Cross sensitivity and stability of NO2 sensors from WO3 thin film

Cantalini, C.; Pelino, M.; Sun, Hong‐Tao; Faccio, Marco; Santucci, S.; Lozzi, L.; Passacantando, M.

doi:10.1016/s0925-4005(97)80039-1

Cited by 118 publications

(38 citation statements)

References 14 publications

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“…The grains were most sensitive to both NO and NO 2 at sizes of 25 nm, the sensitivity increasing with concentration of the target gas. Cantalini et al [66] produced films of WO 3 of 150 nm thickness. The films were deposited, and then annealed at temperatures of 400, 500 and 600 °C for 1 h. The largest responses to NO 2 gas were found at working temperatures of 200 °C using the film annealed at 500 °C.…”

Section: Advances In Nitrous Oxide Sensorsmentioning

confidence: 99%

Metal oxide semiconductor gas sensors in environmental monitoring

Binions¹,

Naik²

2013

Semiconductor Gas Sensors

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Metal oxide semiconductor gas sensors are utilised in a variety of different roles and industries. They are relatively inexpensive compared to other sensing technologies, robust, lightweight, long lasting and benefit from high material sensitivity and quick response times. They have been used extensively to measure and monitor trace amounts of environmentally important gases such as carbon monoxide and nitrogen dioxide. In this review the nature of the gas response and how it is fundamentally linked to surface structure is explored. Synthetic routes to metal oxide semiconductor gas sensors are also discussed and related to their affect on surface structure. An overview of important contributions and recent advances are discussed for the use of metal oxide semiconductor sensors for the detection of a variety of gases-CO, NO x , NH 3 and the particularly challenging case of CO 2 . Finally a description of recent advances in work completed at University College London is presented including the use of selective zeolites layers, new perovskite type materials and an innovative chemical vapour deposition approach to film deposition.

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Section: Advances In Nitrous Oxide Sensorsmentioning

confidence: 99%

Metal oxide semiconductor gas sensors in environmental monitoring

Binions¹,

Naik²

2013

Semiconductor Gas Sensors

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“…[1][2][3] Coatings have been produced by a wide variety of techniques including solgel, [4][5][6] spin-coating, [7] electrochemical deposition, [8] vacuum physical vapour deposition (PVD), [9][10][11][12][13] thermal chemical vapour deposition (CVD) [14,15] and spray pyrolysis. [16][17][18] Solution methods are widely used but can result in film structural and durability constraints.…”

Section: Introductionmentioning

confidence: 99%

Growth of Thin Films of Molybdenum and Tungsten Oxides by Combustion CVD Using Aqueous Precursor Solutions

Davis

Benito

Sheel

et al. 2004

Chemical Vapor Deposition

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Using combustion chemical vapour deposition, layers of molybdenum and tungsten oxides have been deposited on glass and silicon at low temperatures. Inexpensive ammonium salts of molybdate and metatungstate ions were used as precursors and were delivered to the coating flame as an aqueous solution using a nebuliser. The resulting films were analysed by scanning electron microscopy (SEM), energy dispersive analysis of X-rays (EDAX), Rutherford backscattering (RBS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD).These indicate that the films are continuous, moderately smooth and consist of amorphous, disordered molybdenum and tungsten trioxides.

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“…Metal oxides, like WO3, Co3O4, CeO2, TiO2, Al2O3, SnO2 and ITO, are commonly used gas sensing materials in sensors for the NO2 detection. The detection limit of metal oxide semiconductor based NO2 sensors is typically a few dozen ppm [6][7][8][9][10][11][12][13][14]. An advantage of these sensors is their small weight, low cost, short response time, wide range of target gases and long lifetime -whereas a disadvantage is their relatively low sensitivity and selectivity, sensitivity to environmental factors and high energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Very Sensitive Optical System with the Concentration and Decomposition Unit for Explosive Trace Detection

Zakrzewska¹

2015

Metrology and Measurement Systems

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The vapour pressure of most explosives is very low. Therefore, the explosive trace detection is very difficult. To overcome the problem, concentration units can be applied. At the Institute of Optoelectronics MUT, an explosive vapour concentration and decomposition unit to operate with an optoelectronic sensor of nitrogen dioxide has been developed. This unit provides an adsorption of explosive vapours from the analysed air and then their thermal decomposition. The thermal decomposition is mainly a chemical reaction, which consists in breaking up compounds into two or more simple compounds or elements. During the heating process most explosive particles, based on nitro aromatics and alkyl nitrate, release NO2 molecules and other products of pyrolysis. In this paper, the most common methods for the NO2 detection were presented. Also, an application of the concentration and decomposition unit in the NO2 optoelectronic sensor has been discussed.

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Cross sensitivity and stability of NO2 sensors from WO3 thin film

Cited by 118 publications

References 14 publications

Metal oxide semiconductor gas sensors in environmental monitoring

Metal oxide semiconductor gas sensors in environmental monitoring

Growth of Thin Films of Molybdenum and Tungsten Oxides by Combustion CVD Using Aqueous Precursor Solutions

Very Sensitive Optical System with the Concentration and Decomposition Unit for Explosive Trace Detection

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