Temperature dependence of photoluminescence from self-organized Ge quantum dots with large size and low density

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	Temperature dependence of photoluminescence from self-organized Ge quantum dots with large size and low density
	Li, H ; He, T ; Dai, LG ; Wang, XL ; Wang, WX ; Chen, H
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2011
卷号	54 期号:2 页码:245
关键词	GROWTH WELL
ISSN号	1674-7348
通讯作者	Li, H (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	Two-dimensional ordered patterns of n-tetradecane (n-C(14)H(30)) and n-hexadecane (n-C(16)H(34)) molecules at liquid/graphite interface have been directly imaged using scanning tunneling microscope (STM) under ambient conditions. STM images reveal that the two different kinds of molecules self-organize into ordered lamellar structures in which alkane chains of the molecules extend along one of three equivalent lattice axes of highly oriented pyrolytic graphite (HOPG) basal plane. For n-C14H30 molecules, the molecular axes are observed to tilt by 60 degrees with respect to inter-lamellar trough lines and the carbon backbones of the alkane chains are perpendicular to the HOPG basal plane in an all-trans conformation. However, for n-C(16)H(34) molecules, the molecular axes are perpendicular to lamellar borders (90 degrees) and the planes of the all-trans carbon skeletons are parallel to the graphite basal plane. The results clearly indicate that outmost hydrogen atoms of the alkane chains dominate atom-scaled features of the STM images. That is, in the case of long-chain alkane molecules, topographic effects dominantly determine STM image contrast of the methylene regions of the alkane chains that are adsorbed on HOPG. (C) 2010 Elsevier B. V. All rights reserved.
收录类别	SCI
资助信息	Ministry of Science and Technology of China; National Natural Science Foundation of China [10471026, 10874212]; National High Technology Research and Development Program of China [2006AA03A107]
语种	英语
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/44764]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Li, H,He, T,Dai, LG,et al. Temperature dependence of photoluminescence from self-organized Ge quantum dots with large size and low density[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2011,54(2):245.
APA	Li, H,He, T,Dai, LG,Wang, XL,Wang, WX,&Chen, H.(2011).Temperature dependence of photoluminescence from self-organized Ge quantum dots with large size and low density.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,54(2),245.
MLA	Li, H,et al."Temperature dependence of photoluminescence from self-organized Ge quantum dots with large size and low density".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 54.2(2011):245.