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Controlling Nanoparticle Orientations in the Self-Assembly of Patchy Quantum Dot-Gold Heterostructural Nanocrystals

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.9b01033· OSTI ID:1524555
 [1];  [2];  [3];  [2];  [1];  [4];  [1];  [5];  [6];  [6];  [6];  [6];  [7];  [8];  [2];  [1]
  1. Brown Univ., Providence, RI (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States)
  3. Univ. of Florida, Gainesville, FL (United States)
  4. Max Planck Inst. for the Structure and Dynamics of Matter, Hamburg (Germany); Heinrich Petter Institute-Leibniz Inst. for Experimental Virology, Hamburg (Germany)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Univ. of Connecticut, Storrs, CT (United States)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  8. Cornell Univ., Ithaca, NY (United States)

Self-assembly of nanocrystals is a promising route for creating macroscale materials that derive function from the properties of their nanoscale building blocks. While much progress has been made assembling nanocrystals into different superlattices, controlling the relative orientations of nanocrystals in those lattices remains a challenge. Here, we combine experiments with computer simulations to study the self-assembly of patchy heterostructural nanocrystals (HNCs), consisting of near-spherical quantum dots decorated with regular arrangements of small gold satellites, into close-packed superlattices with pronounced orientational alignment of HNCs. Our simulations indicate that the orientational alignment is caused by van der Waals interactions between gold patches and is sensitive to the interparticle distance in the superlattice. We demonstrate experimentally that the degree and type of orientational alignment can be controlled by changing ligand populations on HNCs. This study provides guidance for the design and fabrication of nanocrystal superlattices with enhanced structural control.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1524555
Alternate ID(s):
OSTI ID: 1532538
Report Number(s):
BNL--211720-2019-JAAM
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 14 Vol. 141; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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