Inside Back Cover: Single and networked CuO nanowires for highly sensitive p-type semiconductor gas sensor applications (Phys. Status Solidi RRL 3/2016)

This paper introduces a method for improving the sensitivity to NO2 gas of a p-type metal oxide semiconductor gas sensor. The gas sensor was fabricated using CuO nanowires (NWs) grown through thermal oxidation and decorated with ZnO nanoparticles (NPs) using a sol-gel method. The CuO gas sensor with a ZnO heterojunction exhibited better sensitivity to NO2 gas than the pristine CuO gas sensor. The heterojunction in CuO/ZnO gas sensors caused a decrease in the width of the hole accumulation layer (HAL) and an increase in the initial resistance. The possibility to influence the width of the HAL helped improve the NO2 sensing characteristics of the gas sensor. The growth morphology, atomic composition, and crystal structure of the gas sensors were analyzed using field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy, and X-ray diffraction, respectively.

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Pulsed laser deposition of metal oxide nanostructures for highly sensitive gas sensor applications

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2016.04.060 ◽

2016 ◽

Vol 236 ◽

pp. 978-987 ◽

Cited By ~ 25

Author(s):

Joni Huotari ◽

Ville Kekkonen ◽

Tomi Haapalainen ◽

Martin Leidinger ◽

Tilman Sauerwald ◽

...

Keyword(s):

Metal Oxide ◽

Pulsed Laser Deposition ◽

Gas Sensor ◽

Pulsed Laser ◽

Laser Deposition ◽

Sensor Applications ◽

Oxide Nanostructures ◽

Highly Sensitive ◽

Metal Oxide Nanostructures

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Electrospun In2O3/α-Fe2O3 heterostructure nanotubes for highly sensitive gas sensor applications

CrystEngComm ◽

10.1039/c3ce40962g ◽

2013 ◽

Vol 15 (33) ◽

pp. 6491 ◽

Cited By ~ 54

Author(s):

Changhui Zhao ◽

Guozhi Zhang ◽

Weihua Han ◽

Jiecai Fu ◽

Yongmin He ◽

...

Keyword(s):

Gas Sensor ◽

Sensor Applications ◽

Highly Sensitive

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A Hydrogen Gas Sensor Based on TiO2 Nanoparticles on Alumina Substrate

Sensors ◽

10.3390/s18082483 ◽

2018 ◽

Vol 18 (8) ◽

pp. 2483 ◽

Cited By ~ 9

Author(s):

Siti Mohd Chachuli ◽

Mohd Hamidon ◽

Md. Mamat ◽

Mehmet Ertugrul ◽

Nor Abdullah

Keyword(s):

Tio2 Nanoparticles ◽

Gas Sensor ◽

Operating Temperature ◽

Hydrogen Gas ◽

Optimum Operating ◽

Optimum Operating Temperature ◽

X Ray ◽

Semiconductor Gas Sensor ◽

Sensing Material ◽

P Type

High demand of semiconductor gas sensor works at low operating temperature to as low as 100 °C has led to the fabrication of gas sensor based on TiO2 nanoparticles. A sensing film of gas sensor was prepared by mixing the sensing material, TiO2 (P25) and glass powder, and B2O3 with organic binder. The sensing film was annealed at temperature of 500 °C in 30 min. The morphological and structural properties of the sensing film were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The gas sensor was exposed to hydrogen with concentration of 100–1000 ppm and was tested at different operating temperatures which are 100 °C, 200 °C, and 300 °C to find the optimum operating temperature for producing the highest sensitivity. The gas sensor exhibited p-type conductivity based on decreased current when exposed to hydrogen. The gas sensor showed capability in sensing low concentration of hydrogen to as low as 100 ppm at 100 °C.

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