期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 107, 期 40, 页码 17119-17124出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1011224107
关键词
phase transition; semiconductor; dimensionality
资金
- Korean Ministry of Education, Science and Technology through the National Creative Research Initiative [R16-2002-003-01001-0]
- National Research Foundation of Korea [400-2008-0230]
- National Science Foundation (NSF)/National Institutes of Health [DMR-0225180]
- NSF [CHE-0613306, CHE-0910623]
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R31-2008-000-10013-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2002-0046427] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [910623] Funding Source: National Science Foundation
Integrated single-crystal-like small and wide-angle X-ray diffraction images of a CdSe nanosheet under pressure provide direct experimental evidence for the detailed pathway of transformation of the CdSe from a wurtzite to a rock-salt structure. Two consecutive planar atomic slips [(001) < 110 > in parallel and (102) <(1) over bar 01 > with a distortion angle of similar to 40 degrees] convert the wurtzite-based nanosheet into a saw-like rock-salt nanolayer. The transformation pressure is three times that in the bulk CdSe crystal. Theoretical calculations are in accord with the mechanism and the change in transformation pressure, and point to the critical role of the coordinated amines. Soft ligands not only increase the stability of the wurtzite structure, but also improve its elastic strength and fracture toughness. A ligand extension of 2.3 nm appears to be the critical dimension for a turning point in stress distribution, leading to the formation of wurtzite (001)/zinc-blende (111) stacking faults before rock-salt nucleation.
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