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Correlated SERS and LSPR redshifts during photocatalytic CO2RR. (a) LSPR peak shift measured with DF spectroscopy of a single Ag ND during pretreatment in N2 and during photocatalytic CO2RR in a 60:40 CO2/H2 mixture under 532 nm laser irradiation at 1 mW/μm2. (b) SERS signal measured during the laser irradiation (left) before the onset of surface restructuring and (right) during surface restructuring showing strong intermittent Stokes emission.
