Abstract
Anisotropic gold nanoparticles are chemically stable and serve as localized surface plasmon resonance (LSPR) sensors operatable in the first biological optical window (650−950 nm). However, alternative materials are awaited because they are expensive and somewhat complicated to prepare. Here we employ CuS (covellite) nanoplates, which consist of earth-abundant elements and exhibit LSPR in the near-infrared region, as materials for LSPR sensors. The CuS nanoplates respond to refractive index changes of the surrounding medium in the second biological optical window (1000−1350 nm). The refractive index sensitivity (160−600 nm RIU−1) and the operation wavelength (1100−1250 nm) of the CuS nanoplates can be controlled by simply changing the composition of reaction suspension for nanoplate synthesis.
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