Highly Sensitive and Selective Colorimetric Sensing of Hg2+ Based on the Morphology Transition of Silver Nanoprisms
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- 作者：Ling Chen ; Xiuli Fu ; Wenhui Lu ; Lingxin Chen
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2013
- 出版时间：January 23, 2013
- 年：2013
- 卷：5
- 期：2
- 页码：284-290
- 全文大小：399K
- 年卷期：v.5,no.2(January 23, 2013)
- ISSN：1944-8252
文摘
A simple colorimetric approach for mercury ion (Hg2+) sensing was developed that was based on the Hg2+-induced deprotection and morphology transition of 1-dodecanethiol (C12H25SH)-capped silver nanoprisms (Ag NPRs) upon the presence of iodides at room temperature. The abstraction of C12H25SH from the surface of Ag NPRs by Hg2+ led to their deprotection of Ag NPRs and the formation of complexation between silver ions and excess iodide ions. Also, the silver atoms were consumed and moved from the surface of Ag NPRs, accompanying the changes in the particle morphology that resulted in a change of color and UV鈥搗is absorption spectra of the colloidal solution. With increasing concentrations of Hg2+ from 10 to 500 nM, the surface plasma resonance spectral band of Ag NPRs emerged as a blue shift and exhibited a good linear relationship, and the limit of detection was 3.3 nM. Furthermore, the developed method was applied for detecting Hg2+ in different real water samples with satisfying recoveries over 92%.