The Core/Shell Structure of CdSe/ZnS Quantum Dots Characterized by X-Ray Absorption Fine Spectroscopy
Wei, HJ; Zhou, J; Zhang, LJ; Wang, F; Wang, JQ; Jin, C; Jin, C (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China.
2015
发表期刊JOURNAL OF NANOMATERIALS
ISSN1687-4110
页码
文章类型期刊文献
摘要Understanding the chemical and physical properties of core/shell nanocrystal quantum dots (QDs) is key for their use in light-emission applications. In this paper, a single-step injection-free scalable synthetic method is applied to prepare high-quality core/shell QDs with emission wavelengths of 544 nm, 601 nm, and 634 nm. X-ray absorption fine structure spectra are used to determine the core/shell structure of CdSe/ZnS quantum dots. Moreover, theoretical XANES spectra calculated by FEFF. 8.20 are used to determine the structure of Se and S compounds. The QD samples displayed nearly spherical shapes with diameters of approximately 3.4 +/- 0.5nm (634 nm), 4.5 +/- 0.4nm (601 nm), and 5.5 +/- 0.5nm (544 nm). With XANES results and MS calculations, it is indicated that sphalerite ZnS capped with organic sulfur ligands should be the shell structure. Wurtzite CdSe is the main core structure with a Cd-Se bond length of 2.3 angstrom without phase shift. This means that different emission wavelengths are only due to the crystal size with single-step injection-free synthesis. Therefore, single-step injection-free synthesis could generate a nearly ideal core/shell structure of CdSe/ZnS QDs capped with an organic sulfur ligand.
关键词Sensitized Solar-cells Particulate Matter Nanocrystals Size Shell Xafs Nanoparticles Combustion Efficiency Facile
语种英语
WOS记录号WOS:000360747200001
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/25073
专题中科院上海应用物理研究所2011-2018年
通讯作者Jin, C (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China.
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Wei, HJ,Zhou, J,Zhang, LJ,et al. The Core/Shell Structure of CdSe/ZnS Quantum Dots Characterized by X-Ray Absorption Fine Spectroscopy[J]. JOURNAL OF NANOMATERIALS,2015:—.
APA Wei, HJ.,Zhou, J.,Zhang, LJ.,Wang, F.,Wang, JQ.,...&Jin, C .(2015).The Core/Shell Structure of CdSe/ZnS Quantum Dots Characterized by X-Ray Absorption Fine Spectroscopy.JOURNAL OF NANOMATERIALS,—.
MLA Wei, HJ,et al."The Core/Shell Structure of CdSe/ZnS Quantum Dots Characterized by X-Ray Absorption Fine Spectroscopy".JOURNAL OF NANOMATERIALS (2015):—.
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