Effect of composition on sensing properties of SnO2+In2O3 mixed nanostructured films

Трахтенберг, Л. И.; Герасимов, Г. Н.; Громов, В. Ф.; Белышева, Т. В.; Ilegbusi, Olusegun J.

doi:10.1016/j.snb.2012.01.064

Cited by 60 publications

(23 citation statements)

References 20 publications

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“…Meanwhile, as soon as the concentration of the oxygen anions (mainly O -) gets a saturation value, the height of potential barrier and the width of depletion 95 region will not change. 54 The width of depletion zone will directly decide the response of a sensor at low temperature ranges. When the sensors are exposed to NO 2 gas (oxidizing gas), NO 2 molecules are absorbed on the surface of both SnO 2 and uncovered SnO.…”

Section: Gas Sensing Mechanism Of the Sno 2 -Sno Composites With P-n mentioning

confidence: 99%

Fabrication of SnO₂–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO₂ gas

2015

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In this report, the fabrication of a novel SnO2-SnO nanostructure with p-n heterojunctions has been achieved through a facile one-pot and low-cost hydrothermal process. The structure and properties of the nanocomposite were analyzed with X-ray techniques and electron microscopy. HRTEM characterization showed that the p-n heterojunctions were formed with small n-type SnO2 nanocrystals dispersed on the surface of large p-type SnO crystals. Compared to the single SnO2-based material, a gas sensor fabricated from the SnO2-SnO composite exhibited an enhanced sensing performance for NO2 gas detection, with a limit of detection and sensitivity of 0.1 ppm and 0.26 ppm(-1), respectively, at a relatively low operating temperature (50 °C). Moreover, the p-n heterojunctions exhibited high sensing selectivity for NO2. Such a high sensing sensitivity and a low operating temperature make the SnO2-SnO p-n nanomaterial a promising gas sensor for practical NO2 gas detection. The improved sensing response characteristics of the hybrid material could be attributed to the p-n junctions formed through the in situ growth of SnO2 nanocrystals on SnO nanoplates. The present study is helpful for the design of novel gas sensing materials and the development of NO2 gas sensors.

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Section: Gas Sensing Mechanism Of the Sno 2 -Sno Composites With P-n mentioning

confidence: 99%

Fabrication of SnO₂–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO₂ gas

2015

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“…Consequently, the resulting metal-oxides composite can achieve sensitivity and selectivity for gas detection far exceeds those achievable performance with the individual constituent of the composite. Studies of sensory phenomena in metal-oxide composites have shown that there are certain optimum compositions for which sensitivity reach maximum values [21][22][23]. On the other hand, the literature survey reveals that metal oxide gas-sensors composition is an essential factor that affected the surface morphology of the film [24].…”

Section: Introductionmentioning

confidence: 99%

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

2018

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Polycrystalline CdO:In 2 O 3 thin films for gas sensor applications were prepared on glass and silicon substrates by using one-step spray pyrolysis technique from the aqueous solution of CdCl 2 and InCl 3 at a substrate temperature of 300 °C. The structure, surface morphology, and the optoelectronic properties of prepared films were characterized respectively by means of X-ray diffraction (XRD), atomic force microscope and UV-visible spectroscopy. Based on the XRD results, the polycrystalline nature of CdO films has been confirmed, and In 2 O 3 films were found to exhibit a preferred orientation along (222) diffracted plane. The grain size varies between 9.0 and 28.4 nm. The results of Hall effect measurement of CdO:In 2 O 3 thin films confirms that all films were an n-type semiconductor. The electrical properties of prepared thin films and their sensitivity to nitrogen dioxide (NO 2) gas are also studied. The influence of the operating temperature and In 2 O 3 concentration on the NO 2 response were investigated. It is found that all films are sensitive to NO 2 gas, and the ideal operating temperature for the film contented 20 vol% of In 2 O 3 was found to be 200 °C at a gas concentration of 25 ppm. The sensing mechanism of the CdO:In 2 O 3 thin film is discussed and attributed to electron transfer between the sensing element and NO 2 molecules.

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“…In recent years, numerous materials including semiconducting oxide materials, such as ZnO [1,2], ZrO 2 [3], CdO [4] and TiO 2 [5], organic compounds [6,7] and novel materials such as carbon nanotubes [8] and graphene [9,10] are exploited for ammonia detection due to their superior ammonia gas sensing properties. Composite system based sensors have been demonstrated good sensitivity and selectivity to a particular gas [11,12] by varying the type and composition of the components of the composite such as metal oxide-metal oxide [1,13], novel materials (carbon nanotube and graphene)-metal oxide [9,14], polymer-metal oxide [8,15] etc. For ammonia gas detection, many efforts have been made to pursue both high response and good selectivity.…”

Section: Introductionmentioning

confidence: 99%

Surface acoustic wave ammonia sensor based on ZnO/SiO2 composite film

Wang

Ma²,

et al. 2015

Journal of Hazardous Materials

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Effect of composition on sensing properties of SnO2+In2O3 mixed nanostructured films

Cited by 60 publications

References 20 publications

Fabrication of SnO₂–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO₂ gas

Fabrication of SnO₂–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO₂ gas

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

Surface acoustic wave ammonia sensor based on ZnO/SiO2 composite film

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Effect of composition on sensing properties of SnO2+In2O3 mixed nanostructured films

Cited by 60 publications

References 20 publications

Fabrication of SnO2–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO2 gas

Fabrication of SnO2–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO2 gas

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

Surface acoustic wave ammonia sensor based on ZnO/SiO2 composite film

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Product

Resources

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Fabrication of SnO₂–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO₂ gas

Fabrication of SnO₂–SnO nanocomposites with p–n heterojunctions for the low-temperature sensing of NO₂ gas