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Title: Space- and time-resolved small angle X-ray scattering to probe assembly of silver nanocrystal superlattices

Abstract

The structure of nanocrystal superlattices has been extensively studied and well documented, however, their assembly process is poorly understood. Here in this work, we demonstrate an in situ space- and time-resolved small angle X-ray scattering measurement that we use to probe the assembly of silver nanocrystal superlattices driven by electric fields. The electric field creates a nanocrystal flux to the surface, providing a systematic means to vary the nanocrystal concentration near the electrode and thereby to initiate nucleation and growth of superlattices in several minutes. Using this approach, we measure the space and time resolved concentration and polydispersity gradients during deposition and show how they affect the superlattice constant and degree of order. We find that the field induces a size-selection effect that can reduce the polydispersity near the substrate by 21% leading to better quality crystals and resulting in field strengthdependent superlattice lattice constants.

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1512593
Report Number(s):
LLNL-JRNL-737659
Journal ID: ISSN 2041-1723; 890556
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Yu, Yixuan, Yu, Dian, Sadigh, Babak, and Orme, Christine A. Space- and time-resolved small angle X-ray scattering to probe assembly of silver nanocrystal superlattices. United States: N. p., 2018. Web. doi:10.1038/s41467-018-06734-9.
Yu, Yixuan, Yu, Dian, Sadigh, Babak, & Orme, Christine A. Space- and time-resolved small angle X-ray scattering to probe assembly of silver nanocrystal superlattices. United States. doi:10.1038/s41467-018-06734-9.
Yu, Yixuan, Yu, Dian, Sadigh, Babak, and Orme, Christine A. Thu . "Space- and time-resolved small angle X-ray scattering to probe assembly of silver nanocrystal superlattices". United States. doi:10.1038/s41467-018-06734-9. https://www.osti.gov/servlets/purl/1512593.
@article{osti_1512593,
title = {Space- and time-resolved small angle X-ray scattering to probe assembly of silver nanocrystal superlattices},
author = {Yu, Yixuan and Yu, Dian and Sadigh, Babak and Orme, Christine A.},
abstractNote = {The structure of nanocrystal superlattices has been extensively studied and well documented, however, their assembly process is poorly understood. Here in this work, we demonstrate an in situ space- and time-resolved small angle X-ray scattering measurement that we use to probe the assembly of silver nanocrystal superlattices driven by electric fields. The electric field creates a nanocrystal flux to the surface, providing a systematic means to vary the nanocrystal concentration near the electrode and thereby to initiate nucleation and growth of superlattices in several minutes. Using this approach, we measure the space and time resolved concentration and polydispersity gradients during deposition and show how they affect the superlattice constant and degree of order. We find that the field induces a size-selection effect that can reduce the polydispersity near the substrate by 21% leading to better quality crystals and resulting in field strengthdependent superlattice lattice constants.},
doi = {10.1038/s41467-018-06734-9},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {10}
}

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Works referenced in this record:

Structural diversity in binary nanoparticle superlattices
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