Liquid-Phase Syntheses and Material Properties of Two-Dimensional Nanocrystals of Rare Earth—Selenium Compound Containing Planar Se Layers: RESe Nanosheets and REOSe Nanoplates.
Synthesis of diverse two-dimensional nano-structures 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 an...
| Published in: | Journal of the American Chemical Society Vol. 135; no. 22; pp. 8363 - 8372 |
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| Main Authors: | , , , , , |
| Format: | Article |
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American Chemical Society
6/5/2013
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=88923161&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 88923161 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 6/5/2013 vid: 135 iid: 22 pid: 997 pub: American Chemical Society artinfo: ui: 88923161 10.1021/ja4028583 ppf: 8363 ppct: 9 formats: tig: atl: Liquid-Phase Syntheses and Material Properties of Two-Dimensional Nanocrystals of Rare Earth—Selenium Compound Containing Planar Se Layers: RESe Nanosheets and REOSe Nanoplates. aug: au: Jun Gu Ze-Ojong Zhao Yi Ding Hong-Liang Chen Ya-Wen Zhang Chun-Hua Yan affil: Beijing National Laboratory for Molecular Science, State Key Laboratory of Rare Earth Materials and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A. su: Chemical synthesis Nanocrystal synthesis Selenium compounds Lanthanum Rare earth metals Rare earth metal compounds sug: subj: Chemical synthesis Nanocrystal synthesis Selenium compounds Lanthanum Rare earth metals Rare earth metal compounds ab: Synthesis of diverse two-dimensional nano-structures 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 compound nanocrystals, namely RESe nanosheets (RE = La to Nd, for EuSe, nanobars were obtained) and REOSe nanoplates (RE = Nd, Sm, Gd to Ho), under a high chemical potential of selenium obtained by activating SeO powder with oleylamine in high boiling point organic solvents. Both kinds of nanocrystals contain Se with -1 valence in planar Se layers, allowing for a great variability in thefr crystal structures. Satellite diffraction peaks were observed in the electron diffraction pattern of LaSe nanosheets, indicating the presence of Peierls distortion in the Se layers. In the REOSe nanoplates, the interaction between Se ions and [Se-Se]² dumbbells in the Se layers increases when the radii of the RE ions decrease along the lanthanide series, resulting in a narrower optical band gap (from 1.96 to 1.73 eV). The LaSe nanosheet films fabricated by drop-casting exhibited good electrical conductivity at room temperature (about 1 Ω·cm). Further, the REOSe nanoplates showed very high light extinction capacity in the visible region (extinction coefficient μ: 4.4 × 10 cm for NdOSe, and 3.1 × 10 cm for GdOSe), comparable to that (5 × 10 cm) of CuInS commonly used in solar cells. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2013 holdings: @attributes: islocal: N |
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