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We report the application of borrowed SERS to SERS-inactive SiO2, which is achieved by coating an ultrathin, pinhole-free SiO2 layer on a roughened Au electrode. The ultrathin SiO2 layer allows the transfer of the long-range electromagnetic fields created by the underlying Au to the SiO2 surface, achieving SERS therein (i.e., borrowed SERS). The pinhole-free nature of the SiO2 layer avoids spectral...
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