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Los Alamos National LaboratoryCenter for Integrated Nanotechnologies
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2020 Highlights

A selection of CINT science highlights from staff and user research.

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  • Hongyou Fan
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High-Pressure Properties of Nanocrystals Sensitive to Particle Shape

Scientific Achievement

Using wide-angle X-ray scattering (WAXS) and transmission electron microscopy (TEM), scientists have shown that the shape of semiconductor nanocrystals plays an important role in determining their high-pressure properties, specifically for phase transitions.

Significance and Impact

This work provides important insights into the phase–structure–property relationship of nanoparticles, which could guide the design and development of novel functional nanomaterials.

Research Details

  • Schematic of Synchrotron X-ray and TEM images of nanoparticles.The images shows TEM images of the nanoparticles investigated: CdS nanospheres (top), short CdS nanorods (middle), long CdSe/CdS nanorods.
  • Under high pressure, cadmium sulfide (CdS) nanocrystals transform from wurtzite (WZ) to rocksalt (RS) phase. WZ-to-RS phase changes were found to be irreversible in nanospheres but partially reversible in nanorods.
  • In-situ WAXS shows shape-dependent phase transition pressure: CdS nanospheres phase transition at P = 6 GPa while long nanorods phase transition at P = 8 GPa.
  • TEM images of spherical particles showed sintering-induced morphology change after high-pressure compression.

Publication: Meng L, Lane JM, Baca L, Tafoya J, Ao T, Stoltzfus B, Knudson M, Morgan D, Austin K, Park C, Chow P. et al. "Shape Dependence of Pressure-Induced Phase Transition in CdS Semiconductor Nanocrystals." Journal of the American Chemical Society. 2020 Mar 23;142(14):6505-10. [DOI: 10.1021/jacs.0c01906]

Funding: This was supported by the National Science Foundation (DMR-1453083 and CHE-1904659) and an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under grant number P20GM103451.This work was supported by the Sandia’s Laboratory Directed Research & Development (LDRD) program. Portions of this work were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA’s Office of Experimental Sciences. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Research was carried out, in part, at the Center of Integrated Nanotechnology (CINT), a US Department of Energy, Office of Basic Energy Sciences user facility.