Au doped ZnO/SnO2 composite nanofibers for enhanced H2S gas sensing performance

Hung, Chu Manh; Phuong, Han Viet; Thinh, Vu Van; Hong, Le Thi; Thắng, Nguyễn Tất; Hạnh, Nguyễn Hồng; Nguyen, Quang Dich; Duy, Nguyễn Văn; Hiếu, Nguyễn Văn; Hòa, Nguyễn Đức

doi:10.1016/j.sna.2020.112454

Cited by 38 publications

(25 citation statements)

References 51 publications

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“…The exothermic peak from 180 to 320°C resulted from the thermal decomposition of polyvinylpyrrolidone and anhydrous zinc acetate in forming ZnO [12]. The observed exothermic peak from 320 to 480°C resulted from the thermal decomposition of stannous chloride during the formation of the SnO 2 nanocrystals [13][14]. In a temperature range of 480-510°C, the weight loss was due to the decomposition of organic residues in the belts.…”

Section: Morphology and Structural Characterizationmentioning

confidence: 99%

Electrospun ZnO-SnO2 Heterojunction Belts for Hydrogen Sensing

Bulemo

2023

Preprint

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Chemiresistive sensors are promising devices for H2 sensing in a broad range of applications including fuel cells, hydrogen storage systems, petroleum refinement, and diagnosis of oil-insulated transformers. Herein, electrospun ZnO-SnO2 belts were synthesized and applied as resistive-type sensing layers for H2 sensing. The ZnO-SnO2 belts containing 20 mol% of Zn relative to Sn showed a response (Ra/Rg) of 6.7, fast response speed (3.6 sec), and a distinguishable selectivity toward 5 ppm H2 at 400°C in the presence of HCHO, CH4, NH3, CO, and CO2. The sensor displayed a repeatable response when subjected to 15 cycles of alternate air and 5 ppm H2 exposure. A unique H2 sensing performance of the belts was attributed to their belt morphology, numerous surface pores, smaller crystal size, ZnO/SnO2 heterojunction, and ZnO metallization following H2 exposure.

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Section: Morphology and Structural Characterizationmentioning

confidence: 99%

Electrospun ZnO-SnO2 Heterojunction Belts for Hydrogen Sensing

Bulemo

2023

Preprint

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“…Y. [86]. Depending on the optimal doping concentration of Au, the gas sensitivity to H2S is enhanced by around 700%.…”

Section: Metal Oxide Doping Effectmentioning

confidence: 99%

A review on tin dioxide gas sensor: The role of the metal oxide doping, nanoparticles, and operating temperatures

Rzaij¹,

Nawaf²,

Ibrahim³

2022

World J. Adv. Res. Rev.

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Metal oxide gas sensors have many advantages over other solid-state gas monitoring devices, including low cost, ease of manufacture, and small design. However, the shape and structure of sensing materials have a considerable impact on the performance of such sensors, posing a significant challenge for gas sensing properties on materials or dense films to attain high-sensitivity characteristics. Various tin dioxide (SnO2) nanostructures have been devised to increase gas sensing characteristics such as sensitivity, selectivity, and response time, among other characteristics. An overview of the most well-known techniques for synthesizing gas-sensing films, as well as the influence of doping with various metal oxides, nanoparticle size, and operating temperature on the gas-sensing properties of such films, is discussed in this work. The gas sensing mechanisms and the gas detection techniques are presented in detail. The metal oxide doped SnO2 showed a strong response for SO2 and NO2 gases, whereas nanoparticle doping plays a crucial effect in increasing SnO2 sensitivity towards H2, H2S, NO2, CO, Ethanol, etc. Furthermore, the effect of operating temperature on SnO2 response is discussed in this report. SnO2 has a high sensitivity over a wide temperature range (100-350 °C).

