电化学
氧化还原
碳纤维
光化学
阳极
荧光
石墨
电极
化学
吸收(声学)
电解
材料科学
离子
阴极
无机化学
物理化学
光学
有机化学
复合材料
物理
复合数
电解质
作者
Jinli Li,Chengxiang Sun,Qiang Li,Xiaoxue Xu,Baolin Li,Honglang Li,Dianyuan Zheng,Rongbin Yao,Kang Yuan,Ziyang Guo
标识
DOI:10.1002/cssc.202401313
摘要
Carbon dots (CDs) still suffer from unclear surface state fluorescence mechanism for fine modulation. Here, redox reactions for cathode and anode within electrochemical method are firstly employed to construct differentiated strategy for surface‐state modulation, so as to obtain CDs with controllable emission in separated electrodes simultaneously. The fluorescence peaks of CDs from blue to red centered at 425 nm (mCDs‐), 530 nm (mCDs+), 580 nm (oCDs‐) and 665 nm (oCDs+) are mainly originated from the different bombardment effects of the ions and reaction tendencies of modifier during the electrolysis process. The phenylenediamine (as modifier) tends to introduce the amino groups on the surface of CDs‐ while introduced nitrogen atoms into the carbon nucleus skeleton around the anode, thus leading to much larger size and the formation of the graphite N for CDs+. It is the different surface states formed by phenylenediamine and the absorption redshift triggered by graphite N that ensures the tunable emission. The improved electrochemical method is of great significance for finely spectra modulation and efficient synthesis.
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