Liquid-Phase Syntheses and Material Properties of Two-Dimensional   Nanocrystals of Rare Earth-Selenium Compound Containing Planar Se   Layers: RESe2 Nanosheets and RE4O4Se3 Nanoplates

doi:10.1021/ja4028583

CORC > 北京大学 > 化学与分子工程学院

	Liquid-Phase Syntheses and Material Properties of Two-Dimensional Nanocrystals of Rare Earth-Selenium Compound Containing Planar Se Layers: RESe2 Nanosheets and RE4O4Se3 Nanoplates
	Gu, Jun ; Zhao, Ze-Qiong ; Ding, Yi ; Chen, Hong-Liang ; Zhang, Ya-Wen ; Yan, Chun-Hua
刊名	journal of the american chemical society
	2013
关键词	CHARGE-DENSITY-WAVE FLUORIDE NANOCRYSTALS OPTICAL-PROPERTIES CRYSTAL-STRUCTURES QUANTUM DOTS FERROMAGNETISM NANORIBBONS ABSORPTION TRANSITION THICKNESS
DOI	10.1021/ja4028583
英文摘要	Synthesis of diverse two-dimensional nanostructures with unique material properties is of current interest and multidisciplinary importance but remains a challenge for trivalent rare earth (RE)-selenium (Se) compounds because of the weak affinity between hard rare earth cations and soft selenium anions. In this article, for the first time, we report a mild solution approach toward a series of two-dimensional trivalent RE-selenium compounds nanocrystals, namely RESe2 nanosheets (RE = La to Nd, for EuSe2, nanobars were obtained) and RE4O4Se3 nanoplates (RE = Nd, Sm, Gd to Ho), under a high chemical potential of selenium obtained by activating SeO2 powder with oleylamine in high boiling point organic solvents. Both kinds of nanocrystals contain Se with -1 valence in planer Se layers, allowing for a great variability in their crystal structures. Satellite diffraction peaks were observed in the electron diffraction pattern of LaSe2 nanosheets, indicating the presence of Peierls distortion in the Se layers. In the RE4O4Se3 nanoplates, the interaction between Se2- ions and [Se-Se](2-) dumbbells in the Se layers increases when the radii of the RE3+ ions decrease along the lanthanide series, resulting in a narrower optical band gap (from 1.96 to 1.73 eV). The LaSe2 nanosheet films fabricated by drop-casting exhibited good electrical conductivity at room temperature (about 1 Omega.cm(-1)). Further, the RE4O4Se3 nanoplates showed very high light extinction capacity in the visible region (extinction coefficient mu(1); 4.4 x 10(5) cm(-1) for Nd4O4Se3, and 3.1 x 10(5) cm(-1) for Gd4O4Se3), comparable to that (5 x 10(5) cm(-1)) of CuInS2 commonly used in solar cells.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000320153100048&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Chemistry, Multidisciplinary; SCI(E); EI; 14; ARTICLE; 22; 8363-8371; 135
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/150748]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Gu, Jun,Zhao, Ze-Qiong,Ding, Yi,et al. Liquid-Phase Syntheses and Material Properties of Two-Dimensional Nanocrystals of Rare Earth-Selenium Compound Containing Planar Se Layers: RESe2 Nanosheets and RE4O4Se3 Nanoplates[J]. journal of the american chemical society,2013.
APA	Gu, Jun,Zhao, Ze-Qiong,Ding, Yi,Chen, Hong-Liang,Zhang, Ya-Wen,&Yan, Chun-Hua.(2013).Liquid-Phase Syntheses and Material Properties of Two-Dimensional Nanocrystals of Rare Earth-Selenium Compound Containing Planar Se Layers: RESe2 Nanosheets and RE4O4Se3 Nanoplates.journal of the american chemical society.
MLA	Gu, Jun,et al."Liquid-Phase Syntheses and Material Properties of Two-Dimensional Nanocrystals of Rare Earth-Selenium Compound Containing Planar Se Layers: RESe2 Nanosheets and RE4O4Se3 Nanoplates".journal of the american chemical society (2013).