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

2020 ◽  
Vol 20 (3) ◽  
pp. 1946-1954 ◽  
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.

Hydrothermal synthesis, characterization and gas sensing of Bi2MoxW1−xO6

2020 ◽  
Vol 13 (06) ◽  
pp. 2051032
Author(s):  
Li Zhang ◽  
Chengwen Song ◽  
Xiaoxing Zhang ◽  
Zhemin Shi ◽  
Jingkun Xiao
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Good Sensitivity ◽  
Good Property ◽  
X Ray ◽  
Transmission Electron ◽  
One Step ◽  
Sensing Application

Bi2MoxW[Formula: see text]O6 microspheres are synthesized by simple one-step hydrothermal method and the morphological characterizations are performed by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), BET, scanning electron microscopy (SEM), transmission electron microscopy (TEM). The gas sensing of Bi2WO6, Bi2MoO6 and Bi2MoxW[Formula: see text]O6 is investigated. It can be concluded that the sensor of Bi2MoxW[Formula: see text]O6 has the same good sensitivity as pure Bi2MoO6 and Bi2WO6 to alcohol. It is noteworthy that the operating temperature of Bi2Mo[Formula: see text]W[Formula: see text]O6 is 200∘C which is lower than that of pure Bi2WO6 or Bi2MoO6 (240∘C), so Bi2MoxW[Formula: see text]O6 show its good property for alcohol gas sensing application.

A voltage-controllable VO2 based metamaterial perfect absorber for CO2 gas sensing application

Nanoscale ◽  
2022 ◽  
Author(s):  
Xiaocan Xu ◽  
Ruijia Xu ◽  
Yu-Sheng Lin
Keyword(s):  
Vanadium Dioxide ◽  
Potential Application ◽  
Gas Sensing ◽  
Perfect Absorber ◽  
Co2 Gas ◽  
Tuning Mechanism ◽  
Gas Molecules ◽  
Sensing Application ◽  
Temperature Manipulation ◽  
Metamaterial Perfect Absorber

Vanadium dioxide (VO2) based metamaterial perfect absorbers (MPAs) have high potential application values in sensing gas molecules. However, such tuning mechanism via temperature manipulation lacks the compatibility to the electronic...

Facile h-MoO3 synthesis for NH3 gas sensing application at moderate operating temperature

2020 ◽  
Vol 325 ◽  
pp. 128974 ◽  
Author(s):  
Surendra Kumar ◽  
Ankit Singh ◽  
Rashmi Singh ◽  
Sanjai Singh ◽  
Pramod Kumar ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Sensing Application

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

2020 ◽  
Vol 303 ◽  
pp. 127193 ◽  
Author(s):  
C. Busacca ◽  
A. Donato ◽  
M. Lo Faro ◽  
A. Malara ◽  
G. Neri ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Co3o4 Nanostructures ◽  
Sensing Performance ◽  
Co Gas

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

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
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.

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

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 35 ◽  
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.

scholarly journals Low-Operating-Temperature NO2 Sensor Based on a CeO2/ZnO Heterojunction

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8269
Author(s):  
Kai Sun ◽  
Guanghui Zhan ◽  
Hande Chen ◽  
Shiwei Lin
Keyword(s):  
Hydrothermal Treatment ◽  
Room Temperature ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Nanorod Array ◽  
Gas Sensitivity ◽  
Anodic Electrodeposition ◽  
No2 Sensor ◽  
Higher Sensitivity ◽  
Sensing Performance

CeO2/ZnO-heterojunction-nanorod-array-based chemiresistive sensors were studied for their low-operating-temperature and gas-detecting characteristics. Arrays of CeO2/ZnO heterojunction nanorods were synthesized using anodic electrodeposition coating followed by hydrothermal treatment. The sensor based on this CeO2/ZnO heterojunction demonstrated a much higher sensitivity to NO2 at a low operating temperature (120 °C) than the pure-ZnO-based sensor. Moreover, even at room temperature (RT, 25 °C) the CeO2/ZnO-heterojunction-based sensor responds linearly and rapidly to NO2. This sensor’s reaction to interfering gases was substantially less than that of NO2, suggesting exceptional selectivity. Experimental results revealed that the enhanced gas-sensing performance at the low operating temperature of the CeO2/ZnO heterojunction due to the built-in field formed after the construction of heterojunctions provides additional carriers for ZnO. Thanks to more carriers in the ZnO conduction band, more oxygen and target gases can be adsorbed. This explains the enhanced gas sensitivity of the CeO2/ZnO heterojunction at low operating temperatures.

scholarly journals Ppb-Level Butanone Sensor Based on ZnO-TiO2-rGO Nanocomposites

Chemosensors ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 284
Author(s):  
Zhijia Liao ◽  
Yao Yu ◽  
Zhenyu Yuan ◽  
Fanli Meng
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Skin Irritation ◽  
Optimum Operating ◽  
Optimum Operating Temperature ◽  
Lower Detection Limit ◽  
Gas Sensing Properties ◽  
Lower Detection ◽  
Organic Gases ◽  
Sensing Performance

In this paper, ZnO-TiO2-rGO nanocomposites were successfully synthesized by the hydrothermal method. The morphology and structure of the synthesized nanomaterials were characterized by SEM, XRD, HRTEM, and XPS. Butanone is a typical ketone product. The vapors are extremely harmful once exposed, triggering skin irritation in mild cases and affecting our breathing in severe cases. In this paper, the gas-sensing properties of TiO2, ZnO, ZnO-TiO2, and ZnO-TiO2-rGO nanomaterials to butanone vapor were studied. The optimum operating temperature of the ZnO-TiO2-rGO sensor is 145 °C, which is substantially lower than the other three sensors. The selectivity for butanone vapor is greatly improved, and the response is 5.6 times higher than that of other organic gases. The lower detection limit to butanone can reach 63 ppb. Therefore, the ZnO-TiO2-rGO sensor demonstrates excellent gas-sensing performance to butanone. Meanwhile, the gas-sensing mechanism of the ZnO-TiO2-rGO sensor to butanone vapor was also analyzed.

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