材料科学
光致发光
量子点
可见光谱
发光
石墨烯
兴奋剂
吸收(声学)
激发
光电子学
杂原子
光致发光激发
光化学
绿灯
吸收光谱法
纳米技术
光学
蓝光
化学
有机化学
物理
工程类
复合材料
电气工程
戒指(化学)
作者
Dan Qu,Zaicheng Sun,Min Zheng,Jing Li,Yongqiang Zhang,Guoqiang Zhang,Haifeng Zhao,Xingyuan Liu,Zhigang Xie
标识
DOI:10.1002/adom.201400549
摘要
A facile solvothermal route to synthesize S,N co‐doped graphene quantum dots (S,N‐GQDs) with unique optical properties is demonstrated. Three absorption bands are observed at 338, 467, and 557 nm, which is different from any previous reports. The photoluminescent spectra display emissions in three primary colors that are independent of the excitation wavelength, within the excitation wavelength ranges of 340–420 nm, 460–540 nm, and 560–620 nm. The PL excitation spectra indicate that each emission is related to a single excitation band. It is proposed that three independent luminescent centers coexist in S,N‐GQDs because the doping with S and N may change the chemical environment of the GQDs. However, energy‐transfer processes usually do not occur among the independent luminescent centers under different wavelength light excitation. Heteroatom‐doping of GQDs provides an attractive means of effectively tuning their optical properties for the purpose of exploiting new applications in visible‐light photocatalytic and bioimaging. S,N‐GQDs/TiO 2 composites exhibit better hydrogen production activities under visible light ( λ > 420 nm) than commercial TiO 2 (P25), owing to the presence of characteristic absorption bands in the visible region. Furthermore, the S,N‐GQDs have a pronounced biocompatibility and bioimaging ability under long‐wavelengths excitation for live A549 cells.
科研通智能强力驱动
Strongly Powered by AbleSci AI