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Title: Concerted growth and ordering of cobalt nanorod arrays as revealed by tandem in situ SAXS-XAS studies

Abstract

The molecular and ensemble dynamics for the growth of hierarchical supercrystals of cobalt nanorods have been studied by in situ tandem X-ray Absorption Spectroscopy – Small Angle X-ray Scattering (XAS - SAXS). The super-crystals were obtained by reducing a Co(II) precursor under H 2 in the presence of a long chain amine and a long chain carboxylic acid. Complementary time-dependent ex situ TEM studies were also performed. The experimental data provide critical insights into the nanorod growth mechanism, and unequivocal evidence for a concerted growth-organization process. Nanorod formation involves cobalt nucleation, a fast atom by atom anisotropic growth and a slower oriented attach-ment process that continues well after cobalt reduction is complete. As a result, smectic-like ordering of the nanorods appears very early in the process, as soon as nanoparticle elongation appears, and nanorod growth takes place inside organized super-lattices, which can be regarded as mesocrystals.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [1];  [4];  [2];  [1]
  1. Univ. de Toulouse, Toulouse (France)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. de Toulouse, Toulouse (France); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1339959
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 138; Journal Issue: 27; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Cormary, Benoit, Li, Tao, Liakakos, Nikos, Peres, Laurent, Fazzini, Pier -Francesco, Blon, Thomas, Respaud, Marc, Kropf, A. Jeremy, Chaudret, Bruno, Miller, Jeffrey T., Mader, Elizabeth A., and Soulantica, Katerina. Concerted growth and ordering of cobalt nanorod arrays as revealed by tandem in situ SAXS-XAS studies. United States: N. p., 2016. Web. doi:10.1021/jacs.6b01929.
Cormary, Benoit, Li, Tao, Liakakos, Nikos, Peres, Laurent, Fazzini, Pier -Francesco, Blon, Thomas, Respaud, Marc, Kropf, A. Jeremy, Chaudret, Bruno, Miller, Jeffrey T., Mader, Elizabeth A., & Soulantica, Katerina. Concerted growth and ordering of cobalt nanorod arrays as revealed by tandem in situ SAXS-XAS studies. United States. doi:10.1021/jacs.6b01929.
Cormary, Benoit, Li, Tao, Liakakos, Nikos, Peres, Laurent, Fazzini, Pier -Francesco, Blon, Thomas, Respaud, Marc, Kropf, A. Jeremy, Chaudret, Bruno, Miller, Jeffrey T., Mader, Elizabeth A., and Soulantica, Katerina. 2016. "Concerted growth and ordering of cobalt nanorod arrays as revealed by tandem in situ SAXS-XAS studies". United States. doi:10.1021/jacs.6b01929. https://www.osti.gov/servlets/purl/1339959.
@article{osti_1339959,
title = {Concerted growth and ordering of cobalt nanorod arrays as revealed by tandem in situ SAXS-XAS studies},
author = {Cormary, Benoit and Li, Tao and Liakakos, Nikos and Peres, Laurent and Fazzini, Pier -Francesco and Blon, Thomas and Respaud, Marc and Kropf, A. Jeremy and Chaudret, Bruno and Miller, Jeffrey T. and Mader, Elizabeth A. and Soulantica, Katerina},
abstractNote = {The molecular and ensemble dynamics for the growth of hierarchical supercrystals of cobalt nanorods have been studied by in situ tandem X-ray Absorption Spectroscopy – Small Angle X-ray Scattering (XAS - SAXS). The super-crystals were obtained by reducing a Co(II) precursor under H2 in the presence of a long chain amine and a long chain carboxylic acid. Complementary time-dependent ex situ TEM studies were also performed. The experimental data provide critical insights into the nanorod growth mechanism, and unequivocal evidence for a concerted growth-organization process. Nanorod formation involves cobalt nucleation, a fast atom by atom anisotropic growth and a slower oriented attach-ment process that continues well after cobalt reduction is complete. As a result, smectic-like ordering of the nanorods appears very early in the process, as soon as nanoparticle elongation appears, and nanorod growth takes place inside organized super-lattices, which can be regarded as mesocrystals.},
doi = {10.1021/jacs.6b01929},
journal = {Journal of the American Chemical Society},
number = 27,
volume = 138,
place = {United States},
year = 2016,
month = 6
}

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