electrode (CPE). FC was interacted to CPE interface by grinding, immobilization, and mobilization method to understand its Electron transfer (ET) mechanism. ET properties of FC strongly depends on its interaction mode. FC displayed quasi-reversible ET behavior when they are interacted by grinding and immobilization method at the CPE interface but they showed reversible ET nature when they are interacted by mobilization method. However, mass transfer process is adsorption controlled at mobilization methods and diffusion controlled in remaining cases. As a part of work, we have also studied the mass transfer process of FC in gasoline which was also found to be diffusion controlled. Experimental results are further verified using density functional theory based calculations. Further development of this methodology will be helpful in future for developing electrochemical sensors to detect lead alternative additive in gasoline.
Gururaj Kudur Jayaprakash; Bahaddurghatta Eshwaraswamy Kumara Swamy; S.C. Sharma; Juan Julián Santoyo-Flores. Analyzing electron transfer properties of ferrocene in gasoline by cyclic voltammetry and theoretical methods. Microchemical Journal 2020, 158, 105116 .
AMA StyleGururaj Kudur Jayaprakash, Bahaddurghatta Eshwaraswamy Kumara Swamy, S.C. Sharma, Juan Julián Santoyo-Flores. Analyzing electron transfer properties of ferrocene in gasoline by cyclic voltammetry and theoretical methods. Microchemical Journal. 2020; 158 ():105116.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; Bahaddurghatta Eshwaraswamy Kumara Swamy; S.C. Sharma; Juan Julián Santoyo-Flores. 2020. "Analyzing electron transfer properties of ferrocene in gasoline by cyclic voltammetry and theoretical methods." Microchemical Journal 158, no. : 105116.
Fabrication of biocompatible electrodes for the investigation of catecholamines is a known challenge. In this work, methionine was chosen as a modifier for fabrication of a biocompatible carbon paste electrode by electropolymerization, through cyclic voltammetry. The electrochemical behavior of the poly(methionine) modified carbon paste electrode was characterized by cyclic voltammetry for simultaneous determination of dopamine (DA) and uric acid (UA) in a phosphate-buffered solution at pH 7.0. In the absence of an amino acid methionine layer, the bare carbon paste electrode exhibits rather poor voltammetric signals in DA and UA in the binary mixture, with oxidation potentials of DA and UA overlapping with each other. The poly(methionine) modified carbon paste electrode exhibits good catalytic activity with noticeably different oxidation potentials of DA and UA. The experimental results closely agree with the theoretical prediction based on a Fukui function complementary to the simulated electrostatic potential maps.
Bananakere Nanjegowda Chandrashekar; Weizhong Lv; Gururaj Kudur Jayaprakash; Karim Harrath; Louis W.Y. Liu; Bahaddurghatta E. Kumara Swamy. Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid. Chemosensors 2019, 7, 24 .
AMA StyleBananakere Nanjegowda Chandrashekar, Weizhong Lv, Gururaj Kudur Jayaprakash, Karim Harrath, Louis W.Y. Liu, Bahaddurghatta E. Kumara Swamy. Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid. Chemosensors. 2019; 7 (2):24.
Chicago/Turabian StyleBananakere Nanjegowda Chandrashekar; Weizhong Lv; Gururaj Kudur Jayaprakash; Karim Harrath; Louis W.Y. Liu; Bahaddurghatta E. Kumara Swamy. 2019. "Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid." Chemosensors 7, no. 2: 24.
The active electron transfer (ET) sites on the graphene surface can be controlled by hexagonal boron nitride (h-BN) doping.
Gururaj Kudur Jayaprakash; Roberto Flores-Moreno. Regioselectivity in hexagonal boron nitride co-doped graphene. New Journal of Chemistry 2018, 42, 18913 -18918.
AMA StyleGururaj Kudur Jayaprakash, Roberto Flores-Moreno. Regioselectivity in hexagonal boron nitride co-doped graphene. New Journal of Chemistry. 2018; 42 (23):18913-18918.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; Roberto Flores-Moreno. 2018. "Regioselectivity in hexagonal boron nitride co-doped graphene." New Journal of Chemistry 42, no. 23: 18913-18918.
Oxygen vacancies (VO) as a type of intrinsic defects play a key role in determining zinc oxide (ZnO) properties. Herein, ZnO nanorods with uniform morphology have been synthesized via hydrothermal method. The obtained nanorods appear semitransparent in SEM images indicating their electron semitransparent nature (ESN). Dye sensitized solar cells (DSSCs) studies reveal the superior electron transport property of the prepared nanorods further confirming their ESN. XPS, optical absorption, and DSSCs results suggest that the origin of ESN is the presence of an appropriate amount of VO in the ZnO nanorods. Moreover, the obtained ZnO nanorods exhibit excellent photocatalytic activity in decomposition of phenol under sunlight irradiation which is attributed to VO. Our study introduces a fundamental insight into the role of VO in inducing ESN as a new property for ZnO.
Abdo Hezam; K. Namratha; Q.A. Drmosh; Bananakere Nanjegowda Chandrashekar; Gururaj Kudur Jayaprakash; Chun Cheng; S. Srikanta Swamy; K. Byrappa. Electronically semitransparent ZnO nanorods with superior electron transport ability for DSSCs and solar photocatalysis. Ceramics International 2018, 44, 7202 -7208.
AMA StyleAbdo Hezam, K. Namratha, Q.A. Drmosh, Bananakere Nanjegowda Chandrashekar, Gururaj Kudur Jayaprakash, Chun Cheng, S. Srikanta Swamy, K. Byrappa. Electronically semitransparent ZnO nanorods with superior electron transport ability for DSSCs and solar photocatalysis. Ceramics International. 2018; 44 (6):7202-7208.
