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The surface‐enhanced Raman scattering (SERS) of molecules on TiO2 (Degussa P25) was investigated. The variation of trap density was carried out by the calcination of TiO2 at 350, 450 and 600°C. We found that the SERS intensity increases first, and then decreases with the calcination temperature rising from 350 to 450°C and 450 to 600°C, respectively. The measurements indicate that the trap density...
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