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Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals

Gamma alumina (γ-Al(2)O(3)) is widely used as a catalyst and catalytic support due to its high specific surface area and porosity. However, synthesis of γ-Al(2)O(3) nanocrystals is often a complicated process requiring high temperatures or additional post-synthetic steps. Here, we report a single-st...

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Autores principales: Xiong, Zichang, Andaraarachchi, Himashi P., Held, Jacob T., Dorn, Rick W., Jeong, Yong-Jin, Rossini, Aaron, Kortshagen, Uwe R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10221976/
https://www.ncbi.nlm.nih.gov/pubmed/37242045
http://dx.doi.org/10.3390/nano13101627
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author Xiong, Zichang
Andaraarachchi, Himashi P.
Held, Jacob T.
Dorn, Rick W.
Jeong, Yong-Jin
Rossini, Aaron
Kortshagen, Uwe R.
author_facet Xiong, Zichang
Andaraarachchi, Himashi P.
Held, Jacob T.
Dorn, Rick W.
Jeong, Yong-Jin
Rossini, Aaron
Kortshagen, Uwe R.
author_sort Xiong, Zichang
collection PubMed
description Gamma alumina (γ-Al(2)O(3)) is widely used as a catalyst and catalytic support due to its high specific surface area and porosity. However, synthesis of γ-Al(2)O(3) nanocrystals is often a complicated process requiring high temperatures or additional post-synthetic steps. Here, we report a single-step synthesis of size-controlled and monodisperse, facetted γ-Al(2)O(3) nanocrystals in an inductively coupled nonthermal plasma reactor using trimethylaluminum and oxygen as precursors. Under optimized conditions, we observed phase-pure, cuboctahedral γ-Al(2)O(3) nanocrystals with defined surface facets. Nuclear magnetic resonance studies revealed that nanocrystal surfaces are populated with AlO(6), AlO(5) and AlO(4) units with clusters of hydroxyl groups. Nanocrystal size tuning was achieved by varying the total reactor pressure yielding particles as small as 3.5 nm, below the predicted thermodynamic stability limit for γ-Al(2)O(3).
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spelling pubmed-102219762023-05-28 Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals Xiong, Zichang Andaraarachchi, Himashi P. Held, Jacob T. Dorn, Rick W. Jeong, Yong-Jin Rossini, Aaron Kortshagen, Uwe R. Nanomaterials (Basel) Article Gamma alumina (γ-Al(2)O(3)) is widely used as a catalyst and catalytic support due to its high specific surface area and porosity. However, synthesis of γ-Al(2)O(3) nanocrystals is often a complicated process requiring high temperatures or additional post-synthetic steps. Here, we report a single-step synthesis of size-controlled and monodisperse, facetted γ-Al(2)O(3) nanocrystals in an inductively coupled nonthermal plasma reactor using trimethylaluminum and oxygen as precursors. Under optimized conditions, we observed phase-pure, cuboctahedral γ-Al(2)O(3) nanocrystals with defined surface facets. Nuclear magnetic resonance studies revealed that nanocrystal surfaces are populated with AlO(6), AlO(5) and AlO(4) units with clusters of hydroxyl groups. Nanocrystal size tuning was achieved by varying the total reactor pressure yielding particles as small as 3.5 nm, below the predicted thermodynamic stability limit for γ-Al(2)O(3). MDPI 2023-05-12 /pmc/articles/PMC10221976/ /pubmed/37242045 http://dx.doi.org/10.3390/nano13101627 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xiong, Zichang
Andaraarachchi, Himashi P.
Held, Jacob T.
Dorn, Rick W.
Jeong, Yong-Jin
Rossini, Aaron
Kortshagen, Uwe R.
Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals
title Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals
title_full Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals
title_fullStr Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals
title_full_unstemmed Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals
title_short Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al(2)O(3) Nanocrystals
title_sort inductively coupled nonthermal plasma synthesis of size-controlled γ-al(2)o(3) nanocrystals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10221976/
https://www.ncbi.nlm.nih.gov/pubmed/37242045
http://dx.doi.org/10.3390/nano13101627
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