Ultrafast ammonia-driven, microwave-assisted synthesis of nitrogen-doped graphene quantum dots and their optical properties

Nanophotonics

article

Binjie Zheng¹  Yuanfu Chen¹  Pingjian Li¹  Zegao Wang²  Bingqiang Cao³  Fei Qi¹  Jinbo Liu¹  Zhiwen Qiu³  Wanli Zhang¹ 

[1] State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China;Interdisciplinary Nanoscience Center, Aarhus University (iNANO);School of Materials Science and Engineering, University of Jinan

关键词: nitrogen-doped;    graphene quantum dots;    ultrafast synthesis;    fluorescence nanophotonics;   

DOI  :  10.1515/nanoph-2016-0102

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

For the first time, a facile, ultrafast, ammonia-driven microwave-assisted synthesis of high-quality nitrogen-doped graphene quantum dots (NGQDs) at room temperature and atmospheric pressure is presented. This one-step method is very cheap, environment friendly, and suitable for large-scale production. The as-synthesized NGQDs consisting of one to three graphene monolayers exhibit highly crystalline quality with an average size of 5.3 nm. A new fluorescence (FL) emission peak at 390 nm is observed, which might be attributed to the doped nitrogen atoms into the GQDs. An interesting red-shift is observed by comparing the FL excitation spectra to the UV-visible absorption spectra. Based on the optical properties, the detailed Jablonski diagram representing the energy level structure of NGQDs is derived.

【 授权许可】

CC BY