Enhanced nitrogen oxide sensing performance based on tin-doped tungsten oxide nanoplates by a hydrothermal method

Wang, Chong; Guo, Lanlan; Xie, Ning; Kou, Xueying; Sun, Yangyang; Chuai, Xiaohong; Zhang, Sumei; Song, Hongwei; Wang, Yue; Lu, Geyu

doi:10.1016/j.jcis.2017.09.068

Cited by 24 publications

(10 citation statements)

References 31 publications

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“…As shown in Figure a, the R a value of the sensor based on 3% Sn/Co 3 O 4 is considerably larger than that of pure Co 3 O 4 -based sensor at a relatively low temperature of 160 °C when most of the absorbed oxygen molecules are not activated to chemisorbed oxygen species. One observes that the R a value of the 3% Sn/Co 3 O 4 -based sensor decreases steeply from 105.51 to 8.56 MΩ as the temperature increased from 160 to 180 °C and further decreased to 1.02 MΩ when the temperature raised to 240 °C, indicating that most of the absorbed oxygen molecules are transformed to chemisorbed oxygen ions by trapping electrons from the conduction band . Consequently, the hole concentration in the HAL sharply increased, augmenting the conductivity of the sensor.…”

Section: Results and Discussionmentioning

confidence: 98%

Novel Strategy to Prepare Mesoporous Sn-Doped Co₃O₄ Whiskers with High Sensitivity to Toluene

Zhang

Tang

Feng

et al. 2020

Ind. Eng. Chem. Res.

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Tremendous attention has been devoted to the development of high-performance gas sensors for practical applications because of their importance for our health and safety. The distinctive Sn-doped Co3O4 whiskers have been successfully prepared via a novel strategy involving the preparation and sintering of salicylic anion-intercalated Sn-doped cobalt layered hydroxide whiskers. The Sn-doped Co3O4 whiskers have smaller crystal sizes, lower crystallinity, and higher specific surface area than pure Co3O4. Notably, the sensor based on 3 at. % Sn-doped Co3O4 whiskers showed the highest response of 53.8–50 ppm of toluene at 240 °C, which was 7.6 times higher than that of the sensor based on pure Co3O4. Moreover, the 3 at. % Sn-doped Co3O4 whisker-based sensor also possesses the advantages of high selectivity, excellent repeatability, remarkable long-term stability, and low detection limit, indicating that the 3 at. % Sn-doped Co3O4 whiskers are a hopeful sensing material for the detection of toluene gas.

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Section: Results and Discussionmentioning

confidence: 98%

Novel Strategy to Prepare Mesoporous Sn-Doped Co₃O₄ Whiskers with High Sensitivity to Toluene

Zhang

Tang

Feng

et al. 2020

Ind. Eng. Chem. Res.

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“…The adoptive material system has changed from monocomponent oxide to binary, ternary, and even multicomponent composites in search of superior or unexpected gas-sensing properties. The following methods are used for composite fabrication: mechanical mixing, , chemical recombination, − chemical doping, − and solid solution. − …”

Section: Introductionmentioning

confidence: 99%

In/Fe Cospinning Nanowires for Triethylamine Gas Sensing

Zhang

Wang

et al. 2022

ACS Appl. Nano Mater.

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Solid solution is a type of substance with rich physicochemical properties and significant internal adjustability. Thus, it has been widely used in various areas, including gas sensing. In this study, several In/Fe oxide solid solutions were successfully synthesized using the cospinning method and annealing process. Affirmatively, the solute In 3+ substituted the original host Fe 3+ in lattices of iron oxide, and vice versa. Thus, phases of α-(Fe 1−x In x ) 2 O 3 and C-(Fe 1−x In x ) 2 O 3 solid solutions appeared in sequence as the proportion of In 3+ increased. When In 3+ was introduced, composite nanowires (NWs) became porous, but when the amount of In 3+ was increased, the gas permeability worsened. When the amount of In 3+ became comparable to that of Fe 3+ in the precursor, abundant amorphous regions emerged in the product due to the mutual interference between the respective crystallization courses of In 3+ and Fe 3+ . Satisfactorily, the gassensing properties of as-synthesized samples maintained a close relationship with the composition and structure. For example, the product with the highest response and fastest response time toward the triethylamine detection had a 20.0 mol % ratio of In 3+ in the precursor. However, despite having a higher initial resistance, the sensor response was reduced by overproportioned amorphous phases caused by excessive In 3+ addition. Importantly, the response time of the optimal Fe 1.6 In 0.4 O 3 NWs was only 4 s, and recovery speeds of Fe 3+ -containing samples maintained a positive correlation with the gas permeability of products. Band stuctures of samples were obtained to give a reasonable explanation on the gas-sensitivity improvement. This study will promote the application of solid solutions to a gas-sensing area.

