Density Gradient Strategy for Preparation of Broken In<sub>2</sub>O<sub>3</sub> Microtubes with Remarkably Selective Detection of Triethylamine Vapor

Yang, Wei; Feng, Liang; He, Sai-Huan; Liu, Lingyue; Liu, Shantang

doi:10.1021/acsami.8b09375

Cited by 91 publications

(34 citation statements)

References 57 publications

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“…The WO 3 /SnO 2 hetero-structure provides more electrons to oxygen than pure SnO 2 , then produces more O − species on the materials surface. Therefore, the hetero-structure exhibits better sensing properties (Wal et al, 2009; Lingyue and Shantang, 2018; Yang et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Hollow WO3/SnO2 Hetero-Nanofibers: Controlled Synthesis and High Efficiency of Acetone Vapor Detection

Shao

Huang

et al. 2019

Front. Chem.

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Metal oxide hetero-nanostructures have widely been used as the core part of chemical gas sensors. To improve the dispersion state of each constituent and the poor stability that exists in heterogeneous gas sensing materials, a uniaxial electro-spinning method combined with calcination was applied to synthesize pure SnO2 and three groups of WO3/SnO2 (WO3 of 0.1, 0.3, 0.9 wt%) hetero-nanofibers (HNFs) in our work. A series of characterizations prove that the products present hollow and fibrous structures composed of even nanoparticles while WO3 is uniformly distributed into the SnO2 matrix. Gas sensing tests display that the WO3/SnO2 (0.3 wt%) sensor not only exhibits the highest response (30.28) and excellent selectivity to acetone vapor at the lower detection temperature (170°C), 6 times higher than that of pure SnO2 (5.2), but still achieves a considerable response (4.7) when the acetone concentration is down to 100 ppb with the corresponding response/recovery times of 50/200 s, respectively. Such structure obviously enhances the gas sensing performance toward acetone which guides the construction of a highly sensitive acetone sensor. Meanwhile, the enhancement mechanism of such a special sensor is also discussed in detail.

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Section: Resultsmentioning

confidence: 99%

Hollow WO3/SnO2 Hetero-Nanofibers: Controlled Synthesis and High Efficiency of Acetone Vapor Detection

Shao

Huang

et al. 2019

Front. Chem.

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“…This leads to an increase in conductance and consequently an increase in response. At the working temperature of WO 3 film and AZO NP (400 °C), the O 2− ion species mainly interact with the gas molecules [55], according to the following equations for TEA (Equation (1) [24]), TMA (Equation (2) [28]), and NH 3 (Equation (3) [38]): 2false(C2H5false)3Nads+43Oads2−→ 12CO2gas+15H2Ogas + 2NO2gas+86e− 2CH33Nads+21Oads2−→ 6CO2gas+9H2Ogas + N2gas+42e− <...>…”

Section: Resultsmentioning

confidence: 99%

“…Various sensing materials have been investigated for the detection of N-containing compound gases. For the detection of tertiary amines (TMA, TEA), metal oxides, such as TiO 2 , WO 3 , MoO 3 , LaFeO 3 , SnO 2 , and ZnO, have been tested [20,21,22,23,24,25,26,27,28,29,30,31,32]. Sensing materials based on WO 3 , MoSe 2 , multi-walled C nanotubes, and graphene oxide have been reported to exhibit good sensitivity to NH 3 gas [33,34,35,36,37,38,39,40,41].…”

Section: Introductionmentioning

confidence: 99%

Selective Detection of Nitrogen-Containing Compound Gases

Yoo

Lee

Kim

et al. 2019

Sensors

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N-containing gaseous compounds, such as trimethylamine (TMA), triethylamine (TEA), ammonia (NH3), nitrogen monoxide (NO), and nitrogen dioxide (NO2) exude irritating odors and are harmful to the human respiratory system at high concentrations. In this study, we investigated the sensing responses of five sensor materials—Al-doped ZnO (AZO) nanoparticles (NPs), Pt-loaded AZO NPs, a Pt-loaded WO3 (Pt-WO3) thin film, an Au-loaded WO3 (Au-WO3) thin film, and N-doped graphene—to the five aforementioned gases at a concentration of 10 parts per million (ppm). The ZnO- and WO3-based materials exhibited n-type semiconducting behavior, and their responses to tertiary amines were significantly higher than those of nitric oxides. The N-doped graphene exhibited p-type semiconducting behavior and responded only to nitric oxides. The Au- and Pt-WO3 thin films exhibited extremely high responses of approximately 100,000 for 10 ppm of triethylamine (TEA) and approximately −2700 for 10 ppm of NO2, respectively. These sensing responses are superior to those of previously reported sensors based on semiconducting metal oxides. On the basis of the sensing response results, we drew radar plots, which indicated that selective pattern recognition could be achieved by using the five sensing materials together. Thus, we demonstrated the possibility to distinguish each type of gas by applying the patterns to recognition techniques.

