发光
微波食品加热
热液循环
纳米材料
材料科学
微波化学
吸收(声学)
纳米技术
分析化学(期刊)
化学工程
碳纤维
化学
光电子学
有机化学
复合材料
工程类
物理
复合数
量子力学
微波辐射
作者
Yinghui Liu,Dandan Guo,Ying Gao,Bihai Tong,Li Yu,Yuezhao Zhu
标识
DOI:10.1016/j.apsusc.2021.149503
摘要
Carbon dots (CDs) is a burgeoning nanomaterial; in particular, those derived from biomass are more sustainable, economical and eco-friendly. The microwave-assisted hydrothermal (MHTC) method was increasingly used to prepare biomass-based CDs as a new green technology. However, the non-thermal effect of microwave remains controversial. In this work, the microwave non-thermal effect in MHTC preparation of CDs from soymeal (S-CDs) was confirmed through comparative experiments between microwave-assisted and conventional hydrothermal (HTC) method. S-CDs prepared by the MHTC method obtained higher relative proportions of self-doping nitrogen, pyridine N, amine N, quaternary N and conjugate sp2 C than that by the HTC method for the microwave non-thermal effect, which led to stronger luminescence and red shifts of the absorption and emission. The optimization effect of microwave non-thermal action on S-CDs structure and luminescence performance would not disappear with reaction temperature and residence time. The luminescence intensities of S-CDs obtained by the MHTC method were all stronger than that by the HTC method among the different reaction conditions. The performance optimization caused by microwave non-thermal effect could be briefly explained as macroscopic luminescence enhancement due to more fluorescent carbon nano-particles and microscopic luminescence enhancement due to the formation of key luminescence chemical structures.
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