{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T18:38:04Z","timestamp":1791225484096,"version":"4.1.0"},"reference-count":39,"publisher":"National Academy of Sciences","issue":"40","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2010,10,5]]},"abstract":"<jats:p>\n                    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) \u2329110\u232a in parallel and (102)\n                    <jats:inline-formula>\n                      <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"pnas.1011224107eq1.gif\"\/>\n                    <\/jats:inline-formula>\n                    with a distortion angle of \u223c40\u00b0] 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\u00a0nm 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.\n                  <\/jats:p>","DOI":"10.1073\/pnas.1011224107","type":"journal-article","created":{"date-parts":[[2010,9,21]],"date-time":"2010-09-21T00:37:18Z","timestamp":1285029438000},"page":"17119-17124","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":127,"title":["Reconstructing a solid-solid phase transformation pathway in CdSe nanosheets with associated soft ligands"],"prefix":"10.1073","volume":"107","author":[{"given":"Zhongwu","family":"Wang","sequence":"first","affiliation":[{"name":"Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, NY 14853;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao-Dong","family":"Wen","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roald","family":"Hoffmann","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jae Sung","family":"Son","sequence":"additional","affiliation":[{"name":"National Creative Research Initiative Center for Oxide Nanocrystalline Materials and School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruipeng","family":"Li","sequence":"additional","affiliation":[{"name":"Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, NY 14853;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chia-Chen","family":"Fang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Detlef-M.","family":"Smilgies","sequence":"additional","affiliation":[{"name":"Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, NY 14853;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taeghwan","family":"Hyeon","sequence":"additional","affiliation":[{"name":"National Creative Research Initiative Center for Oxide Nanocrystalline Materials and School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea; 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