Improving methane gas sensing properties of multi-walled carbon nanotubes by vanadium oxide filling

Chimowa, George; Tshabalala, Zamaswazi P.; Akande, Amos Adeleke; Bepete, George; Mwakikunga, Bonex W.; Ray, Suprakas Sinha; Benecha, Evans M.

doi:10.1016/j.snb.2017.02.167

Cited by 54 publications

(29 citation statements)

References 35 publications

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“…The induced local electric fields at the sharp edge of nanostructures at the interface are a function of reverse bias voltage for a Schottky diode. Experimentally, Singh et al [10] observed this phenomenon with Graphene/Silicon Schottky Diode. The device exhibited a high reverse bias dependent gas detection sensitivity, which enables molecular adsorption on its surface to alter the graphene/Si interface barrier height.…”

Section: Introductionmentioning

confidence: 85%

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Reverse biased nanocrystalline graphite (NCG)/p-Si schottky junction for methane gas sensor

Nawawi

Sultan

Rahmah

et al. 2019

IJEECS

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An investigation on the effect of the reverse biased operation of NCG/p-Si Schottky contact during methane gas exposure at room temperature has been presented. The experimental results show the larger current shift at the reverse bias operation, compared to the forward bias by exposing to methane gas. This can be attributed to the adsorption of methane gas into the metal surface layer and produces a negative charge at the junction, thus reduces the barrier height of the device. The reverse barrier height was calculated under the reverse bias condition, demonstrated the value decreased from 0.58-0.53eV towards a higher concentration of methane gas. The Schottky junction also affected by the increase in a free carrier when exposure to the reducing gas such as methane. Raman spectra are reported to be detected at G, D and 2D band with the grain size 1.88nm to exhibit single crystallite graphite properties. The results correlate well with the 3D AFM scans reveal the RMS surface roughness of 1.1 to 2.8nm.

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Section: Introductionmentioning

confidence: 85%

“…However, it requires high working temperature during the gas sensing operation. Recent years, the carbon nanomaterials have shown the unique properties in term of electrical, mechanical and optical in the area of gas sensing thus replacing the other well-established nanomaterials [4,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Reverse biased nanocrystalline graphite (NCG)/p-Si schottky junction for methane gas sensor

Nawawi

Sultan

Rahmah

et al. 2019

IJEECS

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“…Because of this, and the fact that their surface area reaches up to 1000 m 2 •g −1 [19], there is a particular interest in the application of CNTs in the field of gas sensing. There have been numerous reports on using CNTs as sensors of hydrogen [20], oxygen [21], methane [22], and many more [23][24][25][26], a prevailing number of which, however, operate at room temperature. Since a wide spectrum of processes in the industry actually takes place at elevated temperatures, it is of high importance to develop sensors able to work under non-standard conditions.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Gaseous Environment on the Electrical Conductivity of Multi-Walled Carbon Nanotube Films over a Wide Temperature Range

Janas

Kozioł

2020

Materials

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The surrounding gas atmosphere can have a significant influence on the electrical properties of multi-walled carbon nanotube (CNT) ensembles. In this study, we subjected CNT films to various gaseous environments or vacuum to observe how such factors alter the electrical resistance of networks at high temperatures. We showed that the removal of adsorbed water and other contaminants from the surface under reduced pressure significantly affects the electrical conductivity of the material. We also demonstrated that exposing the CNT films to the hydrogen atmosphere (as compared to a selection of gases of inert and oxidizing character) at elevated temperatures results in a notable reduction of electrical resistance. We believe that the observed sensitivity of the electrical properties of the CNT films to hydrogen or vacuum at elevated temperatures could be of practical importance.

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“…Table 1 [27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49] includes examples of conductometric sensors of various gases, except of NO 2 , with V 2 O 5 sensing material or V 2 O 5 as addition to other material such as SnO 2 [33,38], TiO 2 [40,50] and other [29,37,51,52,53,54]. On the other hand, Table 2 summarizes V 2 O 5 -based NO 2 sensors.…”

Section: Introductionmentioning

confidence: 99%

V2O5 Thin Films as Nitrogen Dioxide Sensors †

Schneider

Maziarz

2018

Sensors

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Vanadium pentoxide thin films were deposited onto insulating support by means of rf reactive sputtering from a metallic vanadium target. Argon-oxygen gas mixtures of different compositions controlled by the flow rates were used for sputtering. X-ray diffraction at glancing incidence (GIXD) and Scanning Electronic Microscopy (SEM) were used for structural and phase characterization. Thickness of the films was determined by the profilometry. It has been confirmed by GIXD that the deposited films are composed of V2O5 phase. The gas sensing properties of V2O5 thin films were investigated at temperatures from range 410–617 K upon NO2 gas of 4–20 ppm. The investigated material exhibited good response and reversibility towards nitrogen dioxide. The effect of metal-insulator transition (MIT) on sensor performance has been observed and discussed for the first time. It was found that a considerable increase of the sensor sensitivity occured above 545 K, which is related to postulated metal-insulator transition.

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Improving methane gas sensing properties of multi-walled carbon nanotubes by vanadium oxide filling

Cited by 54 publications

References 35 publications

Reverse biased nanocrystalline graphite (NCG)/p-Si schottky junction for methane gas sensor

Reverse biased nanocrystalline graphite (NCG)/p-Si schottky junction for methane gas sensor

The Effect of the Gaseous Environment on the Electrical Conductivity of Multi-Walled Carbon Nanotube Films over a Wide Temperature Range

V2O5 Thin Films as Nitrogen Dioxide Sensors †

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