Indium Tin Oxide thin film gas sensors for detection of ethanol vapours

Vaishnav, V.S.; Patel, P. D.; Patel, N. G.

doi:10.1016/j.tsf.2005.04.006

Cited by 120 publications

(69 citation statements)

References 23 publications

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“…This conductivity increase accompanied with a reduction in the measured resistance. On the other hand, for n-type semiconductor, the chemisorbed oxygen on the surface reacts with the reductive gas species and the electrons trapped by oxygen are released into the conduction band of the semiconductor, leading to resistance decrease [23]. The operating temperature dependence of the sensing properties could result from changing the adsorption and desorption rates of oxygen ions on the metal-oxide surface [37].…”

Section: Resultsmentioning

confidence: 99%

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Peculiarities of Deposition Times on Gas Sensing Behaviour of Vanadium Oxide Thin Films

2016

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The importance of vanadium oxide in solid state science as a semiconductor encouraged us to prepare and investigate its microstructure and surface properties related to gas sensing characteristics. Hence, vanadium oxide thin films were deposited by spray pyrolysis method. The prepared films were placed in an electric circuit and the sensing characteristics of these films to ethanol vapors were studied. It was possible to find correlations between nanostructure and electrical properties of the obtained thin films and to optimize conditions of its synthesis. By X-ray diffraction, field emission scanning electron microscopy, and atomic force microscopy, the structure of the deposited films was determined. Based on atomic force microscopy results, the fractal analysis showed a decreasing trend of the fractal dimension (the slope of the log (perimeter) vs. log (area)) versus the deposition time. It was found that the film growth and gas response were affected by the deposition time. The operating temperature of the sensor was optimized for the best gas response. In accordance with our findings, the film deposited at the lowest deposition time (20 min) had the highest sensing response to ethanol.

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Section: Resultsmentioning

confidence: 99%

“…Ethyl alcohol is the most important alcohol owing to its various applications such as an alternative to automotive fuels. Ethanol is widely used as well in food industry, brewing process control, medical and clinical applications, and bio-technological processes [23].…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of Deposition Times on Gas Sensing Behaviour of Vanadium Oxide Thin Films

2016

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“…radio frequency (RF) Journal of the Korean Vacuum Society 20(3), 2011 In this study, all gas sensing measurements were carried out at room temperature and the gas concentration was varied from 100 to 1,000 ppm. Ag electrodes (0.5 cm The schematic diagram of the static measurement set-up used to measure the gas sensitivity was reported in a previous report [3].…”

Section: Methodsmentioning

confidence: 99%

Effect of Intermediate Metal on the Methanol Gas Sensitivity of ITO Thin Films

Lee¹,

Heo²,

Kong³

et al. 2011

Journal of the Korean Vacuum Society

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ITO thin films and gold (Au), copper (Cu) and nickel (Ni) intermediate ITO multilayer (ITO/Au/ITO, ITO/Cu/ITO, ITO/Ni/ITO) films were deposited on glass substrates with a reactive radio frequency and direct current magnetron sputtering system and then the effect of intermediate metal layer and annealing temperature on the methanol gas sensitivity of ITO films were investigated. Although both ITO and ITO/metal/ITO (IMI) film sensors have the same total thickness of 100 nm, IMI sensors have a sandwich structure of ITO 50 nm/metal 10 nm/ITO 40 nm. The change in the gas sensitivity of the film sensors caused by methanol gas ranging from 100 to 1000 ppm was measured at room temperature. The IAI film sensors showed the higher sensitivity than the other sensors. Finally, it is concluded that the ITO 50/Au 10/ITO 40 nm film sensors hasthe potential to be used as improved methanol gas sensor.

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“…In general transition metals serve as "accelerators" of various processes [19] and noble metals serve as "catalysts" and also decreases the sensor operation temperature [20]. Platinum (Pt) and Palladium (Pd) are the most used dopants due to their chemical inertness and high work function (~5.8 and ~5.4 eV, respectively) than the band gap (3.6 eV) of SnO2 [21][22][23][24][25]. In other hand, Copper (Cu) is the most used transition metal for doping due its comparable ionic radius as tin.…”

Section: Introductionmentioning

confidence: 99%

An Elaborated Study of CO Sensitivities of Cu, Pt and Pd Activated SnO<sub>2</sub> Sensors: Effect of Precipitation Agents, Dopants and Doping Methods

Karthik¹,

Gómez-Pozos²,

Rodríguez-Lugo³

et al. 2017

Preprint

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Abstract:In this work, we report synthesis of Cu, Pt and Pd doped SnO2 powders and their comparative CO gas sensing studies. Dopants were incorporated into SnO2 nanostructures using chemical and impregnation methods by using urea and ammonia as precipitation agents. The synthesized samples were characterized using X-ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM) and High resolution transmission electron microscopy (HR-TEM). The presence of dopants within the SnO2 nanostructures was evidenced from HR-TEM. Doped powders utilizing chemical methods with urea as precipitation agent presented higher sensitivities compared to the remaining, which is due to the formation of uniform and homogeneous particles resulted from the temperature assisted synthesis. The particle sizes of doped SnO2 nanostructures were in the range of 40-100 nm. An enhanced sensitivity around 1783 was achieved with Cu doped SnO2 when compared with two other dopants i.e., Pt (1200) and Pd: SnO2(502). The high sensitivity of Cu: SnO2 is due to formation of CuO and its excellent association and dissociation in the presence of CO with adsorbed atmospheric oxygen at sensor operation temperatures resulted in high conductance. Cu: SnO2 may be an alternative and cost effective sensor for industrial applications.

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Indium Tin Oxide thin film gas sensors for detection of ethanol vapours

Cited by 120 publications

References 23 publications

Peculiarities of Deposition Times on Gas Sensing Behaviour of Vanadium Oxide Thin Films

Peculiarities of Deposition Times on Gas Sensing Behaviour of Vanadium Oxide Thin Films

Effect of Intermediate Metal on the Methanol Gas Sensitivity of ITO Thin Films

An Elaborated Study of CO Sensitivities of Cu, Pt and Pd Activated SnO<sub>2</sub> Sensors: Effect of Precipitation Agents, Dopants and Doping Methods

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