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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%.
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>
Adinaveen Thambidurai,John Kennedy Lourdusamy,Judith Vijaya John,Sekaran Ganesan 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
We compared the relationship of the behavior and performance of sugarcane baggase and rice straw assupercapacitor electrodes. X-ray diffraction revealed the evolution of crystallites of carbon and silica during activation athigher temperature. The morphology of the carbon samples was determined by SEM. The surface area, pore volume,and pore size distribution of carbon composites were measured. The electrochemical responses were studied by usingcyclic voltammetry experiment at 25 oC in a three-electrode configuration. The specific capacitance of the sugarcanebagasse carbon electrodes was in the range 92-340 F/g, whereas for rice straw, it was found to be 56-112 F/g at scanrates of 2-3 mV/s. The sugarcane bagasse carbon exhibited better performance than rice straw carbon using H2SO4 asthe electrolyte. However, the results clearly show that lignocellulosic wastes possess a new biomass source of carbonaceousmaterials for high-performance supercapacitors.
S. Rajaboopathi,S. Thambidurai 한국물리학회 2017 Current Applied Physics Vol.17 No.12
Green synthesis of seaweed-macro algae based cadmium oxide-zinc oxide (SCZ) nanoparticles was prepared by the simple chemical precipitation method. The functional group characteristics and crystalline properties of the nanoparticles were analyzed by Fourier transform infra-red spectroscopy and Xray diffraction analysis. The optical band gap energy of SCZ nanoparticles showed in lower value (3.11 eV), these can be due to the incorporation of seaweed (SW) and cadmium oxide (CdO). Small fiber like seaweed constituent was entangled over the CdO-ZnO nanoparticles, these were confirmed with High resolution scanning electron microscope and Field emission gun-transmission electron microscope analysis. The particle size of SCZ nanoparticles was obtained in the range of 20e50 nm. Thermal characteristics of SCZ nanoparticles have higher stability than SW and SW-ZnO. The photo catalytic degradation performance of SCZ nanoparticles was significantly improved and their efficiency was achieved to 99.57, 95.2 and 94.3%, under sunlight, visible light and UV light irradiation using RB198 dye molecules, respectively. The higher percentage of RB198 dyes degraded within 15 min interval under sunlight irradiation. In addition, their photo degradation characteristics of nanoparticles were further tested to pollutants of phenol solution. These results indicate that the surfactant based CdO-ZnO nanoparticles could be employed as an efficient photo catalyst for the degradation of industrial effluents.
Nanostructured Electron-Selective Interlayer for Efficient Inverted Organic Solar Cells
Song, Jiyun,Lim, Jaehoon,Lee, Donggu,Thambidurai, M.,Kim, Jun Young,Park, Myeongjin,Song, Hyung-Jun,Lee, Seonghoon,Char, Kookheon,Lee, Changhee American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.33
<P>We report a unique nanostructured electron-selective interlayer comprising of In-doped ZnO (ZnO:In) and vertically aligned CdSe tetrapods (TPs) for inverted polymer:fullerene bulkheterojunction (BHJ) solar cells. With dimension-controlled CdSe TPs, the direct inorganic electron transport pathway is provided, resulting in the improvement of the short circuit current and fill factor of devices. We demonstrate that the enhancement is attributed to the roles of CdSe TPs that reduce the recombination losses between the active layer and buffer layer, improve the hole-blocking as well as electron-transporting properties, and simultaneously improve charge collection characteristics. As a result, the power conversion efficiency of PTB7:PC<SUB>70</SUB>BM based solar cell with nanostructured CdSe TPs increases to 7.55%. We expect this approach can be extended to a general platform for improving charge extraction in organic solar cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-33/acsami.5b04624/production/images/medium/am-2015-04624q_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b04624'>ACS Electronic Supporting Info</A></P>
Kim, Jun Young,Cho, Eunae,Kim, Jaehoon,Shin, Hyeonwoo,Roh, Jeongkyun,Thambidurai, Mariyappan,Kang, Chan-Mo,Song, Hyung-Jun,Kim, SeongMin,Kim, Hyeok,Lee, Changhee Optical Society of America 2015 Optics express Vol.23 No.19
<P>We demonstrate that nanocrystalline Al-doped zinc oxide (n-AZO) thin film used as an electron-extraction layer can significantly enhance the performance of inverted polymer solar cells based on the bulk heterojunction of poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT) and [6,6]-phenyl C<sub>71</sub>-butyric acid methyl ester (PC<sub>70</sub>BM). A synergistic study with both simulation and experiment on n-AZO was carried out to offer a rational guidance for the efficiency improvement. As a result, An n-AZO film with an average grain size of 13 to 22 nm was prepared by a sol-gel spin-coating method, and a minimum resistivity of 2.1 ?? 10<sup>-3</sup> 곽·cm was obtained for an Al-doping concentration of 5.83 at.%. When an n-AZO film with a 5.83 at.% Al concentration was inserted between the ITO electrode and the active layer (PCDTBT:PC<sub>70</sub>BM), the power conversion efficiency increased from 3.7 to 5.6%.</P>
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.