Shape Evolution of Triangular Silver Nanoplates by a Non-halide Etchant and Its Application in Melamine Sensing
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초록
내용
Triangular Ag nanoplates are intrinsically unstable, and this characteristic has been a challenging platform in the development of a novel sensing. In the current work, instead of using halide ions as etchants, we used sodium 4-vinylbenzenesulfonate (Na-VBS) as a new powerful etchant of triangular Ag nanoplates. When aged with Na-VBS at room temperature, Na-VBS etched Ag nanoplates nearly as powerfully as halides did, and these nanoplates rapidly transformed into oblate nanospheroids. Interestingly, passivation of the Ag nanoplate surface with melamine was shown to protect the nanoplates from Na-VBS-induced etching. The rate of change of the color and spectral features of the Ag nanoplate solution exposed to Na-VBS was found to be strongly correlated with the concentration of melamine in the solution. This association allowed us to apply this system to the development of a novel platform for sensing melamine.