Additive-Free Shape-Invariant Nano-to-Micron Size-Tuning of Cu2O Cubic Crystals by Square-Wave Voltammetry

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• 作者：Xuyun Guo ; Weiqiang Lv ; Xiao-Yuan Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：May 22, 2014
• 年：2014
• 卷：118
• 期：20
• 页码：11062-11077
• 全文大小：1073K
• 年卷期：v.118,no.20(May 22, 2014)
• ISSN：1932-7455

文摘

We demonstrate in this study the application of square-wave voltammetry (SWV), an electrochemical technique that has been commonly employed in electroanalysis but much less utilized in electrocrystallization, in the shape-invariant size-tuning of the electrodeposited cuprous oxide (Cu₂O) crystalline cubic particles from 30 nm to 3 渭m in aqueous solution under ambient conditions without using any organic surfactant and surface capping agent. We show systematically how each and every adjustable parameter in SWV technique affects the size-tuning of Cu₂O nanocubes under shape invariance. A systematic comparison was made between SWV and several other EC techniques, including linear-sweep voltammetry (LSV), stair-case voltammetry (SCV), chronoamperometry (CA or simple i vs t), square-wave chronoamperometry (SWCA), and differential pulse voltammetry (DPV), for the shape-invariant electrodeposition of crystalline Cu₂O nanocubes. The as-fabricated Cu₂O nanocubes were employed as the size- and shape-controlled galvanic templates to fabricate Cu₂O@Ag core鈥搒hell structures which display excellent performance in 鈥渟ingle-particle鈥?surface-enhanced Raman spectroscopy (sp-SERS).