In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass

In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti multilayers on glass Pt-modified anatase polymorph of TiO2 is one of the most widely reported oxides used for sensing. In contrast, there is much fewer published work on brookite polymorph...

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Main Authors: Ho, Jeffrey Weng Chye, Chen, Zhong, Zuruzi Abu Samah, Nurmawati Muhammad Hanafiah
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2019
Subjects:
Online Access:https://hdl.handle.net/10356/107472
http://hdl.handle.net/10220/49052
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1074722020-06-01T10:13:46Z In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass Ho, Jeffrey Weng Chye Chen, Zhong Zuruzi Abu Samah Nurmawati Muhammad Hanafiah School of Materials Science & Engineering Brookite Films Engineering::Materials In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti multilayers on glass Pt-modified anatase polymorph of TiO2 is one of the most widely reported oxides used for sensing. In contrast, there is much fewer published work on brookite polymorph of TiO2 (TiO2(B)) because of its smaller stability window. Here, we demonstrate a one-step process to synthesize in-place micrometer-sized Pt-modified TiO2(B) sensing elements. Ti/Pt/Ti multilayer films sputtered on glass substrates were selectively oxidized in aqueous hydrogen peroxide to form a gel. Upon thermal annealing gel films transformed into TiO2(B). Stability of TiO2(B) is attributed to diffusion of sodium ions from glass. Pt-TiO2(B) gas sensors exhibited shorter response time and higher current increase compared to similar devices utilizing anatase TiO2 (TiO2(A)). Sensor response of up to 6 × 105 was achieved in 4000 ppm hydrogen gas. 2019-07-01T08:05:15Z 2019-12-06T22:31:59Z 2019-07-01T08:05:15Z 2019-12-06T22:31:59Z 2017 Journal Article Zuruzi Abu Samah, Nurmawati Muhammad Hanafiah, Ho, J. W. C., & Chen, Z. (2017). In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass. Sensor Letters, 15(5), 402-406. doi:10.1166/sl.2017.3769 1546-198X https://hdl.handle.net/10356/107472 http://hdl.handle.net/10220/49052 10.1166/sl.2017.3769 en Sensor Letters © 2017 American Scientific Publishers. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Brookite
Films
Engineering::Materials
spellingShingle Brookite
Films
Engineering::Materials
Ho, Jeffrey Weng Chye
Chen, Zhong
Zuruzi Abu Samah
Nurmawati Muhammad Hanafiah
In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass
description In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti multilayers on glass Pt-modified anatase polymorph of TiO2 is one of the most widely reported oxides used for sensing. In contrast, there is much fewer published work on brookite polymorph of TiO2 (TiO2(B)) because of its smaller stability window. Here, we demonstrate a one-step process to synthesize in-place micrometer-sized Pt-modified TiO2(B) sensing elements. Ti/Pt/Ti multilayer films sputtered on glass substrates were selectively oxidized in aqueous hydrogen peroxide to form a gel. Upon thermal annealing gel films transformed into TiO2(B). Stability of TiO2(B) is attributed to diffusion of sodium ions from glass. Pt-TiO2(B) gas sensors exhibited shorter response time and higher current increase compared to similar devices utilizing anatase TiO2 (TiO2(A)). Sensor response of up to 6 × 105 was achieved in 4000 ppm hydrogen gas.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Ho, Jeffrey Weng Chye
Chen, Zhong
Zuruzi Abu Samah
Nurmawati Muhammad Hanafiah
format Article
author Ho, Jeffrey Weng Chye
Chen, Zhong
Zuruzi Abu Samah
Nurmawati Muhammad Hanafiah
author_sort Ho, Jeffrey Weng Chye
title In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass
title_short In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass
title_full In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass
title_fullStr In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass
title_full_unstemmed In-place synthesis of Pt-modified brookite TiO2 micrometre-sized sensing elements via wet oxidation of Ti/Pt/Ti films on glass
title_sort in-place synthesis of pt-modified brookite tio2 micrometre-sized sensing elements via wet oxidation of ti/pt/ti films on glass
publishDate 2019
url https://hdl.handle.net/10356/107472
http://hdl.handle.net/10220/49052
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