標題: Conformal Electrodeposition of Co-Ni to Improve the Mechanical Properties of Three-Dimensional Ordered Macroporous Ni Films
作者: Wang, Guang-Ren
Hung, Pei-Sung
Chang, Shou-Yi
Yang, Jenn-Ming
Tseng, Yuan-Chieh
Wu, Pu-Wei
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 22-一月-2020
摘要: Three-dimensional ordered macroporous Ni films, known as Ni inverse opals, are fabricated via a template approach in which polystyrene (PS) microspheres (820 nm in diameter) are assembled in closely-packed colloidal crystals via a vertical electrophoresis process, followed by electroplating of Ni into the interstitial voids within the colloidal crystals and the selective removal of PS microspheres. To improve its mechanical strength, a conformal Ni-Co layer (45 similar to 64 nm) is electrodeposited on the skeletons of the Ni inverse opals by cyclic voltammetry. After coating, from nano-indentation tests, the hardness and reduced elastic modulus are enhanced considerably (172 similar to 220% for hardness; 72 similar to 79% for reduced elastic modulus), as compared to those of pristine inverse opals. After an annealing treatment for the interdiffusion of Ni and Co, the sample reveals an even stronger hardness. X-ray diffraction patterns indicate that the finite thickness of the inverse opals skeletons induces preferential growth of the (111) plane. In short, a combined effect of solid solution alloying, thickening of inverse opals skeletons for greater load bearing, and a predominant (111) plane is responsible for the improved mechanical strength of the Ni inverse opals. (C) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
URI: http://dx.doi.org/10.1149/1945-7111/ab68c9
http://hdl.handle.net/11536/153973
ISSN: 0013-4651
DOI: 10.1149/1945-7111/ab68c9
期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume: 167
Issue: 2
起始頁: 0
結束頁: 0
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