Development of silver/gold nanocages onto indium tin oxide glass as a reagentless plasmonic mercury sensor.
We demonstrate the utilization of silver/gold nanocages (Ag/Au NCs) deposited onto transparent indium tin oxide (ITO) film glass as the basis of a reagentless, simple and inexpensive mercury probe. The localized surface plasmon resonance (LSPR) peak wavelength was located at ∼800 nm. By utilizing the redox reaction between Hg(2+) ions and Ag atoms that existed in Ag/Au NCs, the LSPR peak of Ag/Au NCs was blue-shifted. Thus, we develop an optical sensing probe for the detection of Hg(2+) ions. The LSPR peak changes were lineally proportional to the concentration of Hg(2+) ions over the range from 10 ppb to 0.5 ppm. The detection limit was ∼5 ppb. This plasmonic probe shows good selectivity and high sensitivity. The proposed optical probe is successfully applied to the sensing of Hg(2+) in real samples.
The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, PR China.
Daodan
D
Huang
The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, PR China.
Tingting
T
Hu
The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, PR China.
Na
N
Chen
Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China. Electronic address: zhangwei@cigit.ac.cn.
Wei
W
Zhang
The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, PR China. Electronic address: djw@suda.edu.cn.
Junwei
J
Di
D005898:Glass / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D049329:Nanostructures / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*; D017971:Tin Compounds / Q000737:chemistry*
D017971:Tin Compounds; D012834:Silver; C109984:indium tin oxide; D006046:Gold; D008628:Mercury
Localized surface plasmon resonance; Mercury; Optical sensor; Silver/gold nanocage