期刊
MICROCHIMICA ACTA
卷 181, 期 1-2, 页码 105-110出版社
SPRINGER WIEN
DOI: 10.1007/s00604-013-1075-7
关键词
Colorimetric assay; Copper ions; Silver-coated gold nanorods; Catalytic leaching
资金
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- National Natural Science Foundation of China [21275158]
- Chinese Academy of Sciences
We have developed a method for the colorimetric determination of copper ions (Cu2+) that is based on the use of silver-coated gold nanorods (Au@Ag NRs). Its outstanding selectivity and sensitivity result from the catalytic leaching process that occurs between Cu2+, thiosulfate (S2O3 (2-)), and the surface of the Au@Ag NRs. The intrinsic color of the Au@Ag NRs changes from bright red to bluish green with decreasing thickness of the silver coating. The addition of Cu2+ accelerates the leaching of silver from the shell caused in the presence of S2O3 (2-). This result in a decrease in the thickness of the silver shell which is accompanied a change in color and absorption spectra of the colloidal solution. The shifts in the absorption maxima are linearly related to the concentrations of Cu2+ over the 3-1,000 nM concentration range (R = 0.996). The method is cost effective and was applied to the determination of Cu2+ in real water samples.
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