Citation: HU Jia-Jie, ZHU Yuan, SONG Hua-Ju, WANG Ying, SHAN Yun. Electrochemiluminescence from CdS Nanocrystals@Carbon Dots Composite Film[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(2): 324-332. doi: 10.11862/CJIC.2020.034 shu

Electrochemiluminescence from CdS Nanocrystals@Carbon Dots Composite Film

Nanjing Key Laboratory of Advanced Functional Materials, Nanjing Xiaozhuang University, Nanjing 211171, China

Corresponding author: SHAN Yun, yshan@njxzc.edu.cn
Received Date: 18 September 2019
Revised Date: 11 November 2019

Figures(11)

Carbon dots (CDs) were prepared by pyrolysis of citric acid and composited with uncapped CdS nanocrystals (NCs) via ultrasonication to obtain CdS NCs@CDs composite. The cathodic electrochemiluminescence (ECL) from CdS NCs@CDs composite film was studied, and the mechanism underlying the ECL enhancement of CdS NCs film by CDs as well. The results showed that CDs were well dispersive and of 1.5~4 nm in diameter. When the volume ratio of CDs to CdS NCs with averagely size of 4 nm was 2:3, the CdS NCs@CDs composite showed the strongest photoluminescence (PL) which originated from CDs under excitation of 360 nm. Simultaneously, the composite film generated the strongest ECL emission ascribed to excited CdS NCs. The composite film had a more positive set on potential (-1.05 V) for ECL generation. ECL emission of the composite film was pH dependent with the maximum ECL emission occurring at pH=6, meanwhile ECL was 19 times larger than that of CdS NCs film. This ECL enhancement was possibly because a large number of electrons can be trapped in CDs to generate localized electric field that facilitates formation and relaxation of excited states of neighboring CdS NCs.
- semiconductors,
- carbon,
- nanoparticles,
- composite,
- electrochemiluminescence
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