Light-Driven, Facet-Selective Transformation of Cuprous Oxide Microcrystals to Hollow Copper Nanoshells
Light-Driven, Facet-Selective Transformation of Cuprous Oxide Microcrystals to Hollow Copper Nanoshells
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DOI：
10.1021/acs.chemmater.9b02240
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发表时间：
2019-09
影响因子：
8.6
通讯作者：
Chu Qin;Brandon M. Campbell;Meikun Shen;Tongyu Zhao;B. Sadtler
中科院分区：
文献类型：
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作者：
Chu Qin;Brandon M. Campbell;Meikun Shen;Tongyu Zhao;B. Sadtler
光激发可用于控制无机材料的组成和纳米级形貌。本文报道了小面氧化亚铜(Cu2O)微晶的光诱导转化为由氧化亚铜的内层和金属铜的外壳组成的中空颗粒。在氢氧化钠溶液中，当混合了{100}和{111}晶面的氧化亚铜微晶处于负偏压(−1.0V vs Ag/AgCl1)时，光可以选择性地促进铜金属在{100}晶面上的生长，而晶体内部则在{111}晶面上被刻蚀。共形铜层在立方八面体微晶的顶点处生长连接，形成一个中空壳。这一过程只有在有照明的情况下才能观察到。在没有外加偏压的情况下，在相同的NaOH溶液中，在光照下优先刻蚀{100}面。我们认为这种光驱动的、面选择性的转变源于半导体/电子材料的电势依赖的结构和能量学。
Photoexcitation can be used to control the composition and nanoscale morphology of inorganic materials. Here we report the photoinduced transformation of faceted cuprous oxide (Cu2O) microcrystals to hollow particles consisting of an inner region of cuprous oxide and an outer shell of copper metal. When cuprous oxide microcrystals with mixed {100} and {111} facets are held at a negative bias (−1.0 V vs Ag/AgCl) in a solution of sodium hydroxide (NaOH), light mediates the growth of copper metal selectively on the {100} facets while the crystal interior is etched at {111} facets. Conformal Cu layers grow to connect at vertices of the cuboctahedral microcrystals and form a hollow shell. This process is only observed in the presence of illumination. Without an applied bias the {100} facets are preferentially etched under illumination in the same NaOH solution. We propose this light-driven, facet-selective transformation arises from the potential-dependent structure and energetics of the semiconductor/electrol...