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A label-free non-aggregation colorimetric sensor has been designed for the detection of Cu 2+ , based on Cu 2+ catalyzing etching of gold nanorods (AuNRs) along longitudinal axis induced by dissolve oxygen in the presence of S 2 O 32− , which caused the aspect ratio (length/width) of AuNRs to decrease and the color of the solution to distinctly change. The linear...
I − could accelerate the selective etching along longitudinal direction of gold nanorods (AuNRs) induced by Fe 3+ in HCl medium, which decreased the aspect ratio (length/width) of AuNRs, and thus the longitudinal surface plasmon resonance (LSPR) absorption peaks of AuNRs blue shifted (Δλ=λ 0 −λ), the corresponding absorbance decreased (ΔA=A 0 −A), and the color of the...
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