Efficient electron transfer in CdSe quantum dots-decorated reduced graphene oxide for electromagnetic interference shielding application

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Bulletin of Materials Science Pub Date : 2024-06-04 DOI:10.1007/s12034-024-03240-1

Amar Nath Yadav, Shiva Upadhyay, Ashwani Kumar Singh, Kedar Singh

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Abstract

Effective charge separation and use of hot charge carriers are considered to be the most essential factors affecting the activity of an excellent energy harvester. Herein, we have successfully decorated 3 nm of CdSe quantum dots (QDs) on the surface of reduced graphene oxide (rGO) using solvothermal method. Formation of CdSe–rGO nanocomposite (NC) has been confirmed by X-ray diffraction pattern, transmission electron microscopy and Raman analysis. Further, the emission spectrum of CdSe–rGO NC shows quenching of emission of CdSe QDs on the surface of rGO nanosheet. To elucidate this phenomenon, we have carried out time-correlated single-photon counting (TCSPC) measurements, which reveal efficient electron transfer, as the exciton lifetime of CdSe QDs in the NC is significantly reduced compared to bare CdSe QDs. Owing to the efficient electron transfer, this NC showed big boost in total shielding effectiveness (SE_T = 29 dB) when compared to graphene (SE_T = 23 dB) in electromagnetic interference shielding application.

Graphical abstract

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掺硒镉量子点装饰还原氧化石墨烯中的高效电子传递在电磁干扰屏蔽中的应用

有效的电荷分离和热电荷载流子的利用被认为是影响优秀能量收集器活性的最基本因素。在此，我们采用溶热法成功地在还原氧化石墨烯（rGO）表面装饰了 3 nm 的碲化镉量子点（QDs）。X 射线衍射图谱、透射电子显微镜和拉曼分析证实了 CdSe-rGO 纳米复合材料（NC）的形成。此外，CdSe-rGO NC 的发射光谱显示，CdSe QDs 在 rGO 纳米片表面的发射被淬灭。为了阐明这一现象，我们进行了时间相关单光子计数（TCSPC）测量，结果表明，与裸 CdSe QDs 相比，NC 中 CdSe QDs 的激子寿命显著缩短，从而实现了高效的电子转移。由于电子转移效率高，在电磁干扰屏蔽应用中，与石墨烯（SET = 23 dB）相比，这种 NC 的总屏蔽效能大幅提高（SET = 29 dB）。

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来源期刊

Bulletin of Materials Science 工程技术-材料科学：综合

CiteScore

3.40

自引率

5.60%

发文量

209

审稿时长

11.5 months

期刊介绍： The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.

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