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Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition

In this study, monolayer up to few-layer of Mn3O4 nanosheets grown on c-Si (111) substrates using a thermal chemical vapor deposition (TCVD) technique were investigated in detail, where the growth reaction pressure was varied from 0.12 to 0.72 mbar. The morphology of the triangular-shaped Mn3O4 nano...

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Main Authors: Hamzan, Najwa, Goh, Boon Tong, Yeoh, Keat Hoe, Chew, Khian-Hooi
Format: Article
Published: Elsevier 2022
Subjects:
QC Physics
QD Chemistry
Online Access:http://eprints.um.edu.my/42217/
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spelling my.um.eprints.422172023-10-11T02:10:45Z http://eprints.um.edu.my/42217/ Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition Hamzan, Najwa Goh, Boon Tong Yeoh, Keat Hoe Chew, Khian-Hooi QC Physics QD Chemistry In this study, monolayer up to few-layer of Mn3O4 nanosheets grown on c-Si (111) substrates using a thermal chemical vapor deposition (TCVD) technique were investigated in detail, where the growth reaction pressure was varied from 0.12 to 0.72 mbar. The morphology of the triangular-shaped Mn3O4 nanosheet greatly depends on the atomic ratio of O to Mn, which eventually determines the horizontal growth rate of the triangle's edges that forms the shape of the nanosheet. A low O/Mn ratio results in the formation of a triangle with a longer edge as compared to a high O/Mn ratio which produces a shorter edge. The 2D triangular-shaped Mn3O4 nanosheets prepared at 0.42 mbar exhibited a thickness of -1.10-2.29 nm (equivalent to the approximate thickness of monolayer-bilayer) with a maximum edge length of -850 nm, whereas ultrathin nanosheets with a thickness of -1.93-4.68 nm (equivalent to -2-3 layers) with an edge length of <250 nm were found at the highest reaction pressure of 0.72 mbar. The results imply a synthesis of 2D Mn3O4 nanosheets with controllability of thickness and edge length that vary from monolayer to ultrathin nanosheets at different O/Mn ratios. By presuming that the Mn3O4 growth along the 001] direction, we performed first-principles density-functional theory calculations to validate the structure and electronic properties of these 2D Mn3O4 nanosheets. Our calculated lattice parameters for the 2D Mn3O4 were considerably close to the experimental measurements. The band structure calculations predicted that the 2D Mn3O4 possessed metallic characteristics. This paper discusses the seed-assisted growth mechanism of these 2D Mn3O4 nanosheets. Elsevier 2022-08 Article PeerReviewed Hamzan, Najwa and Goh, Boon Tong and Yeoh, Keat Hoe and Chew, Khian-Hooi (2022) Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition. Physica E: Low-dimensional Systems and Nanostructures, 142. ISSN 1386-9477, DOI https://doi.org/10.1016/j.physe.2022.115273 <https://doi.org/10.1016/j.physe.2022.115273>. 10.1016/j.physe.2022.115273
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QC Physics
QD Chemistry
spellingShingle QC Physics
QD Chemistry
Hamzan, Najwa
Goh, Boon Tong
Yeoh, Keat Hoe
Chew, Khian-Hooi
Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition
description In this study, monolayer up to few-layer of Mn3O4 nanosheets grown on c-Si (111) substrates using a thermal chemical vapor deposition (TCVD) technique were investigated in detail, where the growth reaction pressure was varied from 0.12 to 0.72 mbar. The morphology of the triangular-shaped Mn3O4 nanosheet greatly depends on the atomic ratio of O to Mn, which eventually determines the horizontal growth rate of the triangle's edges that forms the shape of the nanosheet. A low O/Mn ratio results in the formation of a triangle with a longer edge as compared to a high O/Mn ratio which produces a shorter edge. The 2D triangular-shaped Mn3O4 nanosheets prepared at 0.42 mbar exhibited a thickness of -1.10-2.29 nm (equivalent to the approximate thickness of monolayer-bilayer) with a maximum edge length of -850 nm, whereas ultrathin nanosheets with a thickness of -1.93-4.68 nm (equivalent to -2-3 layers) with an edge length of <250 nm were found at the highest reaction pressure of 0.72 mbar. The results imply a synthesis of 2D Mn3O4 nanosheets with controllability of thickness and edge length that vary from monolayer to ultrathin nanosheets at different O/Mn ratios. By presuming that the Mn3O4 growth along the 001] direction, we performed first-principles density-functional theory calculations to validate the structure and electronic properties of these 2D Mn3O4 nanosheets. Our calculated lattice parameters for the 2D Mn3O4 were considerably close to the experimental measurements. The band structure calculations predicted that the 2D Mn3O4 possessed metallic characteristics. This paper discusses the seed-assisted growth mechanism of these 2D Mn3O4 nanosheets.
format Article
author Hamzan, Najwa
Goh, Boon Tong
Yeoh, Keat Hoe
Chew, Khian-Hooi
author_facet Hamzan, Najwa
Goh, Boon Tong
Yeoh, Keat Hoe
Chew, Khian-Hooi
author_sort Hamzan, Najwa
title Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition
title_short Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition
title_full Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition
title_fullStr Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition
title_full_unstemmed Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition
title_sort size-controllable synthesis of 2d mn3o4 triangular-shaped nanosheets by thermal chemical vapor deposition
publisher Elsevier
publishDate 2022
url http://eprints.um.edu.my/42217/
_version_ 1781704611566977024
score 13.211869

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