Improvement in gas sensitivity of ZnO thick film to volatile organic compounds (VOCs) by adding TiO2

Zhu, Bicheng; Xie, Changsheng; Wang, W.Y.; Huang, Kai; Hu, Jianglin

doi:10.1016/s0167-577x(03)00582-2

Cited by 211 publications

(78 citation statements)

References 9 publications

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“…The possible sensing mechanisms of VOCs on metal oxides at a generic temperature, could be described by means of the equation (1) for oxygen adsorption and equations (2-4) for VOC sensing [43,44]:…”

Section: Operating Principle and Detection Mechanisms Of Semiconductimentioning

confidence: 99%

Detection of hazardous volatile organic compounds (VOCs) by metal oxide nanostructures-based gas sensors: A review

Mirzaei

Leonardi

Neri

2016

Ceramics International

915

389

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Section: Operating Principle and Detection Mechanisms Of Semiconductimentioning

confidence: 99%

Detection of hazardous volatile organic compounds (VOCs) by metal oxide nanostructures-based gas sensors: A review

Mirzaei

Leonardi

Neri

2016

Ceramics International

915

389

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“…Compared with pure ZnO sensors, the 7 at% Sn-doped ZnO sensors had a fast response and recovery time. B. L. Zhu et al also researched the gas sensor of thick film ZnO, however, the response and recovery time was around 10 and 5 s, respectively, at operating temperature>320°C 15 . We also observed that the initial output voltage (Vout) of sensor C was higher than sensor D, which indicated that the resistance of C is lower than D. As is known to us all, Sn atoms can rearrange themselves into more suitable positions during the annealing process, which had been identified by the XRD spectra, and generate a new dopant energy below the conduction band of ZnO 11 .…”

Section: The Effect Of Visible Light For Sn-doped Zno Gas Sensorsmentioning

confidence: 99%

“…It is well known that the sensing mechanism of ZnO-based sensors belongs to the surface-controlled type, that is, the resistance change is controlled by the species and amount of chemisorbed oxygen on surface 15 . The ethanolsensing mechanism of the pure ZnO film may be explained as follows.…”

Section: Sensing Mechanismmentioning

confidence: 99%

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

et al. 2014

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Pure ZnO and 5at%, 7at%, 9at% Sn-doped ZnO materials are prepared by the chemical coprecipitation method. They were annealed by furnace at temperature range of 300-700°C in air for 1h. The ZnO materials are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the Sn-doped ZnO materials appear rough porous structures. The maximum sensitivity can be achieved by doping the amount of 7 at%. It has much better sensing performance towards ethanol vapor under visible light irradiation. The response and recovery time are ~1s and ~5s, respectively. The mechanism for the improvement in the sensing properties can be explained with the surface adsorption theory and the photoactivation theory.

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“…Both reactions take electrons from the conduction band of ZnO, which is an ntype semiconducting oxide [22,23], resulting in an increase in resistivity. ZnO nanowires have high concentrations of oxygen vacancies due to oxygen deficiencies, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Dependence of the gas sensing properties of ZnO nanowires on their microstructure

Park

Jin

et al. 2012

Appl. Phys. A

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Two different types of ZnO nanowires were synthesized by the thermal evaporation of different material powders: ZnS powders for ZnO nanowires A; and a mixture of ZnO and graphite powders for ZnO nanowires B. ZnO nanowires A were found to have a bamboo structure consisting of many hexagonal plates each of which is a single crystal, whereas ZnO nanowires B were single crystals with no grain boundary at all. ZnO nanowires B had a far higher degree of preferred orientation than ZnO nanowires A. The sensing properties of ZnO nanowires A were superior to those of ZnO nanowires B in terms of the sensing response and sensing speed. ZnO nanowires A showed an approximately 440 % response at 5 ppm NO 2 at 300°C, whereas ZnO nanowires B showed an approximately 150 % response under the same condition. ZnO nanowires A showed considerably shorter response and recovery times than ZnO nanowires B under the same condition. The superior sensing properties of ZnO nanowires A compared to ZnO nanowires B can be explained mainly by carrier modulation of the depletion layer formed across the grain boundaries of nanowires A.

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Improvement in gas sensitivity of ZnO thick film to volatile organic compounds (VOCs) by adding TiO2

Cited by 211 publications

References 9 publications

Detection of hazardous volatile organic compounds (VOCs) by metal oxide nanostructures-based gas sensors: A review

Detection of hazardous volatile organic compounds (VOCs) by metal oxide nanostructures-based gas sensors: A review

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

Dependence of the gas sensing properties of ZnO nanowires on their microstructure

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