Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection

This study was conducted to synthesize Gallium Oxide nanomaterials from its bulk form using a low-cost and repeatable method and investigate on its potential as sensing element for Ethanol (EtOH). Horizontal Vapor Phase Growth (HVPG) Technique was utilized to synthesize monoclinic Gallium Oxide (β-G...

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Main Authors: Dela Torre, H. M. B., Santos, G. N. C.
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Published: Animo Repository 2020
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Online Access:https://animorepository.dlsu.edu.ph/faculty_research/3718
https://animorepository.dlsu.edu.ph/context/faculty_research/article/4720/type/native/viewcontent/012031.html
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spelling oai:animorepository.dlsu.edu.ph:faculty_research-47202021-10-06T03:51:57Z Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection Dela Torre, H. M. B. Santos, G. N. C. This study was conducted to synthesize Gallium Oxide nanomaterials from its bulk form using a low-cost and repeatable method and investigate on its potential as sensing element for Ethanol (EtOH). Horizontal Vapor Phase Growth (HVPG) Technique was utilized to synthesize monoclinic Gallium Oxide (β-Ga2O3) nanowires. Images obtained from the Scanning Electron Microscope showed high density nanowires specifically in the area of highest temperature gradient. SEM also showed that the grown structures using HVPG Technique were at the nanoscale with diameters ranging from 51.60 to 908.38 nm. Higher surface-to-volume ratio was also noted in the area of highest temperature gradient which was subjected to an applied magnetics field. The Gallium to Oxygen ratio was verified via EDX to be approximately 2:3 which agrees with the atomic ratio of Ga2O3. The monoclinic structure of the grown nanomaterials was investigated using Raman Spectroscopy. Raman peaks of the samples were at 199 and 486 cm-1 which was accounted to the presence of two Raman-active modes of the b-polymorph of Ga2O3. The Raman spectrum of the grown nanowires confirmed that the material is monoclinic in structure and belongs to C2/m space group. The I-V Curve of the grown nanowires were also determined using two-point probe which illustrates a non-linear curve similar to that of a semiconductor material. Furthermore, additional fundamental properties such as resistivity and specific conductance of the materials were also determined via van der Pauw Technique. Results showed that the material has high specific conductance and low resistivity. The synthesized nanomaterial was responsive to Ethanol vapor. Exposure to the said compound increased its resistance. Graphs showed that there is a significant increase in the resistance after exposure to ethanol vapor. © 2020 IOP Publishing Ltd. All rights reserved. 2020-02-07T08:00:00Z text text/html https://animorepository.dlsu.edu.ph/faculty_research/3718 info:doi/10.1088/1757-899X/739/1/012031 https://animorepository.dlsu.edu.ph/context/faculty_research/article/4720/type/native/viewcontent/012031.html Faculty Research Work Animo Repository Nanostructured materials Gallium Ethanol Physics
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
topic Nanostructured materials
Gallium
Ethanol
Physics
spellingShingle Nanostructured materials
Gallium
Ethanol
Physics
Dela Torre, H. M. B.
Santos, G. N. C.
Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection
description This study was conducted to synthesize Gallium Oxide nanomaterials from its bulk form using a low-cost and repeatable method and investigate on its potential as sensing element for Ethanol (EtOH). Horizontal Vapor Phase Growth (HVPG) Technique was utilized to synthesize monoclinic Gallium Oxide (β-Ga2O3) nanowires. Images obtained from the Scanning Electron Microscope showed high density nanowires specifically in the area of highest temperature gradient. SEM also showed that the grown structures using HVPG Technique were at the nanoscale with diameters ranging from 51.60 to 908.38 nm. Higher surface-to-volume ratio was also noted in the area of highest temperature gradient which was subjected to an applied magnetics field. The Gallium to Oxygen ratio was verified via EDX to be approximately 2:3 which agrees with the atomic ratio of Ga2O3. The monoclinic structure of the grown nanomaterials was investigated using Raman Spectroscopy. Raman peaks of the samples were at 199 and 486 cm-1 which was accounted to the presence of two Raman-active modes of the b-polymorph of Ga2O3. The Raman spectrum of the grown nanowires confirmed that the material is monoclinic in structure and belongs to C2/m space group. The I-V Curve of the grown nanowires were also determined using two-point probe which illustrates a non-linear curve similar to that of a semiconductor material. Furthermore, additional fundamental properties such as resistivity and specific conductance of the materials were also determined via van der Pauw Technique. Results showed that the material has high specific conductance and low resistivity. The synthesized nanomaterial was responsive to Ethanol vapor. Exposure to the said compound increased its resistance. Graphs showed that there is a significant increase in the resistance after exposure to ethanol vapor. © 2020 IOP Publishing Ltd. All rights reserved.
format text
author Dela Torre, H. M. B.
Santos, G. N. C.
author_facet Dela Torre, H. M. B.
Santos, G. N. C.
author_sort Dela Torre, H. M. B.
title Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection
title_short Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection
title_full Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection
title_fullStr Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection
title_full_unstemmed Synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection
title_sort synthesis and characterization of monoclinic gallium oxide nanomaterials for high-concentration ethanol vapor detection
publisher Animo Repository
publishDate 2020
url https://animorepository.dlsu.edu.ph/faculty_research/3718
https://animorepository.dlsu.edu.ph/context/faculty_research/article/4720/type/native/viewcontent/012031.html
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