Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 2, Pages 284-290Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am3020857
Keywords
mercury ions; calorimetric detection; silver nanoprism; morphology transition
Funding
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- National Natural Science Foundation of China [21275158]
- Innovation Projects of the Chinese Academy of Sciences [KZCX2-EW-206]
- 100 Talents Program of the Chinese Academy of Sciences
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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%.
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