Gas sensing properties of Cu2O and its particle size and morphology-dependent gas-detection sensitivity

2014 ◽  
Vol 2 (33) ◽  
pp. 13641-13647 ◽  
Author(s):  
Xuejuan Wan ◽  
Jilei Wang ◽  
Lianfeng Zhu ◽  
Jiaoning Tang
Keyword(s):  
Particle Size ◽  
Gas Sensing ◽  
Detection Sensitivity ◽  
Gas Detection ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Key Factor ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Sensing Performance

Particle size and morphology-dependent gas-detection sensitivity were studied, and the results indicated that the particle stacking mode is a key factor influencing gas sensing performance.

scholarly journals Effects of sintering temperature on sensing properties of WO 3 and Ag-WO 3 electrode for NO 2 sensor

2018 ◽  
Vol 5 (10) ◽  
pp. 171691 ◽  
Author(s):  
Rui Lu ◽  
Xiaoling Zhong ◽  
Shiguang Shang ◽  
Shan Wang ◽  
Manling Tang
Keyword(s):  
Particle Size ◽  
Calcination Temperature ◽  
Gas Sensing ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Different Temperatures ◽  
Size And Morphology

Pure WO 3 and Ag-WO 3 (mixed solid solutions Ag with WO 3 ) have been successfully synthesized by sol-gel method and the influences of calcination temperature on the particle size, morphology of the WO 3 and Ag-WO 3 nanoparticles were investigated. Powder X-ray diffraction results show that the hexagonal to monoclinic phase transition occurs at calcination temperature varying from 300°C to 500°C. SEM images show that calcination temperature plays an important role in controlling the particle size and morphology of the as-prepared WO 3 and Ag-WO 3 nanoparticles. The NO 2 gas sensing properties of the sensors based on WO 3 and Ag-WO 3 nanoparticles calcined at different temperatures were investigated and the experimental results exhibit that the gas sensing properties of the Ag-WO 3 sensors were superior to those of the pure WO 3 . Especially, the sensor based on Ag-WO 3 calcined at 500°C possessed larger response, better selectivity, faster response/recovery and better longer-term stability to NO 2 than the others at relatively low operating temperature (150°C).

scholarly journals Controllable synthesis and enhanced gas sensing properties of a single-crystalline WO3–rGO porous nanocomposite

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 14192-14199 ◽  
Author(s):  
Qin Hao ◽  
Tie Liu ◽  
Jingyuan Liu ◽  
Qi Liu ◽  
Xiaoyan Jing ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Gas Detection ◽  
Controllable Synthesis ◽  
Single Crystalline ◽  
Sensing Properties ◽  
Porous Nanostructures ◽  
Gas Sensing Properties ◽  
Porous Nanocomposite

A single-crystalline WO3–rGO composite has been successfully prepared and applied into gas detection. Impressively, this permit-3D porous nanostructures display enhanced NO2 sensing properties.

Synthesis and Gas Sensing Properties of SnO2 Nanostructures by Thermal Evaporation

2012 ◽  
Vol 620 ◽  
pp. 350-355 ◽  
Author(s):  
Wan Normiza Wan Mustapha ◽  
S.A. Rezan Sheikh Abdul Hamid ◽  
Sabar Derita Hutagalung ◽  
Nguyen Van Hieu ◽  
Khairudin Mohamed ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Thermal Evaporation ◽  
Gas Sensing ◽  
Oxide Phase ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Sensing Properties ◽  
Synthesis Conditions ◽  
Gas Sensing Properties ◽  
Size And Morphology

Tin oxide nanostructures (NS) were grown on silicon substrates by thermal evaporation method with three different parameters. These parameters were temperatures (650 °C, 750 °C and 850 °C), nickel catalyst concentrations (0, 5 and 10 milimoles) and tin powder source to substrate distances (2 cm, 4 cm and 6 cm). The parameters were found to affect the size and morphology of the synthesized nanostructures. Formation of nanospheres (NSs), nanoneedles (NNs) and nanowires (NWs) of tin oxide were observed by Scanning Electron Microscope (SEM) at different synthesis conditions. Synthesis temperature was found to have most pronounced effect on the size and morphology of the nanostructures. Catalyst concentration has affected the porosity and growth of the nanostructures. The distance between source and substrate affected the nanostructures predominately on distribution and particle size. Energy dispersion X-ray (EDX) analysis confirms the presence of tin and oxygen in all nanostructures at all synthesis conditions. X-ray diffraction (XRD) proves the formation of tin oxide phase in all samples. Significant formation of tin oxide nanowires was observed at 850 °C. Gas sensing properties of SnO2 nanowires (NW) toward ethanol (C2H5OH) gas at 450°C with different volume concentration was measured. It was found SnO2 NW had good sensing properties for C2H5OH at 100 ppm compared to measurements made at 25-50 ppm.

scholarly journals Tube in tube ZnO/ZnCo2O4 nanostructure synthesized by facile single capillary electrospinning with enhanced ethanol gas-sensing properties

RSC Advances ◽  
2017 ◽  
Vol 7 (19) ◽  
pp. 11428-11438 ◽  
Author(s):  
Khaled Tawfik Alali ◽  
Jingyuan Liu ◽  
Qi Liu ◽  
Rumin Li ◽  
Zhanshuang Li ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Tubular Structure ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Sensing Performance

Tube in tube nanostructure of ZnO/ZnCo2O4 was achieved using electrospinning technology. The complex tubular structure and n–p heterojunction are potential reasons for the excellent gas sensing performance of ZnO/ZnCo2O4 tube in tube nanostructure.

Flower-like In2O3 hierarchical nanostructures: synthesis, characterization, and gas sensing properties

RSC Advances ◽  
2014 ◽  
Vol 4 (91) ◽  
pp. 50241-50248 ◽  
Author(s):  
Dan Han ◽  
Peng Song ◽  
Huihui Zhang ◽  
Huihui Yan ◽  
Qi Xu ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Gas Sensing ◽  
Hierarchical Nanostructures ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
One Step ◽  
Ethanol Sensing ◽  
Sensing Performance

Flower-like In2O3 nanostructures with superior ethanol sensing performance were synthesized by annealing In(OH)3 precursor prepared via a one-step hydrothermal method.

Synthesis and Gas Sensing Properties of Palladium Doped Titanium Dioxide Nanoparticles

2013 ◽  
Vol 716 ◽  
pp. 74-77
Author(s):  
Fen Li ◽  
Qian Li ◽  
Xiao Pin Ma ◽  
Yan Yan Huang ◽  
Zhi Hong Jing
Keyword(s):  
Particle Size ◽  
Gas Sensing ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Optimum Concentration ◽  
Tetrabutyl Titanate ◽  
Palladium Chloride ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Doped Titanium Dioxide

Pd doped TiO2 nanoparticles were synthesized by sol-gel method with tetrabutyl titanate and palladium chloride as precursor materials. The products were characterized by XRD, SEM, FTIR and ICPOES technologies. The gas sensing properties of the products to 2-chloroethanol vapor were investigated. The results showed that the optimum concentration of Pd in the TiO2 nanoparticles was 3 mol% when the particle size of the anatase TiO2 nanoparticles was about 7 nm. Compared with pure TiO2 nanoparticles, the 3mol% Pd doped TiO2 nanoparticles exhibited higher gas sensing activities to 2-chloroethanol vapor.

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