Controllable Growth Orientation of Ag2O and Cu2O Films by Electrocrystallization from Aqueous Solutions

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• 作者：Tsutomu Shinagawa ; Yuya Ida ; Kotaro Mizuno ; Seiji Watase ; Mitsuru Watanabe ; Minoru Inaba ; Akimasa Tasaka ; Masanobu Izaki
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：January 2, 2013
• 年：2013
• 卷：13
• 期：1
• 页码：52-58
• 全文大小：451K
• 年卷期：v.13,no.1(January 2, 2013)
• ISSN：1528-7505

文摘

We demonstrate that Ag₂O and Cu₂O polycrystal films with a cubic cuprite structure can be grown on F:SnO₂ substrates with controllable crystal orientation between 111 and 100 directions by galvanostatic electrocrystallization from aqueous electrolytes. The Ag₂O and Cu₂O films have been electrodeposited at different applied current densities determined by linear-sweep voltammetry (LSV) measurements, and their crystal structure and morphology were characterized with X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The XRD results show the preferred growth orientation changed from 111 to 100 with increasing and decreasing current density for Ag₂O and Cu₂O, respectively. The surface morphology, especially for the Cu₂O films, was also changed from a three-sided pyramidal shape to a four-sided pyramidal shape corresponding to the orientation. We also give a reasonable explanation for the observed trend in the growth orientation by considering the formation rate of AgOH and CuOH; higher and lower rates appear to yield 111 and 100 preferred orientation, respectively.