Nanoparticle engineering for gas sensor optimisation: improved sol–gel fabricated nanocrystalline SnO2 thick film gas sensor for NO2 detection by calcination, catalytic metal introduction and grinding treatments

Diéguez, Ángel; Romano‐Rodríguez, A.; Morante, J.R.; Kappler, J. P.; Bârsan, Nicolae; Göpel, Wolfgang

doi:10.1016/s0925-4005(99)00258-0

Cited by 99 publications

(48 citation statements)

References 16 publications

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“…Other methods, based on modified sol -gel [20,21] and CVD [22] techniques as well as original approach, which uses mechanochemical milling [23] are also used to improve the gas sensor performance of nanostructured metal-oxide materials.…”

Section: Preparation Of Nanostructured Materials For Gas Sensor Applimentioning

confidence: 99%

Preparation and chemiresistive properties of nanostructured materials

Bochenkov

Sergeev

2005

Advances in Colloid and Interface Science

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Section: Preparation Of Nanostructured Materials For Gas Sensor Applimentioning

confidence: 99%

Preparation and chemiresistive properties of nanostructured materials

Bochenkov

Sergeev

2005

Advances in Colloid and Interface Science

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“…The tin dioxide was prepared by precipitation of SnC14 with ammonia in water [9]. After washing the gel for several times and measuring the concentration of chloride ions, the gel was ground and dried at 120 ~ in air.…”

Section: Preparation Of Sno 2 Nano Particles By Sol-gelmentioning

confidence: 99%

Investigation of the influence of solid ionic conductor admixtures on the performance of gas sensors based on tin oxide

Hetznecker

Kohler

Schönauer

et al. 2002

Ionics

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Abstract. Tin oxide is a well-known and widely used gas sensitive material for detection of toxic and hazardous gas components in air. Different admixtures such as catalysts, aliovalent ions and solid ionic conductors were ~ to improve the sensitivity, selectivity and stability of these sensors. For material preparation a sol-gel route is usually used and catalysts are added before sintering to improve the sensitivity and to favour the sensors to specific gas components. In this work we investigated the influence of added solid ionic conductors on the gas sensitivity of tin oxide based ceramic admixtures dependent on the relative parts of the oxidic sodium ionic conductor, the ionic conductivity and the grain size in relation to the tin oxide grains. Almost ideal model substances for these studies are solid electrolytes with the NASICON (Na~.xZr2SixP3.xO~ 2) structure. They can be prepared in the sol-gel route and in a solid state reaction as well resulting in different powder grain sizes. The sodium ionic conductivity of the solid electrolytes in the composition range 0 < x < 3 varies by several orders of magnitude. Both materials, the NASICON and the tin oxide, were characterized with respect to morphology and structure by BET and XRD measurements. Powders of tin oxide were homogeneously mixed with different NASICON powders, pressed as discs, sintered, and contacted with gold electrodes for measurements of the conductivity in air at various temperatures (200 ~ < T < 400 ~ For preparation of sensor layers the powder mixtures were transferred to a paste, screen printed on an alumina substrate with interdigital gold electrodes and sintered for gas sensitivity measurements. A dramatic sensitivity enhancement of the composite to alcohol and significant sensitivity reduction to other gases like CO, H2, NH3, CH4, C3H8 was found.

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“…Nevertheless, in order for CNT works efficiently as sensor particularly to detect various gas types, various metal needs to be doped to the surface of CNT [7,9]. Depending on the target gas, the selectivity of the sensor can be achieved by functionalities this CNT by electro-deposition or sputtering process with materials such as Tungsten or Tin Oxide [10,11]. The sensing mechanism is the change of electrical conductivity of the material of the sensor surface [12].…”

Section: Introductionmentioning

confidence: 99%

Low Dense CNT for Ultra-Sensitive Chemoresistive Gas Sensor Development

et al. 2015

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This work was aimed to develop chemoresistive base sensor on silicon platform. Carbon nanotube (CNT) with low density was grown on passive interdigitated (IDE) based sensor which later can be functionalized with other material for the selectivity of the targeted goals. Low dense CNT will provide a bigger area of the functionalities element adhered to the wall hence increase the sensitivity of the sensor. In situ CNT growth was achieved using a PECVD machine with the time parameter was varied targeting for low dense CNT grow in-between the IDE fingers. SEM analysis reveals that low dense CNT was evidence for growth time as short as 30 s and as the time increase, the density was also increasing. Resistive probing of the grown CNT samples shows a drop in resistance compared to non-grown CNT which confirmed that the CNT successfully conducting the electron. CO 2 gas testing shows that the low dense sensor shows better detection performance compared to high dense sensor. However, further study needs to be conducted to measure the level of amorphous carbon which determine the purity of the such CNT nanostructure.

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Nanoparticle engineering for gas sensor optimisation: improved sol–gel fabricated nanocrystalline SnO2 thick film gas sensor for NO2 detection by calcination, catalytic metal introduction and grinding treatments

Cited by 99 publications

References 16 publications

Preparation and chemiresistive properties of nanostructured materials

Preparation and chemiresistive properties of nanostructured materials

Investigation of the influence of solid ionic conductor admixtures on the performance of gas sensors based on tin oxide

Low Dense CNT for Ultra-Sensitive Chemoresistive Gas Sensor Development

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