Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission
Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission
复制标题
碳量子点边缘基团修饰对荧光发射的影响
DOI：
10.1186/s11671-019-3079-7
复制
发表时间：
2019-09
影响因子：
--
通讯作者：
Xu Wen
中科院分区：
文献类型：
--
作者：
Tang Ju;Zhang Jin;Zhang Yunfei;Xiao Yiming;Shi Yanli;Chen Yunhua;Ding Lan;Xu Wen
我们详细研究了碳量子点边缘官能团调制对碳量子点荧光的影响。通过柠檬酸与NH3H2O、H2SO4、H3PO4的混合热解，合成了N、S、P元素附着的CQDs。这样，CQDs边缘的部分-COOH可以转化为-C =O， -NH2、-SO2、-HSO3、- h2po4等官能团可以连接到碳键上。我们发现N/S/P-CQDs的形成可以减少附着在这些CQDs中心sp2共轭π结构域边缘的-COOH的数量。这种效应可以减少这些CQDs中电子跃迁的非辐射复合。因此，CQDs的荧光量子产率（QY）可以有效地提高。我们通过实验证明，N/S/P-CQDs的QYs可分别达到18.7%，29.7%和10.3%，而没有官能团调制的QYs为9%。本研究为提高荧光CQDs的光学性能提供了一种实用的实验方法。
We present a detailed investigation on the effect of functional group modulation at the edges of carbon quantum dots (CQDs) on the fluorescence from the CQDs. The CQDs attached by N, S, and P elements are synthesized via pyrolysis of a mixture of citric acid and NH3H2O, H2SO4, and H3PO4, respectively. Thus, part of –COOH at the edges of CQDs can be converted into –C=O and functional groups such as –NH2, –SO2, –HSO3, and –H2PO4can connect to the carbon bonds. We find that the formation of the N/S/P-CQDs can reduce the amount of –COOH that attaches to the edges of sp2-conjugatedπ-domains located at centers of these CQDs. This effect can result in the reduction of the non-radiative recombination for electronic transition in these CQDs. As a result, the quantum yield (QY) for fluorescence from the CQDs can be efficiently enhanced. We demonstrate experimentally that the QYs for N/S/P-CQDs can reach up to 18.7%, 29.7%, and 10.3%, respectively, in comparison to 9% for these without functional group modulation. This work can provide a practical experimental approach in improving the optical properties of fluorescent CQDs.
登录
查看更多内容
影响因子：
5.3
作者：
通讯作者：
--
一种基于新型荧光碳量子点的多功能比率纳米传感方法，可灵敏准确地检测 Hg2 和生物硫醇
影响因子：
4.3
作者：
Huili Fu;Zhongyin Ji;Xuejie Chen;Anwei Cheng;Shucheng Liu;Peiwei Gong;Guoliang Li;Guang Chen;Zhiwei Sun;Xianen Zhao;Feng Cheng;Jinmao You
通讯作者：
Jinmao You
影响因子：
4.6
作者：
Bhunia, Susanta Kumar;Saha, Arindam;Maity, Amit Ranjan;Ray, Sekhar C.;Jana, Nikhil R.
通讯作者：
Jana, Nikhil R.
影响因子：
4.9
作者：
Wang, Fu;Chen, Yong-hua;Ma, Dong-ge
通讯作者：
Ma, Dong-ge
影响因子：
64.8
作者：
Chen, Chi-Fan;Park, Cheol-Hwan;Wang, Feng
通讯作者：
Wang, Feng