Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China.
ACS Nano. 2012 Feb 28;6(2):1059-64. doi: 10.1021/nn2040395. Epub 2012 Jan 12.
A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO(2)/GQD and anatase TiO(2)/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO(2)/GQD complex system is ca. 9 times larger than that of the anatase TiO(2)/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue.
本文提出了一种简便的超声法制备上转换发射的石墨烯量子点（GQDs）的方法。所制备的 GQDs 表现出与激发无关的下转换和上转换光致发光（PL）行为，并且设计了复杂的光催化剂（金红石 TiO2/GQD 和锐钛矿 TiO2/GQD 体系）以利用太阳光的可见光光谱。有趣的是，在可见光（λ>420nm）照射下，金红石 TiO2/GQD 复合体系的光催化速率约是锐钛矿 TiO2/GQD 复合体系的 9 倍，在亚甲基蓝的降解中。
