期刊
ACS SENSORS
卷 5, 期 3, 页码 645-649出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b02404
关键词
Nonlinear plasmonic sensing; mercury sensing; SHG; TPRS; nonlinear spectroscopy; nanorods
资金
- Science and Engineering Research Board, Government of India [EMR/2016/001605]
- Ministry of Human Resource Development, Government of India
- Indian Council of Medical Research Government of India
We present the concept of a nonlinear plasmonic sensing approach for rapid, sensitive, and label-free detection of mercury. Nonlinear plasmonic sensing of mercury relies on a systematic combination of nonlinear optics (NLO) with well-known concepts of amalgamation chemistry and plasmonic properties of gold nanorods. Exploiting the extreme sensitivity of the NLO process toward Hg-induced change in the local electric field of plasmonic nanorods, we succeed in improving the limit of detection (LOD) of mercury by 2-3 orders of magnitude as compared to the commonly used linear localized surface plasmon resonance (LSPR) based sensing. Using our method, an LOD of as low as 58 pM (11 ppt) has been achieved with high selectivity. Nonlinear plasmonic sensing aproach is found to work excellently for detecting mercury in real samples like blood plasma.
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