Highly Sensitive and Selective Colorimetric Sensing of Hg2+ Based on the Morphology Transition of Silver Nanoprisms
Highly Sensitive and Selective Colorimetric Sensing of Hg2+ Based on the Morphology Transition of Silver Nanoprisms
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基于银纳米棱柱形态转变的 Hg2 高灵敏度和选择性比色传感
DOI：
10.1021/am3020857
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发表时间：
2013-01-23
影响因子：
9.5
通讯作者：
Chen, Lingxin
中科院分区：
文献类型：
--
作者：
Chen, Ling;Fu, Xiuli;Chen, Lingxin
基于汞离子（Hg 2+）的特性，建立了一种简单的汞离子（Hg 2+）比色传感方法。在室温下，在碘化物存在下，1-十二烷乙基（C12 H25 SH）封端的银纳米棱柱（Ag NPR）的诱导脱保护和形态转变。Hg ~（2+）对Ag NPR表面的C_（12）H_（25）SH的夺取导致Ag NPR的脱保护，并使银离子与过量的碘离子形成络合物。此外，银原子被消耗并从Ag NPR表面移动，伴随着颗粒形态的变化，导致胶体溶液的颜色和紫外-可见吸收光谱的变化。随着Hg 2+浓度从10增加到500 nM，Ag NPRs的表面等离子体共振谱带出现蓝移，并表现出良好的线性关系，检测限为3.3 nM。将该方法应用于不同真实的水样中Hg 2+的测定，回收率在92%以上。
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-vis 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%.