Chicago/Turabian StyleAbdo Hezam; K. Namratha; Q.A. Drmosh; Bananakere Nanjegowda Chandrashekar; Gururaj Kudur Jayaprakash; Chun Cheng; S. Srikanta Swamy; K. Byrappa. 2018. "Electronically semitransparent ZnO nanorods with superior electron transport ability for DSSCs and solar photocatalysis." Ceramics International 44, no. 6: 7202-7208.
We have improved the sensitivity of a carbon paste electrode from lysine for the sensitive detection of dopamine.
Gururaj Kudur Jayaprakash; B.E.Kumara Swamy; Henry Nicole González Ramírez; Musturappa Tumbre Ekanthappa; Roberto Flores-Moreno. Quantum chemical and electrochemical studies of lysine modified carbon paste electrode surfaces for sensing dopamine. New Journal of Chemistry 2018, 42, 4501 -4506.
AMA StyleGururaj Kudur Jayaprakash, B.E.Kumara Swamy, Henry Nicole González Ramírez, Musturappa Tumbre Ekanthappa, Roberto Flores-Moreno. Quantum chemical and electrochemical studies of lysine modified carbon paste electrode surfaces for sensing dopamine. New Journal of Chemistry. 2018; 42 (6):4501-4506.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; B.E.Kumara Swamy; Henry Nicole González Ramírez; Musturappa Tumbre Ekanthappa; Roberto Flores-Moreno. 2018. "Quantum chemical and electrochemical studies of lysine modified carbon paste electrode surfaces for sensing dopamine." New Journal of Chemistry 42, no. 6: 4501-4506.
Gururaj Kudur Jayaprakash; B.E.Kumara Swamy; Norberto Casillas; Roberto Flores-Moreno. Analytical Fukui and cyclic voltammetric studies on ferrocene modified carbon electrodes and effect of Triton X-100 by immobilization method. Electrochimica Acta 2017, 258, 1025 -1034.
AMA StyleGururaj Kudur Jayaprakash, B.E.Kumara Swamy, Norberto Casillas, Roberto Flores-Moreno. Analytical Fukui and cyclic voltammetric studies on ferrocene modified carbon electrodes and effect of Triton X-100 by immobilization method. Electrochimica Acta. 2017; 258 ():1025-1034.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; B.E.Kumara Swamy; Norberto Casillas; Roberto Flores-Moreno. 2017. "Analytical Fukui and cyclic voltammetric studies on ferrocene modified carbon electrodes and effect of Triton X-100 by immobilization method." Electrochimica Acta 258, no. : 1025-1034.
Gururaj Kudur Jayaprakash; Roberto Flores-Moreno. Quantum chemical study of Triton X-100 modified graphene surface. Electrochimica Acta 2017, 248, 225 -231.
AMA StyleGururaj Kudur Jayaprakash, Roberto Flores-Moreno. Quantum chemical study of Triton X-100 modified graphene surface. Electrochimica Acta. 2017; 248 ():225-231.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; Roberto Flores-Moreno. 2017. "Quantum chemical study of Triton X-100 modified graphene surface." Electrochimica Acta 248, no. : 225-231.
Gururaj Kudur Jayaprakash; B.E.Kumara Swamy; Bananakere Nanjegowda Chandrashekar; Roberto Flores-Moreno. Theoretical and cyclic voltammetric studies on electrocatalysis of benzethonium chloride at carbon paste electrode for detection of dopamine in presence of ascorbic acid. Journal of Molecular Liquids 2017, 240, 395 -401.
AMA StyleGururaj Kudur Jayaprakash, B.E.Kumara Swamy, Bananakere Nanjegowda Chandrashekar, Roberto Flores-Moreno. Theoretical and cyclic voltammetric studies on electrocatalysis of benzethonium chloride at carbon paste electrode for detection of dopamine in presence of ascorbic acid. Journal of Molecular Liquids. 2017; 240 ():395-401.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; B.E.Kumara Swamy; Bananakere Nanjegowda Chandrashekar; Roberto Flores-Moreno. 2017. "Theoretical and cyclic voltammetric studies on electrocatalysis of benzethonium chloride at carbon paste electrode for detection of dopamine in presence of ascorbic acid." Journal of Molecular Liquids 240, no. : 395-401.
Here analytical Fukui functions based on density functional theory are applied to investigate the redox reactivity of pristine and defected graphene lattices. A carbon H-terminated graphene structure (with 96 carbon atoms) and a graphene defected surface with Stone–Wales rearrangement and double vacancy defects are used as models. Pristine sp2-hybridized, hexagonal arranged carbon atoms exhibit a symmetric reactivity. In contrast, common carbon atoms at reconstructed polygons in Stone–Wales and double vacancy graphene display large reactivity variations. The improved reactivity and the regioselectivity at defected graphene is correlated to structural changes that caused carbon–carbon bond length variations at defected zones.
Gururaj Kudur Jayaprakash; Norberto Casillas; Pablo D. Astudillo-Sánchez; Roberto Flores-Moreno. Role of Defects on Regioselectivity of Nano Pristine Graphene. The Journal of Physical Chemistry A 2016, 120, 9101 -9108.
AMA StyleGururaj Kudur Jayaprakash, Norberto Casillas, Pablo D. Astudillo-Sánchez, Roberto Flores-Moreno. Role of Defects on Regioselectivity of Nano Pristine Graphene. The Journal of Physical Chemistry A. 2016; 120 (45):9101-9108.
Chicago/Turabian StyleGururaj Kudur Jayaprakash; Norberto Casillas; Pablo D. Astudillo-Sánchez; Roberto Flores-Moreno. 2016. "Role of Defects on Regioselectivity of Nano Pristine Graphene." The Journal of Physical Chemistry A 120, no. 45: 9101-9108.