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나노물질및화학반응연구단
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Atomic Scale Mechanisms Underlying Thermal Reshaping of Anisotropic Gold Nanocrystals Revealed by in Situ Electron Microscopy

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dc.contributor.authorHoduk Cho-
dc.contributor.authorJae Won Shin-
dc.contributor.authorRyong Ryoo-
dc.date.accessioned2021-01-06T05:30:43Z-
dc.date.accessioned2021-01-06T05:30:43Z-
dc.date.available2021-01-06T05:30:43Z-
dc.date.available2021-01-06T05:30:43Z-
dc.date.created2020-06-29-
dc.date.issued2020-06-
dc.identifier.issn1932-7447-
dc.identifier.urihttps://pr.ibs.re.kr/handle/8788114/8996-
dc.description.abstractUnderstanding the shape transformation processes of anisotropic nanocrystals is an essential step toward fully exploiting their remarkable shape-dependent properties. Here, we employ environmental transmission electron microscopy with controlled heating to directly visualize the thermal reshaping dynamics of gold nanorods and triangular nanoplates at the atomic level. Upon heating above 180 °C in 1 mbar of oxygen, thiol ligand molecules that are stabilizing these metastable nanostructures desorb to allow the subsequent migration of surface atoms. As a consequence, nanorods undergo rounding into ellipsoids, with indiscriminate surface migration of vertex atoms to the sides being mediated by the development of multiple high-index facets. By contrast, triangular nanoplates exhibit truncation of their vertices, which proceeds via selective layer-by-layer migration of vertex atoms to the triangular faces until a hexagonal shape is attained. Although the thermodynamic driving force is the minimization of the fraction of undercoordinated surface atoms, with the final structure being an isotropic sphere, both surface curvature and surface faceting play a role in determining the pathway to be taken. The peculiar morphology of triangular nanoplates allowed the transition to hexagonal nanoplates to occur with the structure remaining enclosed by stable {111} facets on all faces. Our results demonstrate how in situ electron microscopy can afford fundamental insights into the reshaping mechanisms of anisotropic nanocrystals-
dc.description.uri1-
dc.language영어-
dc.publisherAmerican Chemical Society-
dc.titleAtomic Scale Mechanisms Underlying Thermal Reshaping of Anisotropic Gold Nanocrystals Revealed by in Situ Electron Microscopy-
dc.typeArticle-
dc.type.rimsART-
dc.identifier.wosid000541745800072-
dc.identifier.scopusid2-s2.0-85085707010-
dc.identifier.rimsid72318-
dc.contributor.affiliatedAuthorHoduk Cho-
dc.contributor.affiliatedAuthorJae Won Shin-
dc.contributor.affiliatedAuthorRyong Ryoo-
dc.identifier.doi10.1021/acs.jpcc.0c04281-
dc.identifier.bibliographicCitationJournal of Physical Chemistry C, v.124, no.23, pp.12855 - 12863-
dc.citation.titleJournal of Physical Chemistry C-
dc.citation.volume124-
dc.citation.number23-
dc.citation.startPage12855-
dc.citation.endPage12863-
dc.description.journalClass1-
dc.description.isOpenAccessN-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.subject.keywordPlusOPTICAL-PROPERTIES-
dc.subject.keywordPlusRADIATION-DAMAGE-
dc.subject.keywordPlusCOLLOIDAL GOLD-
dc.subject.keywordPlusSHAPE CONTROL-
dc.subject.keywordPlusNANORODS-
dc.subject.keywordPlusNANOPARTICLES-
dc.subject.keywordPlusSURFACE-
dc.subject.keywordPlusSTABILITY-
dc.subject.keywordPlusFEMTOSECOND-
dc.subject.keywordPlusGROWTH-
dc.subject.keywordAuthorOPTICAL-PROPERTIES-
dc.subject.keywordAuthorRADIATION-DAMAGE-
dc.subject.keywordAuthorCOLLOIDAL GOLD-
dc.subject.keywordAuthorSHAPE CONTROL-
dc.subject.keywordAuthorNANORODS-
dc.subject.keywordAuthorNANOPARTICLES-
dc.subject.keywordAuthorSURFACE-
dc.subject.keywordAuthorSTABILITY-
dc.subject.keywordAuthorFEMTOSECOND-
dc.subject.keywordAuthorGROWTH-
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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