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“…Additionally, it is defined that gas response value of sensors toward the target gas can be calculated on the basis of ( R gas − R air ) /R air (oxidizing gas) or ( R air − R gas ) /R gas (reducing gas), where R air and R gas represented the resistance of sensors in air and target gas, respectively . Likewise, the response/recovery time was defined as the time when the gas value reached 90% of the final equilibrium value …”

Section: Methodsmentioning

confidence: 99%

Room‐Temperature NO₂ Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO₂ Monolayer Array Film

Liu

Luo

et al. 2019

Adv Materials Inter

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It is, therefore, urgent to take actions to address this issue. To predict whether there is NO 2 gas in the surrounding environment, the effective detection technology was indispensable. So far, detection means for monitoring NO 2 gas can be classified as optical, [5][6][7] electrochemical, [8][9][10] and chemiresistive sensing [11][12][13] technology. However, regardless of using optical or electrochemical method, some drawbacks were inevitably encountered, including sophisticated and expensive apparatus, intricate sample treatment as well as the poor portability, which severely restricted their practical application in special occasions, such as in combustion and automotive monitoring systems. [14,15] Alternatively, by means of the merits of the low-cost, miniaturization, and easy integration, the chemiresistive-type sensing technology was thus a particular promising candidate for the realization of both on-site and real-time detection. Generally, thermal-activated and ultraviolet (UV)-light driven gas sensors stand for two complementary chemiresistivetype gas sensing technologies. [16,17] Even though the thermaldriven type provided high sensitivity with a rapid response/ recovery speed, it would suffer from high operating temperature. [18,19] Undesirably, maintaining high operating temperature during the gas sensing process undoubtedly leaded to the following issues. On the one hand, an explosive potential possibly occurred when sensors were exposed into flammable and explosive gases, such as H 2 , CO, CH 4 , and NO. On the other hand, the elevated temperature with a long time enabled the regrowth of grains, leading to the decrease of sensitivity and poor long-term stability. To avoid above issue, the low temperature NO 2 sensors are the ideal choice. At present, it can realize low temperature NO 2 sensing by the UV-light activation or without the presence of the UV-light irradiation. However, for the case of the absence of the UV-light activation, the NO 2 sensors usually show the very slow response/recovery speed, [20][21][22][23][24] which is bad for the practical detection application. Alternatively, the emergence of UV-light illuminated mode can effectively avoid above shortcomings, because it offers a very low working temperature and fast response/recovery speed. To date, the related researches about UV-light irradiated gas sensors have been appeared. For example, Jiang et al. used polyporous SnO 2 -ZnO composites as sensors to detect the formaldehyde gas under the Chemiresistive-type gas sensors, which are driven by the thermal activation, have exhibited extraordinary promise for the detection of air pollutions, such as highly toxic gas of nitrogen dioxide (NO 2 ), but are often limited to its high operating temperature, because of the raising explosive risk in inflammable gases. This study reports the construction of a close-packed SnO 2 monolayer film, and uses it as the NO 2 room-temperature sensing layer induced by ultraviolet (UV)-light irradiation. Such SnO 2 monolayer array film shows excellent s...

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Density Gradient Strategy for Preparation of Broken In₂O₃ Microtubes with Remarkably Selective Detection of Triethylamine Vapor

Cited by 91 publications

References 57 publications

Hollow WO3/SnO2 Hetero-Nanofibers: Controlled Synthesis and High Efficiency of Acetone Vapor Detection

Hollow WO3/SnO2 Hetero-Nanofibers: Controlled Synthesis and High Efficiency of Acetone Vapor Detection

Selective Detection of Nitrogen-Containing Compound Gases

Room‐Temperature NO₂ Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO₂ Monolayer Array Film

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Density Gradient Strategy for Preparation of Broken In2O3 Microtubes with Remarkably Selective Detection of Triethylamine Vapor

Cited by 91 publications

References 57 publications

Hollow WO3/SnO2 Hetero-Nanofibers: Controlled Synthesis and High Efficiency of Acetone Vapor Detection

Hollow WO3/SnO2 Hetero-Nanofibers: Controlled Synthesis and High Efficiency of Acetone Vapor Detection

Selective Detection of Nitrogen-Containing Compound Gases

Room‐Temperature NO2 Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO2 Monolayer Array Film

Contact Info

Product

Resources

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Density Gradient Strategy for Preparation of Broken In₂O₃ Microtubes with Remarkably Selective Detection of Triethylamine Vapor

Room‐Temperature NO₂ Gas Sensing with Ultra‐Sensitivity Activated by Ultraviolet Light Based on SnO₂ Monolayer Array Film