Key Laboratory for Organic Electronics and Information Display (KLOEID) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Phys Chem Chem Phys. 2018 Jun 27;20(25):17262-17267. doi: 10.1039/c8cp01990h.
The production of reactive oxygen species (ROS) from graphene oxide quantum dots (GOQDs) and chemically reduced GOQDs (rGOQDs) was studied. This shows that GOQDs and rGOQDs produce ROS including singlet oxygen (1O2), hydrogen peroxide (H2O2) and superoxide anion (O2˙-). Interestingly, the rGOQDs exhibit a higher yield of ROS under white light in comparison with GOQDs, indicating the enhanced photodynamic effect through chemical reduction of GOQDs. Studies on the relation between their structures and the yield of ROS demonstrate that the reduction of GOQDs with hydrazine hydrate decreases the band gap and valence band of GOQDs and results in more electron-hole pairs, which leads to an improvement in the yield of ROS from rGOQDs. This research explores the specific species of ROS generated from GOQDs, and provides an efficient avenue to improve the yield of ROS through surface modification of GOQDs.
研究了氧化石墨烯量子点（GOQDs）和化学还原氧化石墨烯量子点（rGOQDs）产生的活性氧物种（ROS）。结果表明，GOQDs 和 rGOQDs 产生包括单线态氧（1O2）、过氧化氢（H2O2）和超氧阴离子（O2˙-）在内的 ROS。有趣的是，与 GOQDs 相比，rGOQDs 在白光下产生 ROS 的产率更高，这表明通过 GOQDs 的化学还原增强了光动力效应。对它们的结构与 ROS 产率之间关系的研究表明，水合肼还原 GOQDs 降低了 GOQDs 的带隙和价带，导致更多的电子-空穴对，从而提高了 rGOQDs 产生 ROS 的产率。本研究探索了 GOQDs 产生的 ROS 的具体种类，并通过 GOQDs 的表面修饰提供了一种提高 ROS 产率的有效途径。
