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为了实现利用光波导(OWG)分光光谱检测痕量二价汞离子(Hg2+),本文设计了一种基于Au纳米颗粒取代原理的光波导检测方法。不同于传统的光波导分光光谱检测手段,该方法采用对巯基苯胺(PATP)分子对Au纳米粒子进行修饰,并组装到光波导的表面,形成三维的Au纳米颗粒光波导表面消逝场探针。实时检测光波导探针的表面等离子体(SPR)共振吸收峰,当Hg2+存在时,Hg2+会取代Au纳米颗粒并与PATP的巯基进行配位结合使得Au颗粒表面的Au-S键断裂,从而引起光波导分光光谱的变化。该方法使光波导分光光谱检测实现了纳摩尔量级的高灵敏度以及选择性检测。
In order to realize the trace mercury ion (Hg2 +) detection using optical waveguide (OWG) spectroscopy, an optical waveguide detection method based on the substitution principle of Au nanoparticles was designed. Different from the traditional optical waveguide spectroscopy, this method uses Au nanoparticles modified by the mercaptoaniline (PATP) molecule and is assembled on the surface of the optical waveguide to form a three-dimensional Au nanoparticle optical waveguide surface evanescent field probe. Real-time detection of surface plasmon resonance (SPR) absorption peak of optical waveguide probe, when Hg2 + is present, Hg2 + will replace Au nanoparticles and coordinate with the sulfhydryl group of PATP to break the Au-S bond on the surface of Au particles, Optical waveguide spectroscopy changes. The method enables optical waveguide spectroscopic detection to achieve high sensitivity and selective detection on the nanomolar scale.