Bias-Enhanced Optical pH Response of Group III鈥揘itride Nanowires
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- 作者：Jens Wallys ; J枚rg Teubert ; Florian Furtmayr ; Detlev M. Hofmann ; Martin Eickhoff
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：December 12, 2012
- 年：2012
- 卷：12
- 期：12
- 页码：6180-6186
- 全文大小：381K
- 年卷期：v.12,no.12(December 12, 2012)
- ISSN：1530-6992
文摘
We show that the photoluminescence intensity of GaN and InGaN nanowires in electrolytes sensitively responds to variations of the pH value and the applied bias. The realization of an electrochemical working point allows pH detection with a resolution better than 0.05 pH. The observed effects are attributed to bias-dependent nonradiative recombination processes competing with interband transitions. The results show that group III鈥搉itride nanowires are excellently suited as nanophotonic pH sensor elements.