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Dongyun Guo, Yang Ju, Chengju Fu, Zhixiong Huang and Lianmeng Zhang
Zinc oxide (ZnO) is an n-type semiconductor with a wide direct band gap of 3.37 eV and a large exciton binding energy (60 meV). ZnO thinfilms have been widely applied in high technology such as optoelectronic devices, solar cells, piezoelectric transducers and gas sensors [ 1 – 7 ]. Many techniques have been utilized to prepare ZnO thinfilms, such as metal organic chemical vapor deposition, pulsed laser deposition, sputtering, hydrothermal, sol-gel method, etc. [ 8 – 18 ]. Due to the low cost and simple equipment, sol-gel method has been
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 TAO M., UDESHI D., AGARWAL S., MALDONADO
Damian Wojcieszak, Michał Mazur, Danuta Kaczmarek, Agata Poniedziałek, Piotr Domanowski, Bogumiła Szponar, Aleksandra Czajkowska and Andrzej Gamian
Rapid progress in engineering of biofunctional thin-film coatings has recently been observed. It is directly related to the increase of nosocomial infections and larger impact of microorganisms on a human life. For this reason, there is a necessity to find a new method for neutralization of microorganisms. Application of coatings, e.g. based on metal oxides, which exhibit antimicrobial and antifungal activity is very attractive solution to this problem. One of the materials that could be used for this purpose is titanium dioxide due to its
C.H. Voon, B.Y. Lim, S.C.B. Gopinath, Y. Al-Douri, K.L. Foo, M.K. Md Arshad, S.T. Ten, A.R. Ruslinda, U. Hashim and V.C.S. Tony
Cuprous oxide, a narrow bandgap p-type semiconductor, has been known as a potential material for applications in supercapacitors, hydrogen production, sensors, and energy conversion due to its properties such as non-toxicity, easy availability, cost effectiveness, high absorption coefficient in the visible region and large minority carriers diffusion length. In this study, Cu2O nanostructured thin film was fabricated by anodizing of Cu plates in ethylene glycol containing 0.15 M KOH, 0.1 M NH4F and 3 wt.% deionized water. The effects of anodizing voltage and temperature of electrolyte were investigated and reported. It was found that nanoporous Cu2O thin film was formed when anodizing voltages of 50 V and 70 V were used while a dense Cu2O thin film was formed due to the aggregation of smaller nanoparticles when 30 V anodizing voltage was used. Nanoplatelets thin film was formed when the temperature of electrolyte was reduced to 15 °C and 5 °C. X-ray diffraction confirmed the presence of Cu2O phase in thin film formed during anodizing of Cu plates, regardless of the anodizing voltage and temperature of electrolyte. Photoluminescence spectroscopy showed the presence of Cu2O peak at 630 nm corresponding to band gap of 1.97 eV. A mechanism of the formation of Cu2O thin film was proposed. This study reported the ease of tailoring Cu2O nanostructures of different morphologies using anodizing that may help widen the applications of this material