Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
ACS Appl Mater Interfaces. 2013 Jan 23;5(2):284-90. doi: 10.1021/am3020857. Epub 2012 Dec 28.
A simple colorimetric approach for mercury ion (Hg(2+)) sensing was developed that was based on the Hg(2+)-induced deprotection and morphology transition of 1-dodecanethiol (C(12)H(25)SH)-capped silver nanoprisms (Ag NPRs) upon the presence of iodides at room temperature. The abstraction of C(12)H(25)SH from the surface of Ag NPRs by Hg(2+) 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 Hg(2+) 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 Hg(2+) in different real water samples with satisfying recoveries over 92%.
一种简单的比色法用于汞离子（Hg(2+)）检测，该方法基于室温下碘化物存在时，巯基十一烷（C(12)H(25)SH）包裹的银纳米棒（Ag NPRs）表面的巯基十一烷（C(12)H(25)SH）被 Hg(2+) 夺取，导致 Ag NPRs 脱保护，并形成银离子与过量碘离子之间的络合。此外，银原子被消耗并从 Ag NPRs 的表面移动，伴随着颗粒形态的变化，导致胶体溶液的颜色和紫外-可见吸收光谱发生变化。随着 Hg(2+)浓度从 10 到 500 nM 的增加，Ag NPRs 的表面等离子体共振光谱带出现蓝移，并表现出良好的线性关系，检测限为 3.3 nM。此外，该方法还用于检测不同实际水样中的 Hg(2+)，回收率超过 92%。
