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Title: Structural evolution and mechanical behaviour of Pt nanoparticle superlattices at high pressure

High pressure is an effective means for tuning the interparticle distances of nanoparticle (NP) superlattice and thus for modifying their physical properties and functionalities. In this work, we determined the evolutio of inter-NP distances of a Pt NP superlattice with increasing pressure using an in situ synchrotro small-angle X-ray scattering (SAXS) technique in a diamond-anvil cell (DAC). Transmission electro microscopy (TEM) was used to characterize the microstructures of pre- and post-compression samples Our results demonstrate that the evolution of Pt NP assemblies with increasing pressure consists of fou stages: (1) ligand elastic response, (2) uniform compression, (3) ligand detachment from NP surfaces, an (4) deviatoric compression of ligands between neighboring NPs. Lastly, by controlling the magnitudes of applie pressure and deviatoric stress, one can sinter NPs into novel architectures such as nanowires an nanoceramics.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6] ;  [1] ;  [2]
  1. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and Astronomy
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Earth and Environmental Sciences Division
  3. State Univ. of New York (SUNY), Binghamton, NY (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Coal Chemistry
  5. Univ. of New Mexico, Albuquerque, NM (United States). TEM Lab.
  6. Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchroton Source
Publication Date:
Grant/Contract Number:
Accepted Manuscript
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Additional Journal Information:
Journal Volume: 8; Journal Issue: 9; Journal ID: ISSN 2040-3364
Royal Society of Chemistry
Research Org:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; nanoparticle superlattice; high pressure; SAXS; TEM
OSTI Identifier: