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Synthesis of garland like ZnO nanorods and their application in dye sensitized solar cells
Thambidurai, M.,Muthukumarasamy, N.,Velauthapillai, D.,Lee, C. North-Holland 2013 Materials letters Vol.92 No.-
Garland like ZnO nanorods have been synthesized by the chemical bath deposition method. Dye sensitized solar cells have been assembled by using natural dye extracted from hibiscus rosasinensis as sensitizer in garland like ZnO nanorod films. X-ray diffraction result shows that garland like ZnO nanorods exhibit hexagonal structure. The ZnO nanorods have an average diameter of 100nm and the length of the nanorods is 2μm. The efficiency of the fabricated dye sensitized garland like ZnO nanorod based solar cell is 0.67%.
Importance of halide perovskites for next generation solar cells – A review
Kalaiselvi, C.R.,Muthukumarasamy, N.,Velauthapillai, Dhayalan,Kang, Misook,Senthil, T.S. Elsevier 2018 Materials letters Vol.219 No.-
<P><B>Abstract</B></P> <P>Halide perovskites have recently emerged as a promising material for low cost and high efficiency solar cells. Dye Sensitized Solar Cells (DSSCs) are the forerunners of perovskite solar cells. In liquid based dye sensitized solar cell the power conversion efficiency is low and also it had some stability issues. In 2012, a long term stable and high efficiency perovskite solar cell emerged by replacing liquid electrolyte with the solid hole conductor. The attractiveness of organometal halide perovskites are having suitable direct bandgap with large absorption coefficients, low cost and solution based fabrication process. This review summarizes the basic concepts of perovskite, their fabrication and its eminent properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Importance of organic metal halide perovskite presented clearly. </LI> <LI> The basic concepts of perovskite, fabrication and its eminent properties summarized. </LI> <LI> The effect of hole transporting material to achieve remarkable photovoltaic performance was explained. </LI> </UL> </P>
Iron doped vanadium sulfide anemone like nanorod structure for electrochemical water oxidation
Swathi S.,Yuvakkumar R.,Ravi G.,S.I. Hong,Babu E. Sunil,Velauthapillai Dhayalan,Algarni Tahani Saad,Al-Mohaimeed Amal M. 한국물리학회 2021 Current Applied Physics Vol.21 No.-
Bare and Fe doped vanadium sulfide nanorods was synthesized by employing sol-gel method. The obtained (011) plane revealed and confirmed the orthorhombic phase of vanadium sulfide (VS). Fe doped vanadium sulfide anemone like nanorods structure were demonstrated by morphological evolution employing SEM studies. FTIR studies confirmed the vibrational frequencies of the prepared samples and identify the functional groups. Raman technique is also used to observe the vibrational modes of molecules and PL revealed the prepared samples optical-electronic nature. Additionally, electrochemical studies such as cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and chronoampherometry (CA) was recorded for determination of specific capacitance, current density and stability. High doped vanadium sulfide has elevated 1372 F/g specific capacitance at 385 mA/g current density attained from CV and LSV curves at 10 mV/s and it has proven the excellent OER activity.
Cancer targeting potential of bioinspired chain like magnetite (Fe3O4) nanostructures
S. Swathi,Fuad Ameen,G. Ravi,R. Yuvakkumar,S.I. Hong,Dhayalan Velauthapillai,Muneera D.F. AlKahtani,M. Thambidurai,Cuong Dang 한국물리학회 2020 Current Applied Physics Vol.20 No.8
Iron is significant, earth abundant and inexpensive materials in everyday use. Non toxicity and clean manufacturing process is still a challenging role in scientific world. The chain like Fe3O4 nanostructures were synthesized using the mixtures such as iron nitrate and Rambutan. Magnetite Fe3O4 was verified using X-ray powder diffraction (XRD). Metal oxide (Fe–O) and A1g and Eg phonon modes are substantiated employing Fouriertransform infrared spectroscopy (FTIR) and Raman spectra. A product chemical state was investigated by high resolution X-ray photoelectron spectroscopy (XPS) spectra. Chain like morphology and polycrystalline nature is attributed by transmission electron microscopy (TEM) analysis. Weight loss activity was revealed through thermogravimetric analysis (TGA) analysis. In application studies, higher concentration of Fe3O4 nanostructures was more effective than the low concentration. Moreover, cytotoxicity effects and cell viability on human cancer cell lines were observed and tested for cancer treatment.
Thambidurai, M.,Kim, Jun Young,Ko, Youngjun,Song, Hyung-jun,Shin, Hyeonwoo,Song, Jiyun,Lee, Yeonkyung,Muthukumarasamy, N.,Velauthapillai, Dhayalan,Lee, Changhee The Royal Society of Chemistry 2014 Nanoscale Vol.6 No.15
<P>High efficiency inverted organic solar cells are fabricated using the PTB7:PC71BM polymer by incorporating Zn-doped TiO2 (ZTO) and 0.05 wt% PEO:ZTO as interfacial electron transport layers. The 0.05 wt% PEO-modified ZTO device shows a significantly increased power conversion efficiency (PCE) of 8.10%, compared to that of the ZTO (7.67%) device.</P>
Solution-based synthesis of high yield CZTS (Cu<sub>2</sub>ZnSnS<sub>4</sub>) spherical quantum dots
Rajesh, G.,Muthukumarasamy, N.,Subramanian, E.P.,Venkatraman, M.R.,Agilan, S.,Ragavendran, V.,Thambidurai, M.,Velumani, S.,Yi, J.,Velauthapillai, D. Academic Press 2015 Superlattices and microstructures Vol.77 No.-
High yield CZTS quantum dots have been synthesized using simple precursors by chemical precipitation technique. Formation mechanism of CZTS spherical quantum dots also has been investigated. According to the mechanism, copper sulfide nuclei firstly forms, and serves as the starting point for the nucleation and growth of CZTS. X-ray diffraction pattern, X-ray photoelectron spectra (XPS) and Raman spectra reveals the formation of pure kesterite structure Cu<SUB>2</SUB>ZnSnS<SUB>4</SUB> nanoparticles. HRTEM analysis reveals the formation of CZTS quantum dots with an average particle size of ~8.3nm. The elemental distribution of CZTS quantum dots studied using STEM elemental mapping reveals that Cu, Zn, Sn and S are present in the sample. The photoluminescence spectra of CZTS exhibit a broad red emission band at 657nm. The optical band gap is shifted to the higher energy side and it shows the presence of quantum confinement effect.