CO gas sensing performance of electrospun Co3O4 nanostructures at low operating temperature

Submicrochains composed of massage ball-like WO3@CuWO4 have been prepared via a simple Cu2+ intercalation method. WO3@CuWO4 submicrochains sensors displayed excellent sensing performance to CO gas at room temperature.

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Simple Route to Obtain Nanostructured CeO2 Microspheres and CO Gas Sensing Performance

Nanoscale Research Letters ◽

10.1186/s11671-017-1951-x ◽

2017 ◽

Vol 12 (1) ◽

Cited By ~ 8

Author(s):

Edgar R. López-Mena ◽

Carlos R. Michel ◽

Alma H. Martínez-Preciado ◽

Alex Elías-Zuñiga

Keyword(s):

Gas Sensing ◽

Simple Route ◽

Sensing Performance ◽

Co Gas

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Glycothermal Synthesis of VO2(B) Nanoparticles for Gas Sensing Application

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17167 ◽

2020 ◽

Vol 20 (3) ◽

pp. 1946-1954 ◽

Cited By ~ 5

Author(s):

Hongmei Zhu ◽

Zhengjie Zhang ◽

Xuchuan Jiang

Keyword(s):

Vanadium Dioxide ◽

Gas Sensing ◽

Operating Temperature ◽

Environmental Safety ◽

Vanadium Oxides ◽

Good Sensitivity ◽

Reaction Conditions ◽

The Family ◽

Sensing Application ◽

Sensing Performance

This study represents a facile but efficient glycothermal method for synthesis of vanadium dioxide, VO2(B) nanoparticles with various geometries from spheres to rods, flakes or their agglomeration structures, by controlling reaction conditions (e.g., vanadium resources, reducing agents and surfactants). The as-prepared VO2(B) nanoparticles were characterized in microstructure and composition, and also examined in terms of gas sensing performance. It was found that the VO2(B) nanoparticles exhibit a good sensitivity towards alcohols (ethanol, isopropanol, and butanol) and acetone at the optimised operating temperature of 300 °C. The gas sensing performance was further compared with other vanadium oxides investigated previously, such as V2O5, Na1.08V3O8. The plausible gas sensing mechanism of the as-prepared nanoparticles was discussed in detail. This study would expand the family of vanadium oxides that can be made as potential sensors for applications in detecting environmental safety and human health.

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Acetone Gas Sensing Properties of a Multiple-Networked Fe2O3-Functionalized CuO Nanorod Sensor

Journal of Nanomaterials ◽

10.1155/2015/830127 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 7

Author(s):

Sunghoon Park ◽

Hyejoon Kheel ◽

Gun-Joo Sun ◽

Taegyung Ko ◽

Wan In Lee ◽

...

Keyword(s):

Catalytic Activity ◽

Gas Sensing ◽

Operating Temperature ◽

Optimal Operating ◽

Sensing Properties ◽

Adsorption Sites ◽

Gas Sensing Properties ◽

Response And Recovery ◽

Cuo Nanorods ◽

Sensing Performance

Fe2O3-decorated CuO nanorods were prepared by Cu thermal oxidation followed by Fe2O3decoration via a solvothermal route. The acetone gas sensing properties of multiple-networked pristine and Fe2O3-decorated CuO nanorod sensors were examined. The optimal operating temperature of the sensors was found to be 240°C. The pristine and Fe2O3-decorated CuO nanorod sensors showed responses of 586 and 1,090%, respectively, to 1,000 ppm of acetone at 240°C. The Fe2O3-decorated CuO nanorod sensor also showed faster response and recovery than the latter sensor. The acetone gas sensing mechanism of the Fe2O3-decorated CuO nanorod sensor is discussed in detail. The origin of the enhanced sensing performance of the multiple-networked Fe2O3-decorated CuO nanorod sensor to acetone gas was explained by modulation of the potential barrier at the Fe2O3-CuO interface, highly catalytic activity of Fe2O3for acetone oxidation, and the creation of active adsorption sites by Fe2O3nanoparticles.

