The N adsorption minus desorption isotherms in Fig were

3.5. N2 adsorption/desorption
Fig. 5. Nitrogen adsorption-desorption isotherms and the corresponding pore-size distribution curves (inset) for the samples (a) ZnO and (b) ZnO-rGO.Figure optionsDownload full-size imageDownload as PowerPoint slide
3.6. Optical characterization
The change of SB705498 or energy transfer between ZnO and rGO was detected by photoluminescence (PL) measurements. Fig. 6(a) shows the PL spectra of ZnO and ZnO-10%rGO. ZnO displays a broad PL emission peak at around 603 nm. As expected, ZnO-10%rGO shows a significant decrease in the intensity of PL compared to ZnO. The weaker intensity of the peak represents the lower recombination probability of free charges, which indicates that coupling with rGO can effectively mitigate the recombination of photogenerated electron-hole pairs of ZnO [20] and [29].
Fig. 6. (a) PL spectra of ZnO and ZnO-10%rGO, (b) UV–vis diffuse reflectance spectra (DRS) of the samples of ZnO and ZnO-rGO.Figure optionsDownload full-size imageDownload as PowerPoint slide