Ye Ruquan, Peng Zhiwei, Metzger Andrew, Lin Jian, Mann Jason A, Huang Kewei, Xiang Changsheng, Fan Xiujun, Samuel Errol L G, Alemany Lawrence B, Martí Angel A, Tour James M
||College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China.
ACS Appl Mater Interfaces. 2015 Apr 1;7(12):7041-8. doi: 10.1021/acsami.5b01419. Epub 2015 Mar 19.
Bandgaps of photoluminescent graphene quantum dots (GQDs) synthesized from anthracite have been engineered by controlling the size of GQDs in two ways: either chemical oxidative treatment and separation by cross-flow ultrafiltration, or by a facile one-step chemical synthesis using successively higher temperatures to render smaller GQDs. Using these methods, GQDs were synthesized with tailored sizes and bandgaps. The GQDs emit light from blue-green (2.9 eV) to orange-red (2.05 eV), depending on size, functionalities and defects. These findings provide a deeper insight into the nature of coal-derived GQDs and demonstrate a scalable method for production of GQDs with the desired bandgaps.
通过两种方式控制由无烟煤合成的光致发光石墨烯量子点（GQD）的尺寸，从而对其带隙进行了调控：一种是化学氧化处理并通过错流超滤进行分离，另一种是采用简便的一步化学合成法，通过逐步升高温度来制备尺寸更小的GQD。利用这些方法，合成出了具有特定尺寸和带隙的GQD。GQD根据尺寸、官能团和缺陷的不同，发出从蓝绿色（2.9电子伏特）到橙红色（2.05电子伏特）的光。这些发现为煤衍生GQD的本质提供了更深入的见解，并展示了一种可扩展的方法来生产具有所需带隙的GQD。
