Detection of ethanol vapours with Al-incorporated ZnO thin films

Huan Hsung Hsu; Chun Kuo Tsai; Michelle Wang; Yeu Juin Tuan; H. Paul Wang

doi:10.1080/17458081003720654

Detection of ethanol vapours with Al-incorporated ZnO thin films

Huan Hsung Hsu, Chun Kuo Tsai, Michelle Wang, Yeu Juin Tuan, H. Paul Wang

Department of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Al₂O₃ has been incorporated in the nanosize ZnO (Al/ZnO) thin film to enhance its sensitivity (R_air/R_C2H5OH) to C₂H₅OH vapour. It is found that the Al/ZnO thin film has a high sensitivity (>20), which is much greater than the plain ZnO by at least 50%. The speciation of zinc in the Al/ZnO thin films during detection of C₂H₅OH (200 ppm) has also been studied by in situ X-ray absorption near edge structure (XANES) spectroscopy. The least-square fitted XANES spectra indicate that the main zinc species in the thin film are bulky ZnO (4100 nm) (5%) and nanosize ZnO (95%). At the temperature of 300 K, during sensing of C₂H₅OH, a small amount of Zn(OH)₂ (7%) is formed in the thin film. The chemical interaction between C₂H₅OH and ZnO has also been found by in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. The bond distance of Zn-O is decreased to 1.93Å during sensing of C₂H₅OH, which may be caused by the electron donating to ZnO during adsorption of C₂H₅OH (C₂H₅HO→Zn-O). In the absence of C₂H₅OH, the Zn-O bond distance is restored to 1.92Å.

Original language	English
Pages (from-to)	7-12
Number of pages	6
Journal	Journal of Experimental Nanoscience
Volume	6
Issue number	1
DOIs	https://doi.org/10.1080/17458081003720654
Publication status	Published - 2011 Feb 1

All Science Journal Classification (ASJC) codes

Bioengineering
Biomedical Engineering
Materials Science(all)

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title = "Detection of ethanol vapours with Al-incorporated ZnO thin films",

abstract = "Al2O3 has been incorporated in the nanosize ZnO (Al/ZnO) thin film to enhance its sensitivity (Rair/RC2H5OH) to C2H5OH vapour. It is found that the Al/ZnO thin film has a high sensitivity (>20), which is much greater than the plain ZnO by at least 50%. The speciation of zinc in the Al/ZnO thin films during detection of C2H5OH (200 ppm) has also been studied by in situ X-ray absorption near edge structure (XANES) spectroscopy. The least-square fitted XANES spectra indicate that the main zinc species in the thin film are bulky ZnO (4100 nm) (5%) and nanosize ZnO (95%). At the temperature of 300 K, during sensing of C2H5OH, a small amount of Zn(OH)2 (7%) is formed in the thin film. The chemical interaction between C2H5OH and ZnO has also been found by in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. The bond distance of Zn-O is decreased to 1.93{\AA} during sensing of C2H5OH, which may be caused by the electron donating to ZnO during adsorption of C2H5OH (C2H5HO→Zn-O). In the absence of C2H5OH, the Zn-O bond distance is restored to 1.92{\AA}.",

author = "Hsu, {Huan Hsung} and Tsai, {Chun Kuo} and Michelle Wang and Tuan, {Yeu Juin} and Wang, {H. Paul}",

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T1 - Detection of ethanol vapours with Al-incorporated ZnO thin films

AU - Hsu, Huan Hsung

AU - Tsai, Chun Kuo

AU - Wang, Michelle

AU - Tuan, Yeu Juin

AU - Wang, H. Paul

PY - 2011/2/1

Y1 - 2011/2/1

N2 - Al2O3 has been incorporated in the nanosize ZnO (Al/ZnO) thin film to enhance its sensitivity (Rair/RC2H5OH) to C2H5OH vapour. It is found that the Al/ZnO thin film has a high sensitivity (>20), which is much greater than the plain ZnO by at least 50%. The speciation of zinc in the Al/ZnO thin films during detection of C2H5OH (200 ppm) has also been studied by in situ X-ray absorption near edge structure (XANES) spectroscopy. The least-square fitted XANES spectra indicate that the main zinc species in the thin film are bulky ZnO (4100 nm) (5%) and nanosize ZnO (95%). At the temperature of 300 K, during sensing of C2H5OH, a small amount of Zn(OH)2 (7%) is formed in the thin film. The chemical interaction between C2H5OH and ZnO has also been found by in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. The bond distance of Zn-O is decreased to 1.93Å during sensing of C2H5OH, which may be caused by the electron donating to ZnO during adsorption of C2H5OH (C2H5HO→Zn-O). In the absence of C2H5OH, the Zn-O bond distance is restored to 1.92Å.

AB - Al2O3 has been incorporated in the nanosize ZnO (Al/ZnO) thin film to enhance its sensitivity (Rair/RC2H5OH) to C2H5OH vapour. It is found that the Al/ZnO thin film has a high sensitivity (>20), which is much greater than the plain ZnO by at least 50%. The speciation of zinc in the Al/ZnO thin films during detection of C2H5OH (200 ppm) has also been studied by in situ X-ray absorption near edge structure (XANES) spectroscopy. The least-square fitted XANES spectra indicate that the main zinc species in the thin film are bulky ZnO (4100 nm) (5%) and nanosize ZnO (95%). At the temperature of 300 K, during sensing of C2H5OH, a small amount of Zn(OH)2 (7%) is formed in the thin film. The chemical interaction between C2H5OH and ZnO has also been found by in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. The bond distance of Zn-O is decreased to 1.93Å during sensing of C2H5OH, which may be caused by the electron donating to ZnO during adsorption of C2H5OH (C2H5HO→Zn-O). In the absence of C2H5OH, the Zn-O bond distance is restored to 1.92Å.

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