Ni2O3-decorated SnO2 particulate films for methane gas sensors

Vuong, Nguyen Minh; Hiếu, Nguyễn Minh; Hieu, Hoang Nhat; Yi, Hwanpyo; Kim, Dojin; Han, Yong-Shik; Kim, Myungbae

doi:10.1016/j.snb.2013.10.117

Cited by 117 publications

(48 citation statements)

References 24 publications

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“…The concentration dependence of the responses for Au10-WO 3 and Au50-WO 3 are shown as the inset. Notably, the Au50-WO 3 sensor showed a reduced operating temperature in comparison with the SnO 2 -based methane sensors, as shown in our previous report23.…”

Section: Resultssupporting

confidence: 79%

Porous Au-embedded WO3 Nanowire Structure for Efficient Detection of CH4 and H2S

Vuong

Kim

2015

Sci Rep

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151

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We developed a facile method to fabricate highly porous Au-embedded WO3 nanowire structures for efficient sensing of CH4 and H2S gases. Highly porous single-wall carbon nanotubes were used as template to fabricate WO3 nanowire structures with high porosity. Gold nanoparticles were decorated on the tungsten nanowires by dipping in HAuCl4 solution, followed by oxidation. The surface morphology, structure, and electrical properties of the fabricated WO3 and Au-embedded WO3 nanowire structures were examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and current–voltage measurements. Formation of a nanowire structure resulted in significant enhancement in sensing response to H2S and CH4 gases. Furthermore, Au embedment into the WO3 nanowire structures remarkably improved the performance of the sensors. The increase in response performance of sensors and adsorption–desorption kinetic processes on the sensing layers were discussed in relation with the role of Au embedment.

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Section: Resultssupporting

confidence: 79%

Porous Au-embedded WO3 Nanowire Structure for Efficient Detection of CH4 and H2S

Vuong

Kim

2015

Sci Rep

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151

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“…The higher response of the Ni 2 O 3 -decorated WO 3 sensor compared with pure WO 3 sensor can be attributed to three possible reasons as discussed in our previous results. 6,7) First, with the addition of Ni 2 O 3 , p-n junction is formed at the interface between Ni 2 O 3 and WO 3 . The formation of the p-n junction did not directly enhance the response of the sensor; however, sensor response can be enhanced if the WO 3 channel was driven near the total depletion condition brought about by the formation of p-n junction.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental procedure is similar to that in previous works. 6,7) Bar-type Pt (120 nm)/Ti (30 nm) electrodes were patterned by sequential DC sputtering of Ti and Pt through a shadow mask. Tungsten (W, 99.99% purity) was then deposited by sputtering onto the patterned substrates through a shadow mask.…”

Section: Methodsmentioning

confidence: 99%

“…Following previous results, the optimum thickness of Ni 2 O 3 at the maximum response of the sensor was obtained at the arc-discharge time of 4 min. 6,7) Therefore, the arc-discharge time of Ni deposition in this study was performed for 4 min.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, a SnO 2 and In 2 O 3 thin films decorated with Ni 2 O 3 has been developed for a high-response methane sensor. 6,7) In this work, similar fabrication method was used to WO 3 film. The WO 3 film was prepared by W metal sputtering following oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Ni2O3 Decoration of WO3 Thin Film for High Sensitivity NH3 Gas Sensor

et al. 2015

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A facile method for fabricating thin films of granular tungsten oxide (WO 3 ) particles decorated with nickel oxide (Ni 2 O 3 ) nanoparticles was developed for high response NH 3 gas sensor. The WO 3 granular film was fabricated by sputter deposition of tungsten, followed by oxidation. Ni 2 O 3 nanoparticles were deposited onto the WO 3 film by arc-discharge deposition of single-wall carbon nanotubes (SWCNTs) with Ni catalyst nanowires, followed by burning the carbon nanotubes. The Ni nanoparticle catalysts deposited on the SWCNTs were then oxidized to Ni 2 O 3 . The Ni 2 O 3 nanoparticles on the surface exhibited a catalytic role in ammonia gas reactions. A maximum response of 13.5 at operating temperature of 250°C to 200 ppm NH 3 gas concentration was found. In addition, the gas sensing mechanism of Ni 2 O 3 decorated WO 3 film was also discussed in this study.

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Ni2O3-decorated SnO2 particulate films for methane gas sensors

Cited by 117 publications

References 24 publications

Porous Au-embedded WO3 Nanowire Structure for Efficient Detection of CH4 and H2S

Porous Au-embedded WO3 Nanowire Structure for Efficient Detection of CH4 and H2S

Ni<sub>2</sub>O<sub>3</sub> Decoration of WO<sub>3</sub> Thin Film for High Sensitivity NH<sub>3</sub> Gas Sensor

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