光致发光
石墨烯
水溶液
材料科学
激光烧蚀
掺杂剂
纳米材料
光化学
量子点
催化作用
纳米技术
兴奋剂
无机化学
化学工程
化学
激光器
光电子学
有机化学
光学
物理
工程类
作者
Rosemary L. Calabro,Dong‐Sheng Yang,Doo Young Kim
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2019-10-07
卷期号:2 (11): 6948-6959
被引量:52
标识
DOI:10.1021/acsanm.9b01433
摘要
Nitrogen-doped graphene quantum dots (N-GQDs) have promising applications in catalysis and photoluminescence, but many existing synthetic methods require uses of harsh chemicals, long reaction times, and complicated purification steps and have poor control over the surface functional groups. Laser ablation in liquid (LAL) is a promising alternative method to prepare nanomaterials because of its fast production, use of fewer chemicals, simple purification, and fewer byproducts and its control of the product by precise tuning of laser ablation parameters. We report the use of LAL to produce N-GQDs from carbon nano-onions in aqueous solutions of ammonia, ethylenediamine, and pyridine. The choice of these dopants allowed for tuning the overall nitrogen content and the distribution of functional groups that led to the control over the photoluminescence emission wavelengths and lifetimes. High concentrations of amine groups tended to red-shift emission and exhibit shorter lifetimes, whereas pyridinic groups would blue-shift the emission and exhibit longer lifetimes. The N-GQDs also showed a promising performance as electrocatalysts for reducing oxygen to hydrogen peroxide, an important chemical widely used in industrial applications. The N-GQDs exhibited both low overpotentials and high selectivity for a two-electron oxygen reduction pathway.
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