Solid-Phase Colorimetric Sensing Platform for Bromide ions Based on a Tough Hydrogel Embedded with Silver Nanoprisms
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Triangular silver nanoprisms with sharp corners exhibit fascinating optical properties, but their shapes make them thermodynamically unstable. Thus, these shapes cannot be used for sensing applications because of their tendency to aggregate or transform in a solution state. In this study, we used this intrinsic instability to develop a colorimetric and naked-eye sensing system for detecting bromide ions (Br-) in an aqueous medium based on the localized surface plasmon resonance (LSPR) properties of Ag nanoprisms with sharp tips. Our solid-phase hydrogel sensing platform can successfully determine a wide range of bromide ion concentrations based on the rate of change of the color and spectral features. In particular, compared to the solution state sensing system, our hydrogel based colorimetric solid sensor showed several advantages for detecting bromide ions. Therefore, our findings suggest that the as-proposed sensing platform shows an outstanding potential analytical tool.