Self-catalytic growth of hierarchical In2O3nanostructures on SnO2nanowires and their CO sensing properties

Her, Yung-Chiun; Chiang, Ching-Kuo; Jean, Sen-Tsun; Huang, Sing-Lin

doi:10.1039/c1ce06086d

Cited by 30 publications

(15 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is attributable to a reaction between the reducing gas molecules and adsorbed negative oxygen species occurring more easily than the oxygen to overcome the barrier to repopulating the vacant states of the oxide surfaces after desorption of oxygen on exposure to a reducing gas ambient [ 28 ]. Several oxide heterostructures have been found to show a recovery time longer than the response time in cyclic reducing gas-sensing tests [ 17 , 29 ]; this difference is associated with the high surface-to-volume ratio of nanostructures. In the current study, a larger surface area and the presence of heterointerfacial contact in the ZnO–ZFO heterostructures resulted in a higher acetone gas-sensing response and a shorter response time compared with those of pure ZnO; the recovery times differed only slightly.…”

Section: Resultsmentioning

confidence: 99%

Physical synthesis methodology and enhanced gas sensing and photoelectrochemical performance of 1D serrated zinc oxide–zinc ferrite nanocomposites

Liang¹,

Liu²,

Hsia³

2015

Nanoscale Res Lett

View full text Add to dashboard Cite

AbstractsWe successfully prepared one-dimensional ZnO–ZnFe2O4 (ZFO) heterostructures for acetone gas-sensing and photoelectrochemical applications, by using sputter deposition of ZFO crystallites on ZnO nanostructure templates. The nanoscale ZFO crystallites were homogeneously coated on the surfaces of the ZnO nanostructures. Electron microscope images revealed that the ZnO–ZFO heterostructures exhibited a serrated surface morphology. Coating the ZnO nanostructures with a ZFO aggregated layer appreciably enhanced their acetone gas-sensing capability at 250 °C in comparison with pure ZnO nanostructures. The presence of many depleted nanoscale ZFO crystallites, the rugged surface of the heterostructures, and electron depletion at the ZnO/ZFO interface might contribute to the enhanced acetone gas-sensing response. Furthermore, the larger surface area and higher light absorption of ZnO–ZFO relative to the surface area and light absorption of ZnO were correlated with a substantial enhancement of the photocurrent value of ZnO–ZFO in photoelectrochemical tests produced by the simulated solar light irradiation.

show abstract

Section: Resultsmentioning

confidence: 99%

Physical synthesis methodology and enhanced gas sensing and photoelectrochemical performance of 1D serrated zinc oxide–zinc ferrite nanocomposites

Liang¹,

Liu²,

Hsia³

2015

Nanoscale Res Lett

View full text Add to dashboard Cite

show abstract

“…For the synthesis of tin oxide (SnO 2 ) nanowires, a custom physical vapor deposition process (PVD) was used. It mainly consisted of an evaporation–condensation process based on the vapor liquid solid (VLS) mechanism [64,65,66,67].…”

Section: Methodsmentioning

confidence: 99%

Low-Power Detection of Food Preservatives by a Novel Nanowire-Based Sensor Array

Zappa

2019

Foods

View full text Add to dashboard Cite

Food preservatives are compounds that are used for the treatment of food to improve the shelf life. In the food industry, it is necessary to monitor all processes for both safety and quality of the product. An electronic nose (or e-nose) is a biomimetic olfactory system that could find numerous industrial applications, including food quality control. Commercial electronic noses are based on sensor arrays composed by a combination of different sensors, which include conductometric metal oxide devices. Metal oxide nanowires are considered among the most promising materials for the fabrication of novel sensing devices, which can enhance the overall performances of e-noses in food applications. The present work reports the fabrication of a novel sensor array based on SnO2, CuO, and WO3 nanowires deposited on top of μHPs provided by ams Sensor Solutions Germany GmbH. The array was tested for the discrimination of four typical compounds added to food products or used for their treatment to increase the shelf life: ethanol, acetone, nitrogen dioxide, and ozone. Results are very promising; the sensors array was able to operate for a long time, consuming less than 50 mW for each single sensor, and principal component analysis (PCA) confirmed that the device was able to discriminate between different compounds.

show abstract

“…Recently, many heterostructure composites such as SnO 2 /ZnO [ 19 , 20 ], TiO 2 /SnO 2 [ 21 ], SnO 2 /Fe 2 O 3 [ 22 ] have been prepared to be applied as gas sensing materials to obtain the sensitive and selective gas sensors. In 2 O 3 and SnO 2 heterostructure composites have also been synthesized to enhance the properties of sensors [ 23 , 24 , 25 ]. In 2 O 3 /SnO 2 heterojunction microstructures synthesized by a facile room temperature solid-state reaction route exhibited high response to chlorine [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Electrospinning Hetero-Nanofibers In2O3/SnO2 of Homotype Heterojunction with High Gas Sensing Activity

Yao

Sun

et al. 2017

Sensors

View full text Add to dashboard Cite

In2O3/SnO2 composite hetero-nanofibers were synthesized by an electrospinning technique for detecting indoor volatile organic gases. The physical and chemical properties of In2O3/SnO2 hetero-nanofibers were characterized and analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Energy Dispersive X-Ray Spectroscopy (EDX), specific surface Brunauer–Emmett–Teller (BET) and X-ray photoelectron spectroscopy (XPS). Gas sensing properties of In2O3/SnO2 composite hetero-nanofibers were measured with six kinds of indoor volatile organic gases in concentration range of 0.5~50 ppm at the operating temperature of 275 °C. The In2O3/SnO2 composite hetero-nanofibers sensor exhibited good formaldehyde sensing properties, which would be attributed to the formation of n-n homotype heterojunction in the In2O3/SnO2 composite hetero-nanofibers. Finally, the sensing mechanism of the In2O3/SnO2 composite hetero-nanofibers was analyzed based on the energy-band principle.

show abstract

Self-catalytic growth of hierarchical In₂O₃nanostructures on SnO₂nanowires and their CO sensing properties

Cited by 30 publications

References 28 publications

Physical synthesis methodology and enhanced gas sensing and photoelectrochemical performance of 1D serrated zinc oxide–zinc ferrite nanocomposites

Physical synthesis methodology and enhanced gas sensing and photoelectrochemical performance of 1D serrated zinc oxide–zinc ferrite nanocomposites

Low-Power Detection of Food Preservatives by a Novel Nanowire-Based Sensor Array

Electrospinning Hetero-Nanofibers In2O3/SnO2 of Homotype Heterojunction with High Gas Sensing Activity

Contact Info

Product

Resources

About