Abstract
A facile, highly sensitive and selective colorimetric strategy for thiocyanate (SCN−) detection is proposed based on anti-aggregation of gold nanoparticles (AuNPs) which was induced by surfactant cetyltrimethyl ammonium bromide (CTAB). A certain concentration of aggregation agent CTAB is responsible for a visible color change of AuNPs from wine red to blue. The aggregations of AuNPs decrease with increasing concentrations of SCN−, which can be monitored by an ultraviolet–visible spectrophotometer or the naked eyes. The limit of the detection (LOD) is 0.1μM by the naked eyes and 6.5nM by UV–vis spectroscopy with the linear range from 0.1 to 1.5μM. The applicability of our detection system is also verified by analysis of SCN− in milk samples and satisfactory results were obtained.
Published Version
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