The Core/Shell Structure of CdSe/ZnS Quantum Dots Characterized by X-Ray Absorption Fine Spectroscopy

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	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
刊名	JOURNAL OF NANOMATERIALS
	2015
页码	—
关键词	SENSITIZED SOLAR-CELLS PARTICULATE MATTER NANOCRYSTALS SIZE SHELL XAFS NANOPARTICLES COMBUSTION EFFICIENCY FACILE
ISSN号	1687-4110
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.
英文摘要	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.
语种	英语
WOS记录号	WOS:000360747200001
公开日期	2016-03-08
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/25073]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	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):—.