Gas sensing properties of WO3 thick film for NO2 gas dependent on process condition

Chung, Yong Keun; Kim, Mi Hyang; Um, Woo Sik; Lee, Hee Soo; Song, Jun Kwang; Choi, Sung Churl; Yi, Kang; Lee, Myung Jin; Chung, Kyu‐Rhim

doi:10.1016/s0925-4005(99)00243-9

Cited by 92 publications

(26 citation statements)

References 13 publications

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“…The effect of annealing temperatures is shown to have an effect on the properties of the film, and matching these temperatures to the requirements of the film is an important consideration. Chung et al [67] made thick-film sensors made of WO 3 using a screen printing method, the paste having been formed from ball milling WO 3 powder with ethanol for a day. The sensors were dried and fired for 1 h under 600, 700 and 800 °C, achieving films of about 30 µm.…”

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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“…Two n-type metal oxides were used: tungsten trioxide (WO 3 ) for its efficacy in detecting NO 2 and other oxidising gases 19,[31][32][33][34] , and indium oxide (In 2 O 3 ) for detection of peroxides and other explosive gases. [35][36][37][38][39] Overlayers and admixtures were created using two types of zeolite, H-Zeolite Socony Mobil (ZSM)-5 and Titanium Silicate (TS)-1.…”

Section: Materials and Analyte Selectionmentioning

confidence: 99%

“…47 NO 2 is a strong oxidant and toxic atmospheric pollutant, and was included as a comparison to the aliphatic nitro-compounds. 19,31,32,34 The two alcohols were 2-ethylhexanol, a long-chain alcohol which occurs as a plasticiser in C4 plastic explosive formulation and other explosives, 10 and ethanol, included as a comparison. Finally, ammonia was included, as a potential indicator of home-made explosives concocted from cleaning products.…”

Section: Materials and Analyte Selectionmentioning

confidence: 99%

Detection of explosive markers using zeolite modified gas sensors

et al. 2013

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Detection of hidden explosive devices is a key priority for security and defence personnel around the globe. Electronic noses, based on metal oxide semiconductors (MOS), are a promising technology for creating inexpensive, portable and sensitive devices for such a purpose. An array of seven MOS gas sensors was fabricated by screen printing, based on WO 3 and In 2 O 3 inks. The sensors were tested against six gases, including four explosive markers: nitromethane, DMNB (2,3-dimetheyl-2,3-dinitrobutane), 2-ethylhexanol and ammonia. The gases were successfully detected with good sensitivity and selectivity from the array. Sensitivity was improved by overlaying or admixing the oxides with two zeolites, H-ZSM-5 and TS-1, and each showed improved responses to -NO 2 and -OH moieties respectively. Admixtures in particular showed promise, with excellent sensitivity and good stability to humidity. Machine learning techniques were applied to a subset of the data and could accurately classify the gases detected, even when confounding factors were introduced.

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“…WO 3 has been extensively studied as a material suitable for NO 2 sensing (Chung et al, 1999;Jin et al, 2005) since it was shown that it indicated a higher sensitivity to NO 2 than to CO, H 2 , CH 4 , and i-C 4 H 10 (Akiyama et al, 1991). NO 2 sensors made of WO 3 nanowires have also been studied; the sensors made of nanowires formed by using thermal evaporation (Ponzoni et al, 2006) and solvothermal method (Rout et al, 2006) indicated high sensitivities to NO 2 in the range of parts per billion at high temperatures above 200°C.…”

Section: Wo 3 Nanowires Formed By Vapor Transportmentioning

confidence: 99%

Formation of Oxide Nanowires by Thermal Evaporation and Their Application to Gas Sensors

Yamazaki¹

2011

Nanowires - Implementations and Applications

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Gas sensing properties of WO3 thick film for NO2 gas dependent on process condition

Cited by 92 publications

References 13 publications

Metal oxide semiconductor gas sensors in environmental monitoring

Metal oxide semiconductor gas sensors in environmental monitoring

Detection of explosive markers using zeolite modified gas sensors

Formation of Oxide Nanowires by Thermal Evaporation and Their Application to Gas Sensors

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