In situ construction and sensing mechanism of TiO2–WO3 composite coatings based on the semiconductor heterojunctions

Yao, Yangguang; Yuan, Jian-Hui; Chen, Xiaoxiao; Tan, Liming; Gu, Qingshan; Zhao, Wenjie; Chen, Jieshi

doi:10.1016/j.jmrt.2019.05.016

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…TiO 2 composited with ZnO, MoS 2 , MoO 3 , V 2 O 5 and WO 3 have been designed and successfully established, exhibiting improved gas sensing performances towards ethanol, NO 2 , alcohol and ammonia [ 33 , 55 , 76 , 77 , 78 ]. For example, the ZnO-decorated TiO 2 nanotube layer (prepared by anodic oxidation combined with atomic layer deposition) [ 76 ], TiO 2 /V 2 O 5 branched nanoheterostructures (synthesised by an electrospinning process followed by an annealing treatment) [ 33 ] and a TiO 2 -WO 3 composite (obtained via plasma spraying technology using mixed feedstock suspensions) [ 77 ] have each exhibited promising gas sensing performances to 1170 ppm ethanol, 100 ppm ethanol and 100 ppm NO 2 , respectively. α -Fe 2 O 3 composited with SnO 2 , In 2 O 3 and CdO have also been successfully synthesised through hydrothermal, carbon sphere template and co-precipitating processes, enabling excellent gas sensitivity towards acetone, TMA and CO, respectively [ 37 , 79 , 80 ].…”

Section: Nanostructured Metal Oxide Heterojunctions For High-performance Gas Sensorsmentioning

confidence: 99%

“…Besides the nanocomposites discussed above, sensors based on the n-n or n-p heterojunctions have also been assembled to enhance the gas sensing performances of metal oxides. TiO 2 composited with ZnO, MoS 2 , MoO 3 , V 2 O 5 and WO 3 have been designed and successfully established, exhibiting improved gas sensing performances towards ethanol, NO 2 , alcohol and ammonia [33,55,[76][77][78]. For example, the ZnO-decorated TiO 2 nanotube layer (prepared by anodic oxidation combined with atomic layer deposition) [76], TiO 2 /V 2 O 5 branched nanoheterostructures (synthesised by an electrospinning process followed by an annealing treatment) [33] and a TiO 2 -WO 3 composite (obtained via plasma spraying technology using mixed feedstock suspensions) [77] [86] were reported to show enhanced gas sensing properties towards acetone, formaldehyde and H 2 S, respectively.…”

Section: Gas Sensors Based On N-p Junctionsmentioning

confidence: 99%

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Metal Oxide Based Heterojunctions for Gas Sensors: A Review

et al. 2021

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The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

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Section: Nanostructured Metal Oxide Heterojunctions For High-performance Gas Sensorsmentioning

confidence: 99%

Section: Gas Sensors Based On N-p Junctionsmentioning

confidence: 99%

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

et al. 2021

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“…The composite of oxide semiconductor materials can produce unique interface effects and special properties different from those of its single component, which have a profound impact on the gas-sensing characteristics of gas sensors [67]. In terms of sensitivity, the initial resistance of the composite is much greater than that of the single semiconductor materials.…”

Section: Compounding Of Semiconductor Oxidesmentioning

confidence: 99%

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

2021

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Formaldehyde is a poisonous and harmful gas, which is ubiquitous in our daily life. Long-term exposure to formaldehyde harms human body functions; therefore, it is urgent to fabricate sensors for the real-time monitoring of formaldehyde concentrations. Metal oxide semiconductor (MOS) gas sensors is favored by researchers as a result of their low cost, simple operation and portability. In this paper, the mechanism of formaldehyde detection by gas sensors is introduced, and then the ways of ameliorating the response of gas sensors for formaldehyde detection in recent years are summarized. These methods include the control of the microstructure and morphology of sensing materials, the doping modification of matrix materials, the development of new semiconductor sensing materials, the outfield control strategy and the construction of the filter membrane. These five methods will provide a good prerequisite for the preparation of better performing formaldehyde gas sensors.

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“…The formation of n -n -type heterostructure leads to the creation of electron depletion layer in TiO 2 and electron accumulation layer in WO 3 (Figure 11b). The accumulation layer of WO 3 would be enhanced oxygen adsorption in air ambient [40,[48][49][50]64]. formation of n -WO 3 /n -TiO 2 heterostructure with accumulation and depletion layer.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

“…Yao et al[40] fabricated TiO 2 -WO 3 composite coatings and explained the enhanced methane sensing properties by creation of heterojunctions between TiO 2 and WO 3 interface. S.M.…”

mentioning

confidence: 99%

Enhanced ethanol sensing properties of WO3 modified TiO2 nanorods

Abdikadyr¹,

Kılıç²,

Alev³

et al. 2021

Turk J Chem

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Pristine and WO 3 decorated TiO 2 nanorods (NRs) were synthesised to investigate n-n-type heterojunction gas sensing properties. TiO 2 NRs were fabricated via hydrothermal method on fluorine-doped tin oxide coated glass (FTO) substrates. Then, tungsten was sputtered on the TiO 2 NRs and thermally oxidised to obtain WO 3 nanoparticles. The heterostructure was characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) spectroscopy. Fabricated sensor devices were exposed to VOCs such as toluene, xylene, acetone and ethanol, and humidity at different operation temperatures. Experimental results demonstrated that the heterostructure has better sensor response toward ethanol at 200 °C. Enhanced sensing properties are attributed to the heterojunction formation by decorating TiO 2 NRs with WO 3 .

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In situ construction and sensing mechanism of TiO2–WO3 composite coatings based on the semiconductor heterojunctions

Cited by 16 publications

References 32 publications

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Strategies for Improving the Sensing Performance of Semiconductor Gas Sensors for High-Performance Formaldehyde Detection: A Review

Enhanced ethanol sensing properties of WO3 modified TiO2 nanorods

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