The bulk sensitivity of the Au@Cu 2− x S CSNs shows an increasing trend that meets a double-exponential curve with increasing shell thickness, which is due to the double LSPR supported by core and shell that greatly increase the LSPR red-shift to entire near-infrared area.
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Double-exponential refractive index sensitivity of metal-semiconductor core-shell nanoparticles: the effects of dual-plasmon resonances and red-shift.
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