Spherical hexagonal tellurium nanocrystals: fabrication and size-dependent structural phase transition at high pressure

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	Spherical hexagonal tellurium nanocrystals: fabrication and size-dependent structural phase transition at high pressure
	Z. T. Deng; Z. X. Bao; L. Cao; D. Chen; F. Q. Tang; F. F. Wang; C. X. Liu; B. S. Zou; A. J. Muscat
	2008
发表期刊	Nanotechnology
ISSN	0957-4484
卷号	19 期号:4
摘要	Single-crystalline spherical nearly monodisperse tellurium (Te) nanocrystals (NCs) with average diameters of 20 and 90 nm, respectively, have been fabricated for the first time by a facile solution sonochemistry process. The structural characterizations show that the as-synthesized Te NCs have pure hexagonal structure, as revealed by x-ray diffraction (XRD), selected-area electron diffraction (SAED), energy-dispersive x-ray (EDX) spectroscopy, and high-resolution transmission electron microscopy (HRTEM) methods. The size-dependent structural phase transition of Te NCs up to the high pressure of 20 GPa has been investigated in a diamond anvil cell using resistance measurement at room temperature, and compared with the behavior of bulk Te under identical conditions. The experimental results indicate that 20 nm Te NCs, 90 nm NCs, and bulk Te all undergo two phase transitions up to 20 GPa, their respective transition pressures being about 7.2 and 10.3 GPa, 5.9 and 8.8 GPa, and 4.0 and 6.8 GPa. This indicates that the phase transition pressures are higher for the smaller NCs. In this paper we discuss the size-dependent structural phase transitions, the sluggishness of the phase transition process, and the fluctuating properties of the phase transition products at high pressure. The present work might open an avenue to real-time detection of the dynamics of the phase transition in bulk and nanoscale materials at high pressure, and also could serve as a guide to tailoring the microscopic properties of materials.
部门归属	[deng, zhengtao; chen, dong; tang, fangqiong] chinese acad sci, tech inst phys & chem, lab controllable preparat & applicat nanomat, beijing 100080, peoples r china. [deng, zhengtao] grad univ chinese acad sci, beijing 100080, peoples r china. [deng, zhengtao] univ arizona, dept chem & environm engn, tucson, az 85721 usa. [bao, zhongxing; cao, li; wang, feifei; zou, bingsuo] chinese acad sci, inst phys, beijing 100080, peoples r china. [bao, zhongxing] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;tang, fq (reprint author), chinese acad sci, tech inst phys & chem, lab controllable preparat & applicat nanomat, beijing 100080, peoples r china;tangfq@mail.ipc.ac.cn
关键词	Cdse Nanocrystals Semiconductor Nanocrystals Electrical-properties Growth-mechanism Nanorods Transformations Nanowires Nanotubes Nanostructures Superlattices
URL	查看原文
WOS记录号	WOS:000252967000030
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32714
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. T. Deng,Z. X. Bao,L. Cao,et al. Spherical hexagonal tellurium nanocrystals: fabrication and size-dependent structural phase transition at high pressure[J]. Nanotechnology,2008,19(4).
APA	Z. T. Deng.,Z. X. Bao.,L. Cao.,D. Chen.,F. Q. Tang.,...&A. J. Muscat.(2008).Spherical hexagonal tellurium nanocrystals: fabrication and size-dependent structural phase transition at high pressure.Nanotechnology,19(4).
MLA	Z. T. Deng,et al."Spherical hexagonal tellurium nanocrystals: fabrication and size-dependent structural phase transition at high pressure".Nanotechnology 19.4(2008).