QQ客服 官方微博 反馈留言

	Growth and photoluminescence properties of PbS nanocubes
	Cao, HQ ; Wang, GZ ; Zhang, SC ; Zhang, XR
	2010-05-06 ; 2010-05-06
关键词	OPTICAL-PROPERTIES QUANTUM-DOT NANOCRYSTALLINE SEMICONDUCTORS RAMAN-SPECTROSCOPY GALENA PBS NANOWIRES MICROCRYSTALLITES NANOPARTICLES CLUSTERS FILMS Engineering, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied
中文摘要	This paper reports the synthesis of semiconductor nanocrystals of PbS through a facile and inexpensive synthetic route between lead acetate [Pb(Ac)(2) center dot 3H(2)O] and dithioglycol (HSCH2CH2SH) without any surfactant. The products were characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Raman spectroscopy, x-ray photelectron spectroscopy (XPS) and infrared (IR) spectroscopy. The size of cube-shaped PbS nanocrystals can be controlled by changing the relative amount of Pb(Ac)(2) center dot 3H(2)O and dithioglycol. Smaller cube-shaped PbS nanocrystals were obtained at higher sulfur content in the reaction system. The nanometre-sized single crystals of PbS measure similar to 83 nm x 59 nm x 22 nm and 39 nm x 10 nm x 7 nm, for lead acetate: dithioglycol ratios of 1: 0.375 ( denoted as PbS-1) and 1: 1.5 ( denoted as PbS-2), respectively, when a mixture of NaOH solution of lead acetate and ethyl alcohol solution of dithioglycol is maintained at 220 degrees C for 4 h in a Teflon-lined autoclave. XRD patterns and HRTEM images confirm the crystalline structure of the PbS crystals. TEM helped to determine the dimension of the single crystals. Raman, XPS and IR helped to further demonstrate the purity of the as-synthesized samples. The optical absorption spectra of suspensions of the these crystals in glycol show shifts in absorption band edge for as-prepared sample PbS-1 from 246 to 271 nm and for PbS-2 from 246 to 275 nm, after four days of storage, respectively. The photoluminescence peaks from the two samples are located at 434 and 433 nm for photoexcitation radiation of 315 - 355 nm, thus exhibiting a Stokes shift compared with band edge energy. The principal contribution of this work is that the nanometre-size PbS single crystals are prepared without using a surfactant or templating agent. The formation of a five-membered ring via the chelation between the Pb2+ ion and dithioglycol is considered to be crucial in this mechanism.
语种	英语 ; 英语
出版者	IOP PUBLISHING LTD ; BRISTOL ; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/13578]
专题	清华大学
推荐引用方式 GB/T 7714	Cao, HQ,Wang, GZ,Zhang, SC,et al. Growth and photoluminescence properties of PbS nanocubes[J],2010, 2010.
APA	Cao, HQ,Wang, GZ,Zhang, SC,&Zhang, XR.(2010).Growth and photoluminescence properties of PbS nanocubes..
MLA	Cao, HQ,et al."Growth and photoluminescence properties of PbS nanocubes".(2010).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。