Fabrication and chemical modification of carbon nanodots/monolayer hexagonal boron nitride/substrate heterostructures and their terahertz optoelectronic properties

作者全名："Wen, Hua; Wang, Boyang; Cheng, Xingjia; Song, Dan; Xiao, Huan; Xu, Wen; Lu, Siyu"

作者地址："[Wen, Hua; Cheng, Xingjia; Xu, Wen; Lu, Siyu] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China; [Wen, Hua; Cheng, Xingjia] Univ Sci & Technol China, Hefei 230026, Peoples R China; [Wang, Boyang; Lu, Siyu] Zhengzhou Univ, Coll Chem, Green Catalysis Ctr, Zhengzhou 450000, Peoples R China; [Song, Dan] Chongqing Med Univ, Coll Biomed Engn, Key Lab Ultrasound Med & Engn, Chongqing 400010, Peoples R China; [Xiao, Huan; Xu, Wen] Yunnan Univ, Sch Phys & Astron, Kunming 650091, Peoples R China; [Xiao, Huan; Xu, Wen] Yunnan Univ, Yunnan Key Lab Quantum Informat, Kunming 650091, Peoples R China; [Xu, Wen] Micro Opt Instruments Inc, Shenzhen 518118, Peoples R China"

通信作者："Xu, W; Lu, SY (通讯作者)，Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China."

来源：APPLIED SURFACE SCIENCE

ESI学科分类：MATERIALS SCIENCE

WOS号：WOS:001004975000001

JCR分区：Q1

影响因子：6.3

年份：2023

卷号：629

期号：　

开始页：　

结束页：　

文献类型：Article

关键词：Carbon nanodots; Chemical modification; Monolayer hexagonal boron nitride; Van der Waals heterostructure; Terahertz optoelectronic properties

摘要："Carbon nanodots (CNDs) can be potentially applied in optoelectronic devices such as full-color display and LED. In this study we fabricate, for the first time, CNDs/monolayer hexagonal boron nitride (ML-hBN)/sapphire heterostructures, where i) ML-hBN is compatible with both CNDs and sapphire due to the presence of the van der Waals (vdW) forces between ML-hBN and these materials and ii) the CNDs can be chemically modified by attaching chemical bonds and/or functional groups on the surface/edges of the carbon-cores of CNDs. The basic physical and chemical properties of CNDs and the heterostructures are characterized. We further apply terahertz time-domain spectroscopy to measure the optical conductivity of CNDs/ML-hBN vdW heterostructures and to determine optically the key physical parameters of these heterostructures. The temperature dependence of these parameters is examined. We find that the agglomeration of dried CNDs on sapphire substrate can be largely suppressed by the presence of ML-hBN and the electronic and optoelectronic properties of the heterostructure can be controlled and modulated by chemical modification on CNDs. The results obtained from this study can be helpful for the fabrication, integration and modulation of CND based vdW heterostructures for practical device applications."

基金机构："National Natural Science Foundation of China [U2230122, U2067207]; Shenzhen Science and Technology Program [KQTD20190929173954826]"

基金资助正文：Acknowledgements This work was financially supported by the National Natural Science Foundation of China (Grants No. U2230122 and No. U2067207) and by Shenzhen Science and Technology Program (Grant No. KQTD20190929173954826) .