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Effective Parameter of Nano-CuO Coating on CO Gas-Sensing Performance and Heat Transfer Efficiency

Arabian Journal for Science and Engineering ◽

10.1007/s13369-020-05233-8 ◽

2021 ◽

Author(s):

M. H. Mahmood ◽

M. A. Maleque

Keyword(s):

Heat Transfer ◽

Grain Size ◽

Surface Area ◽

Gas Sensing ◽

Operating Conditions ◽

Transfer Efficiency ◽

Thermal Transfer ◽

Heat Transfer Efficiency ◽

Sensing Performance ◽

Co Gas

AbstractThe high gas-sensing performance of semiconductors is mainly due to the high surface-to-volume ratio because it permits a large exposed surface area for gas detection. This paper presents an evaluation study for the effects of nano-CuO coating parameters on the CO gas-sensing performance. The effects on gas-sensing performance and heat transfer efficiency of CuO coating were evaluated by investigating the effects of coating parameters (concentration, temperature, and solution speed) on thickness, grain size, and porosity. The CuO nanoparticle coatings were synthesized using the oxidation method at various operating conditions. Coating characteristics were investigated using X-ray diffraction, energy dispersive X-ray Spectroscopy, field emission scanning electron microscopy, and electrical resistivity meter. The average coating thickness, grain size, and porosity were around 13 μm, 48 nm, and 30%, respectively. The thermal transfer and gas-sensing properties of CuO coating were evaluated according to the total surface area of the coating formed at various operating conditions. The gas-sensing and thermal transfer performance were obtained from the optimization of coating parameters based on the coating morphology to achieve the highest contact surface area. The coating’s surface area was increased by 350 times, which improved the heat transfer efficiency of 96.5%. The result shows that the coating thickness increased with the increase in solution concentration and decrease the temperature. The results also show that the sensitivity of the coating for CO gas was increased by 50% due to the reduction of coatings grain size.

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Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

Molecules ◽

10.3390/molecules25010035 ◽

2019 ◽

Vol 25 (1) ◽

pp. 35 ◽

Cited By ~ 3

Author(s):

Kechuang Wan ◽

Jialin Yang ◽

Ding Wang ◽

Xianying Wang

Keyword(s):

Graphene Oxide ◽

Photoelectron Spectroscopy ◽

Gas Sensing ◽

Operating Temperature ◽

Characterization Methods ◽

X Ray ◽

Highly Sensitive ◽

Loading Amount ◽

Sno2 Nanofiber ◽

Sensing Performance

In this work, we reported a formaldehyde (HCHO) gas sensor with highly sensitive and selective gas-sensing performance at low operating temperature based on graphene oxide (GO)@SnO2 nanofiber/nanosheets (NF/NSs) nanocomposites. Hierarchical SnO2 NF/NSs coated with GO nanosheets showed enhanced sensing performance for HCHO gas, especially at low operating temperature. A series of characterization methods, including X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) were used to characterize their microstructures, morphologies, compositions, surface areas and so on. The sensing performance of GO@SnO2 NF/NSs nanocomposites was optimized by adjusting the loading amount of GO ranging from 0.25% to 1.25%. The results showed the optimum loading amount of 1% GO in GO@SnO2 NF/NSs nanocomposites not only exhibited the highest sensitivity value (Ra/Rg = 280 to 100 ppm HCHO gas) but also lowered the optimum operation temperature from 120 °C to 60 °C. The response value was about 4.5 times higher than that of pure hierarchical SnO2 NF/NSs (Ra/Rg = 64 to 100 ppm). GO@SnO2 NF/NSs nanocomposites showed lower detection limit down to 0.25 ppm HCHO and excellent selectivity against interfering gases (ethanol (C2H5OH), acetone (CH3COCH3), methanol (CH3OH), ammonia (NH3), methylbenzene (C7H8), benzene (C6H6) and water (H2O)). The enhanced sensing performance for HCHO was mainly ascribed to the high specific surface area, suitable electron transfer channels and the synergistic effect of the SnO2 NF/NSs and GO nanosheets network.

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