The mechanism of the formation of selective response of semiconductor gas sensor in mixture of CH4/H2/CO with air

Samotaev, Nikolay; Vasiliev, Alexey; Podlepetsky, B.; Соколов, А. В.; Pisliakov, A.V.

doi:10.1016/j.snb.2007.07.022

Cited by 67 publications

(35 citation statements)

References 12 publications

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“…These include modulation of temperature regime of sensors operation, such as pulsed-temperature [3] or cycled-temperature regime [4]. Another approach is the modulation of the sensor measurement principle.…”

Section: Open Accessmentioning

confidence: 99%

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH3 and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO2. Introducing palladium oxide provided high CO-sensitivity at 25-50 °C . Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150-200 °C , and selectivity to NH3 in presence of higher CO concentrations.

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Section: Open Accessmentioning

confidence: 99%

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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“…13 e 14. Pela análise das figuras é possível sugerir que este sensor recebeu algum tratamento para prover maior seletividade ao hidrogênio, por exemplo, pode ter sido acrescentada uma camada de SiO 2 sobre o SnO 2 o que é algo bastante difundido na literatura (21,23,24) . Ainda nas figuras pode ser observada uma leve separação das curvas que apresentam diferentes concentrações de metano, uma provável hipótese é a dissociação do metano sobre a superfície do dióxido de estanho em temperaturas da ordem e 300 ser observado que este sensor é mais sensível ao hidrogênio do que ao próprio monóxido de carbono.…”

Section: Sensibilidades Cruzadasunclassified

Sensoriamento de misturas de H2, CH4 e CO por meio de uma matriz de quimioresistores

Moreira¹,

Moreira²,

Filho³

2015

RBAV

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A determinação de cada espécie que compõe uma mistura gasosa tem sido alvo de muitas pesquisas. A fim de viabilizar uma aplicação de baixo custo para a determinação da concentração de espécies em uma mistura gasosa, neste trabalho é proposto um aparato para sensoriamento de H 2 , CH 4 e CO encontrados em gases combustíveis provenientes de gaseificadores. ABSTRACTThe achievement of the content of each component of a gas mixture from gasifiers has been a matter of several studies. In order to allow a low cost application for obtaining the concentrations in a gas mixture, this study proposes a set up for sensing, H 2 , CH 4 and CO found in fuel gases produced by gasifiers. The sensing is performed by commercially avaliable chemiresistors of SnO 2 . The proposed set up has a gas dilution system before proceeding the sensing step. The 125 different gas mixtures were using nitrogen as the carrier gas. The samples were evaluated under two different methods for sensor recovery: forced and natural. Based on the results, it was established that: the cross sensitivity of the CO and CH 4 sensors is too high while the H 2 sensor presents selectivity almost 100% and the natural recovery method showed improved results because of the better thermal stability of the system. An artificial neural network was developed with the purpose of overcoming the problem of cross sensitivities and indicated a maximum error of 0.1% for H 2 , 23% for CH 4 and 29% for CO.

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“…Our main goal in this work was to fabricate MEMS microhotplate with thermal response time comparable with the level typical for ceramic MEMS reported like example in Karpov et al (2013), Vasiliev et al (2008 and Vasiliev et al (2011) or screen-print technologies present in Samotaev et al (2013) and Samotaev et al (2007). Also additional requirements presented in Samotaev et al (2014 for material for microhotplate is stability up to 600 0 С for using in harsh environmental conditions where low power consumption of MEMS platform is not critical.…”

Section: Main Textmentioning

confidence: 99%

Fabrication of MEMS Platform for Sensors Applications by Laser Micro Engraving

et al. 2015

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The target of this work is the demonstration of advanced approaches able to provide rapid prototyping by using laser technology ceramic MEMS platforms for chemical sensor operating under harsh environmental conditions and, on the other hand, to assure microhotplate stable at high temperature, which can be used for the deposition of high working temperature gas sensing materials, for example, oxides of tin, gallium, zirconium and hafnium. As substrate ceramic material in work using alumina oxide

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The mechanism of the formation of selective response of semiconductor gas sensor in mixture of CH4/H2/CO with air

Cited by 67 publications

References 12 publications

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Sensoriamento de misturas de H2, CH4 e CO por meio de uma matriz de quimioresistores

Fabrication of MEMS Platform for Sensors Applications by Laser Micro Engraving

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