Preparation of a silver nanoparticle-based dual-functional sensor using a complexation-reduction method

Fwu Long Mi, Shao Jung Wu, Wen Qi Zhong, Cheng Yu Huang

研究成果: 雜誌貢獻文章同行評審

38 引文 斯高帕斯(Scopus)


A dual-functional sensor based on silver nanoparticles was synthesized by a two-stage procedure consisting of a low-temperature chitosan-Ag+ complexation followed by a high-temperature reduction of the complex to form chitosan-capped silver nanoparticles (CS-capped Ag NPs). The surface plasmon resonance (SPR) absorption and fluorescence emission of the silver nanoparticles were influenced by the concentration and degradation time of chitosan, and the temperatures of the complexation and reduction reactions. The SPR absorption band was blue-shifted while the intensities of emission and absorption were decreased after reacting the silver nanoparticles with Hg2+ ions. The silver nanoparticles reacted with Hg2+ were characterized by high resolution transmission electron microscopy (HRTEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and surface-enhanced Raman scattering spectroscopy (SERS). The results suggested that the particle growth and aggregation of the silver nanoparticles were caused by the adsorption of Hg2+ and deposition of Hg0 on the nanoparticle surface. Direct correlations of the SPR absorption and fluorescence emission with the concentration of Hg2+ were useful for quantitative analysis of Hg2+. It was possible to use the dual-functional silver nanoparticles as a colorimetric and fluorescent sensor for sensitive and selective detection of Hg2+ ions.

頁(從 - 到)21243-21253
期刊Physical Chemistry Chemical Physics
出版狀態已發佈 - 1月 19 2015

ASJC Scopus subject areas

  • 一般物理與天文學
  • 物理與理論化學


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