LAUSR

Porous Ag‐CuO nanocomposites are prepared with a photochemical reduction method. The obtained Ag‐CuO nanocomposites have bifunctions; they can not only be used as surface‐enhanced Raman scattering (SERS) substrates, providing an enhancement factor of 3.86 × 107 toward rhodamine 6G (R6G) and 7.08 × 107 toward p‐aminothiophenol, but also can be used as an effective photocatalyst to degrade dyes, including R6G with H2O2 under light irradiation. For example, the Ag‐CuO nanocomposite can degrade 96.7% of R6G within 2 h. It is believed that the porous microstructure provides more “hot‐spots” for SERS and active sites for photocatalytic process, inducing excellent performance. Due to the bifunctions, reuse of the Ag‐CuO SERS substrate is demonstrated with the assistance of light irradiation cleaning process. After eight reuse cycles, the enhancement factor of the substrate to R6G is still retained at 1.45×105.