Designed Synthesis, Structure, and Properties of a Family of Ferecrystalline Compounds [(PbSe)](MoSe).
The targeted synthesis of multiple compounds with specific controlled nanostructures and identical composition is a grand challenge in materials chemistry. We report the synthesis of the new metastable compounds [(PbSe)](MoSe) using precursors each designed to self-assemble into a specific compound....
| Publicado en: | Journal of the American Chemical Society Vol. 135; no. 30; pp. 11055 - 11063 |
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| Autores principales: | , , , , , , , |
| Formato: | Artículo |
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American Chemical Society
7/31/2013
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=90529992&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 90529992 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: 7/31/2013 vid: 135 iid: 30 pid: 997 pub: American Chemical Society artinfo: ui: 90529992 10.1021/ja402819q ppf: 11055 ppct: 8 formats: tig: atl: Designed Synthesis, Structure, and Properties of a Family of Ferecrystalline Compounds [(PbSe)](MoSe). aug: au: Heideman, Colby L. Tepfer, Sara Qiyin Lin Rostek, Raimar Zschack, Paul Anderson, Michael D. Anderson, Ian M. Johnson, David C. affil: Department of Chemistry, Eastern Oregon University, La Grande, Oregon 97850, United States Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States California Institute for Telecommunications and Information Technology, University of California, Irvine, California 92697, United States Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States Surface and Microanalysis Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States su: Nanostructured materials synthesis Crystal structure Chemical precursors Molecular self-assembly Lead selenide crystals Molybdenum selenides sug: subj: Nanostructured materials synthesis Crystal structure Chemical precursors Molecular self-assembly Lead selenide crystals Molybdenum selenides ab: The targeted synthesis of multiple compounds with specific controlled nanostructures and identical composition is a grand challenge in materials chemistry. We report the synthesis of the new metastable compounds [(PbSe)](MoSe) using precursors each designed to self-assemble into a specific compound. To form a compound with specific values for m and n, the number of atoms within each deposited elemental layer was carefully controlled to provide the correct absolute number of atoms to form complete layers of each component structural unit. On low-temperature annealing, these structures self-assemble with a specific crystallographic orientation between the component structural units with atomically abrupt interfaces. There is rotational disorder between the component structural units and between MoSe2 basal plane units within the MoSe2 layers themselves. The lead selenide constituent has a distorted rock salt structure exactly m bilayers thick leading to peaks in the off-axis diffraction pattern as a result of the finite size of and rotational disorder between the crystallites. The in-plane lattice parameters of the PbSe and MoSe2 components are independent of the value of m and n, suggesting little or no strain caused by the interface between them. These compounds are small band gap semiconductors with carrier properties dominated by defects and exhibit extremely low thermal conductivity as a result of the rotational disorder. The thermal conductivity can be tuned by varying the ratio of the number of ordered PbSe rock salt layers relative to the number of rotationally disordered MoSe2 layers. This approach, based on controlling the local composition of the precursor and low temperature to limit diffusion rates, provides a general route to the synthesis of new compounds containing alternating layers of constituents with designed nanoarchitecture. 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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