Recent Advances of SnO2-Based Sensors for Detecting Fault Characteristic Gases Extracted From Power Transformer Oil

Zhang, Qingyan; Zhou, Qu; Lu, Zhaorui; Wei, Zhijie; Xu, Lingna; Gui, Yingang

doi:10.3389/fchem.2018.00364

Cited by 37 publications

(18 citation statements)

References 64 publications

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“…Currently, there are two common techniques-photo ionization detector (PID) and flame ionization detector (FID)-to detect VOCs, however, the application of these methods in industry are limited due to the relatively high cost and complicated maintenance. Considering the characteristics of small size, low cost, and convenient fabrication, semiconductor gas sensor technology plays an important role in many fields (Lu et al, 2018;Xiao et al, 2018;Zhang D. Z. et al, 2018;Zhang Q. Y. et al, 2018;Zhou et al, 2018cZhou et al, , 2019Wang et al, 2019a;Wei et al, 2020), so it is reasonable to propose the employment of a gas sensor to realize the online monitoring of VOCs.…”

Section: Introductionmentioning

confidence: 99%

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

Wang¹,

Zhou²,

Peng³

et al. 2020

Front. Chem.

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As a typical n-type semiconductor, MoO 3 has been widely applied in the gas-detection field due to its competitive physicochemical properties and ecofriendly characteristics. Volatile organic compounds (VOCs) are harmful to the atmospheric environment and human life, so it is necessary to quickly identify the presence of VOCs in the air. This review briefly introduced the application progress of an MoO 3-based sensor in VOCs detection. We mainly emphasized the optimization strategies of a high performance MoO 3 , which consists of morphology-controlled synthesis and electronic properties functional modification. Besides the general synthesis methods, its gas-sensing properties and mechanism were briefly discussed. In conclusion, the application status of MoO 3 in gas-sensing and the challenges still to be solved were summarized.

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Section: Introductionmentioning

confidence: 99%

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

Wang¹,

Zhou²,

Peng³

et al. 2020

Front. Chem.

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“…The safe and reliable operation of transformers is of vital importance for a stable and continuous power supply to the power grid (Lu et al, 2018;Zhang D. Z. et al, 2018;Zhang Q. Y. et al, 2018;Cui et al, 2019;Yang et al, 2019a,b). To date, the number of oil-immersed transformers accounts for more than 90% of the total number of power transformers, and the operating state of these power transformers will directly affect the condition of power systems (Zhou et al, 2016;.…”

Section: Introductionmentioning

confidence: 99%

Application of WO3 Hierarchical Structures for the Detection of Dissolved Gases in Transformer Oil: A Mini Review

Wei

Peng

et al. 2020

Front. Chem.

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Oil-immersed power transformers are considered to be one of the most crucial and expensive devices used in power systems. Hence, high-performance gas sensors have been extensively explored and are widely used for detecting fault characteristic gases dissolved in transformer oil which can be used to evaluate the working state of transformers and thus ensure the reliable operation of power grids. Hitherto, as a typical n-type metal-oxide semiconductor, tungsten trioxide (WO 3) has received considerable attention due to its unique structure. Also, the requirements for high quality gas detectors were given. Based on this, considerable efforts have been made to design and fabricate more prominent WO 3 based sensors with higher responses and more outstanding properties. Lots of research has focused on the synthesis of WO 3 nanomaterials with different effective and controllable strategies. Meanwhile, the various morphologies of currently synthesized nanostructures from 0-D to 3-D are discussed, along with their respective beneficial characteristics. Additionally, this paper focused on the gas sensing properties and mechanisms of the WO 3 based sensors, especially for the detection of fault characteristic gases. In all, the detailed analysis has contributed some beneficial guidance to the exploration on the surface morphology and special hierarchical structure of WO 3 for highly sensitive detection of fault characteristic gases in oil-immersed transformers.

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“…Tin dioxide (SnO 2 ) is considered as one of the leading n-type MOXs used in commercial chemoresistive gas sensors, however, the enhancement of its sensing performance remains active to date [9,10]. As mentioned above for other MOXs, a large series of reports has also emphasized the remarkable improvement of SnO 2 sensing characteristics, whether by adding catalysts, introducing functional activators, or doping with impurities [5,10,11]. The latter has proved to be an efficient way to create more oxygen vacancies and to amplify the electrochemical reaction of analytes on the layer's surface [7,12].…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, there are several examples of noble metals (Pd, Pt), rare earth metals (Ce, Pr), and metals (Zn, Al) improving the sensitivity and selectivity of various MOXs including SnO 2 [10,[12][13][14][15][16]. Among these materials, magnesium (Mg) is attractive, as it has proved to improve sensitivity to ethanol, H 2 , CO, and ammonia when incorporated into ZnO to form Mg-doped ZnO [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

Bendahmane

Tomić

Touidjen

et al. 2020

Sensors

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This work presents the effect of magnesium (Mg) doping on the sensing properties of tin dioxide (SnO2) thin films. Mg-doped SnO2 films were prepared via a spray pyrolysis method using three doping concentrations (0.8 at.%, 1.2 at.%, and 1.6 at.%) and the sensing responses were obtained at a comparatively low operating temperature (160 °C) compared to other gas sensitive materials in the literature. The morphological, structural and chemical composition analysis of the doped films show local lattice disorders and a proportional decrease in the average crystallite size as the Mg-doping level increases. These results also indicate an excess of Mg (in the samples prepared with 1.6 at.% of magnesium) which causes the formation of a secondary magnesium oxide phase. The films are tested towards three volatile organic compounds (VOCs), including ethanol, acetone, and toluene. The gas sensing tests show an enhancement of the sensing properties to these vapors as the Mg-doping level rises. This improvement is particularly observed for ethanol and, thus, the gas sensing analysis is focused on this analyte. Results to 80 ppm of ethanol, for instance, show that the response of the 1.6 at.% Mg-doped SnO2 film is four times higher and 90 s faster than that of the 0.8 at.% Mg-doped SnO2 film. This enhancement is attributed to the Mg-incorporation into the SnO2 cell and to the formation of MgO within the film. These two factors maximize the electrical resistance change in the gas adsorption stage, and thus, raise ethanol sensitivity.

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Recent Advances of SnO2-Based Sensors for Detecting Fault Characteristic Gases Extracted From Power Transformer Oil

Cited by 37 publications

References 64 publications

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

Volatile Organic Compounds Gas Sensors Based on Molybdenum Oxides: A Mini Review

Application of WO3 Hierarchical Structures for the Detection of Dissolved Gases in Transformer Oil: A Mini Review

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

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