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Title: Small, solubilized platinum nanocrystals consist of an ordered core surrounded by mobile surface atoms

Journal Article · · Communications Chemistry
ORCiD logo [1];  [1];  [2]; ORCiD logo [1];  [1]; ORCiD logo [3]; ORCiD logo [3];  [4];  [3]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [1]
  1. National Cancer Institute, Bethesda, MD (United States)
  2. Monash Univ., Melbourne, VIC (Australia)
  3. Institute of Basic Science (IBS), Daejeon (Korea, Republic of); Seoul National Univ. (Korea, Republic of)
  4. Soongsil Univ., Seoul (Korea, Republic of)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy

In situ structures of Platinum (Pt) nanoparticles (NPs) can be determined with graphene liquid cell transmission electron microscopy. Atomic-scale three-dimensional structural information about their physiochemical properties in solution is critical for understanding their chemical function. We here analyze eight atomic-resolution maps of small (<3 nm) colloidal Pt NPs. Their structures are composed of an ordered crystalline core surrounded by surface atoms with comparatively high mobility. 3D reconstructions calculated from cumulative doses of 8500 and 17,000 electrons/pixel, respectively, are characterized in terms of loss of atomic densities and atomic displacements. Less than 5% of the total number of atoms are lost due to dissolution or knock-on damage in five of the structures analyzed, whereas 10–16% are lost in the remaining three. Less than 5% of the atomic positions are displaced due to the increased electron irradiation in all structures. The surface dynamics will play a critical role in the diverse catalytic function of Pt NPs and must be considered in efforts to model Pt NP function computationally.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2337827
Journal Information:
Communications Chemistry, Journal Name: Communications Chemistry Journal Issue: 1 Vol. 7; ISSN 2399-3669
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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