Hydrogen incorporation in gasochromic coloration of sol-gel WO3 thin films

Chih Chieh Chan, Chia Wen Hsu, Chung Chieh Chang, Chao Sheng Hsu

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

In the present work, nanostructured WO3 films were prepared by the sol-gel spin coating method. The as-prepared films were annealed at different temperatures and their structures were characterized by field-emission scanning electron microscopy and X-ray diffraction. A layer of platinum (Pt) was then sputtered onto the surface of WO3 films. The gasochromic properties of the prepared Pt/WO3 thin films were examined by use of optical transmittance under alternate exposures to various H2-N 2 gas mixture and air. The results indicated that the sol-gel derived WO3 films with amorphous structure exhibited excellent gasochromic performance with good coloration change and fast response rate under ambient condition. The coloration kinetics was well fitted by exponential equation, indicating the coloration was a surface reaction-controlled process. A new model based on double-injection concept is proposed. According to the model, it is found that the hydrogen insertion coefficient (x) in the gasochromic colored tungsten bronze state (HxWO3) of the studied sol-gel WO3 films is about 0.29, which is similar to the reported gasochromic and electrochromic studies.

Original languageEnglish
Pages (from-to)504-509
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume157
Issue number2
DOIs
Publication statusPublished - Oct 20 2011
Externally publishedYes

Fingerprint

Sol-gels
Hydrogen
gels
color
Thin films
hydrogen
thin films
Platinum
platinum
Tungsten
Opacity
Surface reactions
Spin coating
Bronze
bronzes
Gas mixtures
Field emission
surface reactions
gas mixtures
coating

Keywords

  • Gasochromic
  • Hydrogen sensor
  • Sol-gel
  • Tungsten bronze
  • Tungsten trioxide

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Hydrogen incorporation in gasochromic coloration of sol-gel WO3 thin films. / Chan, Chih Chieh; Hsu, Chia Wen; Chang, Chung Chieh; Hsu, Chao Sheng.

In: Sensors and Actuators, B: Chemical, Vol. 157, No. 2, 20.10.2011, p. 504-509.

Research output: Contribution to journalArticle

Chan, Chih Chieh ; Hsu, Chia Wen ; Chang, Chung Chieh ; Hsu, Chao Sheng. / Hydrogen incorporation in gasochromic coloration of sol-gel WO3 thin films. In: Sensors and Actuators, B: Chemical. 2011 ; Vol. 157, No. 2. pp. 504-509.
@article{2a1b1b2c7a1a4514ae0b7f69aee9bb33,
title = "Hydrogen incorporation in gasochromic coloration of sol-gel WO3 thin films",
abstract = "In the present work, nanostructured WO3 films were prepared by the sol-gel spin coating method. The as-prepared films were annealed at different temperatures and their structures were characterized by field-emission scanning electron microscopy and X-ray diffraction. A layer of platinum (Pt) was then sputtered onto the surface of WO3 films. The gasochromic properties of the prepared Pt/WO3 thin films were examined by use of optical transmittance under alternate exposures to various H2-N 2 gas mixture and air. The results indicated that the sol-gel derived WO3 films with amorphous structure exhibited excellent gasochromic performance with good coloration change and fast response rate under ambient condition. The coloration kinetics was well fitted by exponential equation, indicating the coloration was a surface reaction-controlled process. A new model based on double-injection concept is proposed. According to the model, it is found that the hydrogen insertion coefficient (x) in the gasochromic colored tungsten bronze state (HxWO3) of the studied sol-gel WO3 films is about 0.29, which is similar to the reported gasochromic and electrochromic studies.",
keywords = "Gasochromic, Hydrogen sensor, Sol-gel, Tungsten bronze, Tungsten trioxide",
author = "Chan, {Chih Chieh} and Hsu, {Chia Wen} and Chang, {Chung Chieh} and Hsu, {Chao Sheng}",
year = "2011",
month = "10",
day = "20",
doi = "10.1016/j.snb.2011.05.008",
language = "English",
volume = "157",
pages = "504--509",
journal = "Sensors and Actuators, B: Chemical",
issn = "0925-4005",
publisher = "Elsevier",
number = "2",

}

TY - JOUR

T1 - Hydrogen incorporation in gasochromic coloration of sol-gel WO3 thin films

AU - Chan, Chih Chieh

AU - Hsu, Chia Wen

AU - Chang, Chung Chieh

AU - Hsu, Chao Sheng

PY - 2011/10/20

Y1 - 2011/10/20

N2 - In the present work, nanostructured WO3 films were prepared by the sol-gel spin coating method. The as-prepared films were annealed at different temperatures and their structures were characterized by field-emission scanning electron microscopy and X-ray diffraction. A layer of platinum (Pt) was then sputtered onto the surface of WO3 films. The gasochromic properties of the prepared Pt/WO3 thin films were examined by use of optical transmittance under alternate exposures to various H2-N 2 gas mixture and air. The results indicated that the sol-gel derived WO3 films with amorphous structure exhibited excellent gasochromic performance with good coloration change and fast response rate under ambient condition. The coloration kinetics was well fitted by exponential equation, indicating the coloration was a surface reaction-controlled process. A new model based on double-injection concept is proposed. According to the model, it is found that the hydrogen insertion coefficient (x) in the gasochromic colored tungsten bronze state (HxWO3) of the studied sol-gel WO3 films is about 0.29, which is similar to the reported gasochromic and electrochromic studies.

AB - In the present work, nanostructured WO3 films were prepared by the sol-gel spin coating method. The as-prepared films were annealed at different temperatures and their structures were characterized by field-emission scanning electron microscopy and X-ray diffraction. A layer of platinum (Pt) was then sputtered onto the surface of WO3 films. The gasochromic properties of the prepared Pt/WO3 thin films were examined by use of optical transmittance under alternate exposures to various H2-N 2 gas mixture and air. The results indicated that the sol-gel derived WO3 films with amorphous structure exhibited excellent gasochromic performance with good coloration change and fast response rate under ambient condition. The coloration kinetics was well fitted by exponential equation, indicating the coloration was a surface reaction-controlled process. A new model based on double-injection concept is proposed. According to the model, it is found that the hydrogen insertion coefficient (x) in the gasochromic colored tungsten bronze state (HxWO3) of the studied sol-gel WO3 films is about 0.29, which is similar to the reported gasochromic and electrochromic studies.

KW - Gasochromic

KW - Hydrogen sensor

KW - Sol-gel

KW - Tungsten bronze

KW - Tungsten trioxide

UR - http://www.scopus.com/inward/record.url?scp=79959680634&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79959680634&partnerID=8YFLogxK

U2 - 10.1016/j.snb.2011.05.008

DO - 10.1016/j.snb.2011.05.008

M3 - Article

VL - 157

SP - 504

EP - 509

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

IS - 2

ER -