Figure 5: Improved SERS properties of W18O49 samples after Ar/H2 annealing treatment.
From: Noble metal-comparable SERS enhancement from semiconducting metal oxides by making oxygen vacancies
(a) Raman signals of R6G molecule on pristine W18O49 and the samples after annealing treatment (in Ar/H2 at 300 °C for 1 h). The tested concentration of R6G was 1 × 10−6 M. (b) A comparison of Raman EF for the two respective vibration modes P1 and P3. Data reported in this histogram resulted from Raman spectra acquired over 30 different regions per sample and provide an indication of the EF for each Raman mode. The H2-treated sample shows the greatest enhancement at band P1, the EF for which was evaluated to be 3.4 × 105.
