研究目的
Introducing a nonlinear plasmonic sensing approach for label-free and facile detection of Hg2+ with high sensitivity and selectivity.
研究成果
The nonlinear plasmonic based method allows for label-free and facile detection of Hg with picomolar level sensitivity and high selectivity. The method is suitable for detecting trace levels of Hg in real samples, including biological specimens like blood plasma.
研究不足
The sensitivity level is dependent on the size parameters of the GNRs, and smaller nanorods are preferable for detecting ultralow levels of Hg, while larger nanorods are better for quantifying large concentrations of mercury.
The methodology involves a combination of nonlinear optics with amalgamation chemistry and plasmonic properties of gold nanorods. Gold nanorods (GNRs) are synthesized following a seed-mediated growth procedure. The synthesized GNRs are subjected to different concentrations of Hg(0), prepared by reduction of Hg(II) by NaBH4 in situ. The LSPR spectra of GNRs are recorded as a function of mercury concentrations. The nonlinear plasmonic sensing scheme relies on monitoring the Hg-induced changes of plasmonic electric fields by detecting the second harmonic generation (SHG) from gold nanorods using two-photon Rayleigh scattering (TPRS), as a function of mercury concentration.
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