| 초록 |
Yellow-emissive polyphenolic carbon quantum dots (Y-CQDs) with discernible edges were synthesized. Three-fold-symmetric benzene-1,3,5-triol was a suitable precursor for synthesis of CQDs in sulfuric acid within 90 min of a thermal reaction at 190 °C. Binary heterostructure nanocomposites, comprising CdS-nanorods (NRs) and Y-CQDs, were prepared. The nanocomposite with 6 wt.% YCQDs (CdS@Y-CQDs-6) exhibited the highest enhanced photocatalytic degradation of rhodamine B (RhB) with a degradation efficiency of 98% within 45 min, and the degradation rate constant was ~4.8 times higher than that of pristine CdS-NRs. The degradation performance of CdS@Y-CQDs nanocomposites is attributed to the formation of near-surface heterojunction of surface-adsorbed specific-shaped Y-CQDs, which can widen the range of light absorption and promote the separation of photogenerated electron-hole pairs in CdS-NRs by trapping and boosting the transfer of photo excited charge carriers over the surface. |
