Gold nanoparticle (AuNP) exhibits unique surface plasmon resonances, which is susceptible to several parameters like particle size and shape, inter-particle distance, and local dielectric environment of nanoparticles. In this study, a melamine-AuNPs system was fabricated for colorimetric detection of mercury ion based on the selective binging behavior of melamine toward mercury. The plasmon band of melamine-AuNP (13 nm) in water media is centered on 520 nm, while aggregated AuNP solution shows obvious red-to-blue color changes with blue-shifted absorption bond to 650 nm with introduction of mercury ion. This system shows good selectivity and sensitivity to mercury ion among heavy and transition metal ions. The result in this study can provide qualitative and quantitative determination by colorimetric changes for mercury content, which shows important significance in water environmental monitoring.

Colorimetric detection of mercury ion based on gold nanoparticle

248th National Meeting (2014)

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