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“… 10 Moreover, the oxides with different crystal structures as well as nanoparticle size may also lead to an increase in gas adsorption sites on the oxide surface and improve overall performance. 11 Therefore, heterostructures can greatly improve the sensitivity of sensors.…”

Section: Introductionmentioning

confidence: 99%

“…The width of this depletion layer can be changed by the exposed target gas, as a consequence of which conductivity is altered . Moreover, the oxides with different crystal structures as well as nanoparticle size may also lead to an increase in gas adsorption sites on the oxide surface and improve overall performance . Therefore, heterostructures can greatly improve the sensitivity of sensors.…”

Section: Introductionmentioning

confidence: 99%

“…For gas sensing, there are also many applications for medical and safety purposes as well as environmental monitoring requiring robust, compact, and high-performance H 2 S gas sensors. , It is well-known that polluted air contains dangerous gases, for example, O 3 , CO 2 , CH a , and CO, where H 2 S gas is corrosive and flammable with an infamous rotten egg smell. , Exposure to even low concentrations of H 2 S over a long period of time can cause negative effects on human health such as irritation of the nose, eyes, throat, and respiratory system. , In addition, identifying H 2 S in exhaled breath contributes to the detection of symptoms of a variety of oral diseases such as halitosis …”

Section: Introductionmentioning

confidence: 99%

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Nanometer-Thick ZnO/SnO₂ Heterostructures Grown on Alumina for H₂S Sensing

Akbari-Saatlu

Procek

Mattsson

et al. 2022

ACS Appl. Nano Mater.

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Designing heterostructure materials at the nanoscale is a well-known method to enhance gas sensing performance. In this study, a mixed solution of zinc chloride and tin (II) chloride dihydrate, dissolved in ethanol solvent, was used as the initial precursor for depositing the sensing layer on alumina substrates using the ultrasonic spray pyrolysis (USP) method. Several ZnO/SnO 2 heterostructures were grown by applying different ratios in the initial precursors. These heterostructures were used as active materials for the sensing of H 2 S gas molecules. The results revealed that an increase in the zinc chloride in the USP precursor alters the H 2 S sensitivity of the sensor. The optimal working temperature was found to be 450 °C. The sensor, containing 5:1 (ZnCl 2 : SnCl 2 ·2H 2 O) ratio in the USP precursor, demonstrates a higher response than the pure SnO 2 (∼95 times) sample and other heterostructures. Later, the selectivity of the ZnO/SnO 2 heterostructures toward 5 ppm NO 2 , 200 ppm methanol, and 100 ppm of CH 4 , acetone, and ethanol was also examined. The gas sensing mechanism of the ZnO/SnO 2 was analyzed and the remarkably enhanced gas-sensing performance was mainly attributed to the heterostructure formation between ZnO and SnO 2 . The synthesized materials were also analyzed by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray, transmission electron microscopy, and X-ray photoelectron spectra to investigate the material distribution, grain size, and material quality of ZnO/SnO 2 heterostructures.

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Au doped ZnO/SnO2 composite nanofibers for enhanced H2S gas sensing performance

Cited by 38 publications

References 51 publications

Electrospun ZnO-SnO2 Heterojunction Belts for Hydrogen Sensing

Electrospun ZnO-SnO2 Heterojunction Belts for Hydrogen Sensing

A review on tin dioxide gas sensor: The role of the metal oxide doping, nanoparticles, and operating temperatures

Nanometer-Thick ZnO/SnO₂ Heterostructures Grown on Alumina for H₂S Sensing

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Au doped ZnO/SnO2 composite nanofibers for enhanced H2S gas sensing performance

Cited by 38 publications

References 51 publications

Electrospun ZnO-SnO2 Heterojunction Belts for Hydrogen Sensing

Electrospun ZnO-SnO2 Heterojunction Belts for Hydrogen Sensing

A review on tin dioxide gas sensor: The role of the metal oxide doping, nanoparticles, and operating temperatures

Nanometer-Thick ZnO/SnO2 Heterostructures Grown on Alumina for H2S Sensing

Contact Info

Product

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Nanometer-Thick ZnO/SnO₂ Heterostructures Grown on Alumina for H₂S Sensing