Laser & Optoelectronics Progress, Volume. 50, Issue 7, 73005(2013)
Optical Waveguide Spectroscopy for Ultratrace Hg2+ Detection
In order to realize the ultratrace detection of Hg2+ by optical waveguide spectroscopy, a displacement strategy of gold nanoparticles (Au NPs) for target analysis based on the optical waveguide spectroscopy is designed, which differs from the usual target-induced aggregation effect. The PATP-coupled Au nanoparticle (PATP-Au) multilayer was layer-by-layer assembled on the OWG chip surface and used as the probes to detect Hg2+. OWG spectroscopy can monitor the SPR extinction from Au nanoparticles, which enables to easily capture changes in the probe structure. Because Hg2+ has a higher binding affinity to the thiol group of PATP molecules, the presence of Hg2+ will greatly destroy the probe structure, produce large changes in surface plasmon resonance features of the probes. Our experiments indicated a high selectivity for Hg2+ detection and reached a low detection limit of about 1 nM.
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He Shengnan, Ma Yongmei, Li Dandan, Wu Shuai, Liu Jinhuai, Liu Honglin. Optical Waveguide Spectroscopy for Ultratrace Hg2+ Detection[J]. Laser & Optoelectronics Progress, 2013, 50(7): 73005
Category: Spectroscopy
Received: Apr. 1, 2013
Accepted: --
Published Online: Jun. 8, 2013
The Author Email: Shengnan He (cetc38_yanghe@163.com)