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Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices

[Image: see text] Dodecanethiol-capped gold (Au) nanocrystal superlattices can undergo a surprisingly diverse series of ordered structure transitions when heated (Goodfellow, B. W.; Rasch, M. R.; Hessel, C. M.; Patel, R. N.; Smilgies, D.-M.; Korgel, B. A. Nano Lett.2013, 13, 5710–5714). These are th...

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Autores principales: Yu, Yixuan, Goodfellow, Brian W., Rasch, Michael R., Bosoy, Christian, Smilgies, Detlef-M., Korgel, Brian A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2015
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4479963/
https://www.ncbi.nlm.nih.gov/pubmed/26013597
http://dx.doi.org/10.1021/acs.langmuir.5b01498
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author Yu, Yixuan
Goodfellow, Brian W.
Rasch, Michael R.
Bosoy, Christian
Smilgies, Detlef-M.
Korgel, Brian A.
author_facet Yu, Yixuan
Goodfellow, Brian W.
Rasch, Michael R.
Bosoy, Christian
Smilgies, Detlef-M.
Korgel, Brian A.
author_sort Yu, Yixuan
collection PubMed
description [Image: see text] Dodecanethiol-capped gold (Au) nanocrystal superlattices can undergo a surprisingly diverse series of ordered structure transitions when heated (Goodfellow, B. W.; Rasch, M. R.; Hessel, C. M.; Patel, R. N.; Smilgies, D.-M.; Korgel, B. A. Nano Lett.2013, 13, 5710–5714). These are the result of highly uniform changes in nanocrystal size, which subsequently force a spontaneous rearrangement of superlattice structure. Here, we show that halide-containing surfactants play an essential role in these transitions. In the absence of any halide-containing surfactant, superlattices of dodecanethiol-capped (1.9-nm-diameter) Au nanocrystals do not change size until reaching about 190–205 °C, at which point the gold cores coalesce. In the presence of halide-containing surfactant, such as tetraoctylphosphonium bromide (TOPB) or tetraoctylammounium bromide (TOAB), the nanocrystals ripen at much lower temperature and superlattices undergo various ordered structure transitions upon heating. Chloride- and iodide-containing surfactants induce similar behavior, destabilizing the Au–thiol bond and reducing the thermal stability of the nanocrystals.
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spelling pubmed-44799632015-07-01 Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices Yu, Yixuan Goodfellow, Brian W. Rasch, Michael R. Bosoy, Christian Smilgies, Detlef-M. Korgel, Brian A. Langmuir [Image: see text] Dodecanethiol-capped gold (Au) nanocrystal superlattices can undergo a surprisingly diverse series of ordered structure transitions when heated (Goodfellow, B. W.; Rasch, M. R.; Hessel, C. M.; Patel, R. N.; Smilgies, D.-M.; Korgel, B. A. Nano Lett.2013, 13, 5710–5714). These are the result of highly uniform changes in nanocrystal size, which subsequently force a spontaneous rearrangement of superlattice structure. Here, we show that halide-containing surfactants play an essential role in these transitions. In the absence of any halide-containing surfactant, superlattices of dodecanethiol-capped (1.9-nm-diameter) Au nanocrystals do not change size until reaching about 190–205 °C, at which point the gold cores coalesce. In the presence of halide-containing surfactant, such as tetraoctylphosphonium bromide (TOPB) or tetraoctylammounium bromide (TOAB), the nanocrystals ripen at much lower temperature and superlattices undergo various ordered structure transitions upon heating. Chloride- and iodide-containing surfactants induce similar behavior, destabilizing the Au–thiol bond and reducing the thermal stability of the nanocrystals. American Chemical Society 2015-05-27 2015-06-23 /pmc/articles/PMC4479963/ /pubmed/26013597 http://dx.doi.org/10.1021/acs.langmuir.5b01498 Text en Copyright © 2015 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Yu, Yixuan
Goodfellow, Brian W.
Rasch, Michael R.
Bosoy, Christian
Smilgies, Detlef-M.
Korgel, Brian A.
Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices
title Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices
title_full Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices
title_fullStr Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices
title_full_unstemmed Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices
title_short Role of Halides in the Ordered Structure Transitions of Heated Gold Nanocrystal Superlattices
title_sort role of halides in the ordered structure transitions of heated gold nanocrystal superlattices
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4479963/
https://www.ncbi.nlm.nih.gov/pubmed/26013597
http://dx.doi.org/10.1021/acs.langmuir.5b01498
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