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Atomically thin boron nitride (BN) nanosheets have been found an excellentsubstrate for noble metal particles enabled surface enhanced Raman spectroscopy(SERS), thanks to their good adsorption of aromatic molecules, high thermalstability and weak Raman scattering. Faceted gold (Au) nanoparticles have beensynthesized on BN nanosheets by a simple but controllable and reproduciblesputtering and annealing method. The size and density of the Au particles canbe controlled by sputtering time, current and annealing temperature etc. Underthe same sputtering and annealing conditions, the Au particles on BN ofdifferent thicknesses show various sizes because the surface diffusioncoefficients of Au depends on the thickness of BN. Intriguingly, decorated withsimilar morphology and distribution of Au particles, BN nanosheets exhibitbetter Raman enhancements than silicon substrate as well as bulk BN crystals.Additionally, BN nanosheets show no noticeable SERS signal and hence cause nointerference to the Raman signal of analyte. The Au/BN substrates can be reusedby heating in air to remove adsorbed analyte without loss of SERS enhancement.

Boron Nitride Nanosheets as Improved and Reusable Substrates for Gold Nanoparticles Enabled Surface Enhanced Raman Spectroscopy