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“…Many NO 2 sensing materials such as SnO 2 , 5,6 TiO 2 , 7,8 WO 3 , 9,10 and ZnO 11 have been investigated as solid-state gas sensor materials. Khuspe et al 6 prepared nanostructured SnO 2 to detect NO 2 gas at 200 C. 3D hierarchical ower-like WO 3 was applied by Wang et al 9 to detect NO 2 at 100 C. Using ZnO nanorods/TiO 2 materials, Zou et al 11 studied their detection of NO 2 gas at 180 C. Many efforts have been made to improve NO 2 gas detecting sensors, [12][13][14] but there are still some problems such as low sensitive response and high energy consumption.…”

Section: Introductionmentioning

confidence: 99%

“…Scheme 2 Schematic for the mechanism of NO 2 sensing for CoAl-LDHs. (a) SEM image of 3D flower-like CA-2 on Au electrode; (b and c) the model with response procedure of gas sensing; (d) I-V curve measured for CA-2 sensor in air and 50 ppm NO 2 exposure at RT; (e) IR spectra of CA-2 before and after NO 2 gas detection (CA-2 test NO 2 gas sensing for 2 h).21918 | RSC Adv., 2019,9,[21911][21912][21913][21914][21915][21916][21917][21918][21919][21920][21921] This journal is…”

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confidence: 99%

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Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature

Teng

et al. 2019

RSC Adv.

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The 3D flower-like CoAl-layered double hydroxide (CoAl-LDH) was successfully prepared using the functional template agent of fluoride ions via a facile one-step hydrothermal route. Various techniques proved that all the samples presented 3D flower-like microstructural morphology. Representatively, the CA-2 sample, which was synthesized with the molar ratio of Co : Al of 3.65 : 1, had considerably abundant pores in its thin nanosheets. The average pore size was 2-4 nm, the specific surface area was equal to 49.45 m 2 g À1 , and the thickness of nanosheets was approximately 3.068 nm. The CA-2 sample showed an excellent response to 0.01-100 ppm NO 2 with ultrafast response/recovery time at room temperature (RT). The detection limit of the sensor even reached 10 ppb. The superior gas sensing performance could be attributed to the synergistic effects of the functional template agent of fluoride ions and specific porous 3D flower-like nanostructure. The current study showed that the 3D flower-like CoAl-LDHs might a promising material in practical detection of NO 2 at RT. Scheme 2 Schematic for the mechanism of NO 2 sensing for CoAl-LDHs. (a) SEM image of 3D flower-like CA-2 on Au electrode; (b and c) the model with response procedure of gas sensing; (d) I-V curve measured for CA-2 sensor in air and 50 ppm NO 2 exposure at RT; (e) IR spectra of CA-2 before and after NO 2 gas detection (CA-2 test NO 2 gas sensing for 2 h).21918 | RSC Adv., 2019,9,[21911][21912][21913][21914][21915][21916][21917][21918][21919][21920][21921] This journal is

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Enhanced nitrogen oxide sensing performance based on tin-doped tungsten oxide nanoplates by a hydrothermal method

Cited by 24 publications

References 31 publications

Novel Strategy to Prepare Mesoporous Sn-Doped Co₃O₄ Whiskers with High Sensitivity to Toluene

Novel Strategy to Prepare Mesoporous Sn-Doped Co₃O₄ Whiskers with High Sensitivity to Toluene

In/Fe Cospinning Nanowires for Triethylamine Gas Sensing

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature

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Enhanced nitrogen oxide sensing performance based on tin-doped tungsten oxide nanoplates by a hydrothermal method

Cited by 24 publications

References 31 publications

Novel Strategy to Prepare Mesoporous Sn-Doped Co3O4 Whiskers with High Sensitivity to Toluene

Novel Strategy to Prepare Mesoporous Sn-Doped Co3O4 Whiskers with High Sensitivity to Toluene

In/Fe Cospinning Nanowires for Triethylamine Gas Sensing

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO2 detection at room temperature

Contact Info

Product

Resources

About

Novel Strategy to Prepare Mesoporous Sn-Doped Co₃O₄ Whiskers with High Sensitivity to Toluene

Novel Strategy to Prepare Mesoporous Sn-Doped Co₃O₄ Whiskers with High Sensitivity to Toluene

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature