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Son, Jae Sung
Nanomaterials Science and Engineering Lab (NSE)
Research Interests
  • Nanoparticle, 3D printing, Thermoelectrics, Electronics

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Reconstructing a solid-solid phase transformation pathway in CdSe nanosheets with associated soft ligands

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Title
Reconstructing a solid-solid phase transformation pathway in CdSe nanosheets with associated soft ligands
Author
Wang, ZhongwuWen, Xiao-DongHoffmann, RoaldSon, Jae SungLi, RuipengFang, Chia-ChenSmilgies, Detlef-M.Hyeon, Taeghwan
Keywords
Dimensionality; Phase transition; Semiconductor
Issue Date
2010-10
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.107, no.40, pp.17119 - 17124
Abstract
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) 〈101〉 with a distortion angle of ∼40°] 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.
URI
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DOI
10.1073/pnas.1011224107
ISSN
0027-8424
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MSE_Journal Papers
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