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Fabrication and Characterization of CuO nanowires on V-shaped Microgroove surfaces
Deng Daxiang,Zheng Jian,Xiaolong Chen,Sun Wei 한국물리학회 2021 Current Applied Physics Vol.28 No.-
This study developed a facile and scalable thermal oxidation method to prepare CuO nanowires on the electrodischarge machining (EDM) processed V-shaped microgrooves. The formation feasibility, surface morphology, and wetting properties of nanowires on V-shaped microgrooves were explored by the variation of thermal oxidation temperatures from 300 to 600 ◦C, and oxidation times from 2 h to 8 h. Nanowires were found to successfully synthesized on the V-shaped microgrooves surfaces when annealing temperature was 400 ◦C or higher. The microvoids or microcavities on the EDM processed V-shaped microgrooves surfaces contributed to the stress grain boundary (GB) diffusion of copper atoms, and facilitated the growth of nanowires. The diameter of nanowires increased monotonically when the annealing temperatures increased, whereas it almost kept unchanged with increasing annealing times. The length of nanowires was influenced positively by both annealing temperature and annealing time. All the nanowire samples showed hydrophobic properties of water.
Longzhu Li,Huidong Tang,Yuwei Chen,Rong Yang,Daxiang Tian,Zhidong Chen 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.5
The photoelectrocatalytic water splitting performance of the pristine hematite is limited because of its poor bulk chargeseparation efficiency. In this study, the lactic acid modified hematite films were grown in situ on Fluorine-doped tin oxidesubstrates by hydrothermal method and then annealed in nitrogen atmosphere. At 1.5 V versus RHE, the photocurrent densityof the optimal lactic acid modified hematite photoanode (0.075LA-Fe2O3) was 1.5 mA cm−2, which was three times that ofthe based hematite (0.5 mA cm−2). The enhanced photoelectrocatalytic performance of the lactic acid modified hematitewas attributed to its increased bulk charge separation efficiency caused by the oxygen vacancies and island-like pattern, aswell as its improved surface charge injection efficiency. The effect of lactic acid on the morphology, crystalline structure andphotoelectrocatalytic performance of the hematite photoanode are studied by systematical characterization.