Photoconductive cadmium sulfide hemicylindrical shell nanowire ensembles

被引：134

作者：

Li, QG ^{[1
]}

Penner, RM ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA

来源：

NANO LETTERS | 2005年 / 5卷 / 09期

关键词：

D O I：

10.1021/nl050994x

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the synthesis and characterization of hemicylindrical shell nanowires (HSNWs) composed of nanocrystalline cadmium sulfide (CdS). CdS HSNWs were synthesized by first electrodepositing microcrystalline cadmium (Cd) nanowires by electrochemical step-edge decoration on graphite electrode surfaces and then converting these Cd nanowires into CdS by exposure to H2S at elevated temperature. These nanowires had a hemicylindrical shell morphology that was produced by the Kirkendall effect, involving disparate rates for diffusion of Cd and S atoms within the nascent CdS layer during the conversion from Cd to CdS. The outer diameter of the CdS HSNWs was 1.6-2.4 times that of Cd precursor nanowires and was adjustable over the range from 116 to 550 nm. CdS HSNWs showed strong, band-edge photoluminescence at 2.45 eV and a fast, reversible, and stable photoconductivity response in air characterized by "on" and "off" times of less than 15 ms.

引用

页码：1720 / 1725

页数：6

共 35 条

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