Fe<sub>2</sub>O<sub>3</sub>/Carbon Nanotube-Based Resistive Sensors for the Selective Ammonia Gas Sensing

Muthukumaran, P.; Sumathi, C.; Wilson, J.H.; Sekar, C.; Leonardi, Salvatore Gianluca; Neri, Gaia

doi:10.1166/sl.2014.3220

Cited by 21 publications

(10 citation statements)

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“…Sp 3 was attributed to amorphous carbon/defects in the nanotube structure, which, at this defect, could be grafted to the -OH and -C-O [40,41]. It is widely recognized that the mixing of oxide NPs by the formation of nucleus Fe + on CNTs induces damage in CNTs [25]. However, our method did not further significantly affect the CNTs due to the Fe spontaneously grow and uniformly assemble on the entire surface of each nanotube by CVD.…”

Section: Xps Analyses the Xps Technique Is Used To Analyzementioning

confidence: 88%

“…In -Fe 2 O 3 /CNT thin films, peak at 100 eV is observed and corresponds to silicon of silicon substrate; this is because of the ultra-thin films of the Fe 2 O 3 /CNTs. In addition, the atomic percent (At%) [25].…”

Section: Xps Analyses the Xps Technique Is Used To Analyzementioning

confidence: 99%

“…Journal of Nanomaterials 9 According to (1)- (3), the oxygen extracts electrons from the conduction band of Fe 2 O 3 to form O 2 − (at room temperature), leading to an increase in resistance [25]. When Fe 2 O 3 is exposed to LPG (C H 2 +2 ), O 2 − on the film surface interacts with the LPG molecules and produces gas intermediates (C H 2 : O), water (H 2 O) vapor, and electron.…”

Section: Lpg Sensing Mechanismmentioning

confidence: 99%

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Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

Chaitongrat

Chaisitsak

2018

Journal of Nanomaterials

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We present performance of a room temperature LPG sensor based on -Fe 2 O 3 /CNT (carbon nanotube) nanocomposite films. The nanocomposite film was fabricated via the metallic Fe catalyst particle on CNTs in which both the catalyst particles and the CNT were simultaneously synthesized by chemical vapor deposition (CVD) synthesis and were subsequently annealed in air to create -Fe 2 O 3 . These methods are simple, inexpensive, and suitable for large-scale production. The structure, surface morphologies, and LPG response of nanocomposite films were investigated. Raman spectroscopy and XPS analysis showed the formation of -Fe 2 O 3 on small CNTs (SWNTs). Morphological analysis using FE-SEM and AFM revealed the formation of the porous surface along with roughness surface. Additionally, the sensing performance of -Fe 2 O 3 /CNTs showed that it could detect LPG concentration at lower value than 25% of LEL with response/recovery time of less than 30 seconds at room temperature. These results suggest that the -Fe 2 O 3 /CNTs films are challenging materials for monitoring LPG operating at room temperature.

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Section: Xps Analyses the Xps Technique Is Used To Analyzementioning

confidence: 88%

Section: Xps Analyses the Xps Technique Is Used To Analyzementioning

confidence: 99%

Section: Lpg Sensing Mechanismmentioning

confidence: 99%

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Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

Chaitongrat

Chaisitsak

2018

Journal of Nanomaterials

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“…As we all know, complex synthesis methods increase experimental costs, and may also produce a lot of toxic and harmful substances, which is not conducive to laboratory experiments and industrial production. [20][21][22] Therefore, using a facile and general method to synthesize Co 3 O 4 , ZnO and NiO with hierarchically porous structures has offered hope towards solving this problem. In order to enhance strong points and avoid weaknesses, the use of a convenient synthesis method to obtain high performance gas-sensing materials has become extremely essential and urgent.…”

Section: 16mentioning

confidence: 99%

General fabrication and enhanced VOC gas-sensing properties of hierarchically porous metal oxides

et al. 2017

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A facile and general route to synthesize hierarchically porous metal oxide nanostructures was reported here. The results indicate that the hierarchically porous metal oxides show high sensitivity to toxic or dangerous gases. The signal sensitivity of the gas sensors exhibits a good linear relation with the VOC gas concentration. As one of the as-synthesized hierarchically porous metal oxides, ZnO exhibits the lowest detection limit of 15 ppb for formaldehyde, which is much lower than the limit value of indoor formaldehyde (60 ppb). Furthermore, the sensitivity of the ZnO porous nanosheets decorated with Au nanoparticles is 10 ppb for formaldehyde, which is about 1.5 times higher than that of the unmodified ZnO porous nanosheets.

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“…19 20 Sensors based on hybrid nanostructures such as -Fe 2 O 3 /CNT composites have shown better response in comparison to the sensor based on bare CNTs when exposed to NH 3 gas. 21 In order to improve the sensor's response, few scientific workers have also explored this area of research in terms of their operational temperature. 22 23 According to the literature survey we have found only few research papers on CNTs based composite sensors for CO or other gas molecules.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide-Multi Walled Carbon Nanotubes Nanocomposites for Carbon Monoxide Gas Sensor Application

Alharbi¹,

Ansari²,

Salah³

et al. 2016

j nanosci nanotechnol

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Zinc oxide (ZnO)/multi walled carbon nanotubes (MWCNTs) composites based sensors with different ZnO concentrations were fabricated to improve carbon monoxide (CO) gas sensing properties in comparison to the sensors based on bare MWCNTs. To study the structure, morphology and elemental composition of the resultant products, X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM) and Energy dispersive X-ray spectroscopy (EDS) were carried out. It has been observed that as the concentration of ZnO is increased more and more ZnO nanoparticles in the form of nodes get attached to MWCNTs resulting the reduction in average diameter of MWCNTs. The typical response of ZnO/MWCNTs composites based gas sensors for different CO concentrations (40, 100, 140 and 200 ppm) was studied by using very advanced sensing setup attached to I-V measurement system. Different sensing parameters such as: resistive response, sensitivity and response time were estimated at room temperature for all the fabricated sensors. The results indicated that the sensor based on nanocomposite which has 30 mg ZnO dispersed on 20 mg MWCNTs showing highest sensitivity and fastest response. All the sensors showed response times ranging from 8 to 23 seconds. The sensing mechanism behind the sensors based on ZnO/MWCNTs nanocomposites for CO gas at room temperature is also discussed in the present report.

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Fe₂O₃/Carbon Nanotube-Based Resistive Sensors for the Selective Ammonia Gas Sensing

Cited by 21 publications

References 0 publications

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

General fabrication and enhanced VOC gas-sensing properties of hierarchically porous metal oxides

Zinc Oxide-Multi Walled Carbon Nanotubes Nanocomposites for Carbon Monoxide Gas Sensor Application

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Fe2O3/Carbon Nanotube-Based Resistive Sensors for the Selective Ammonia Gas Sensing

Cited by 21 publications

References 0 publications

Fast-LPG Sensors at Room Temperature by α-Fe2O3/CNT Nanocomposite Thin Films

Fast-LPG Sensors at Room Temperature by α-Fe2O3/CNT Nanocomposite Thin Films

General fabrication and enhanced VOC gas-sensing properties of hierarchically porous metal oxides

Zinc Oxide-Multi Walled Carbon Nanotubes Nanocomposites for Carbon Monoxide Gas Sensor Application

Contact Info

Product

Resources

About

Fe₂O₃/Carbon Nanotube-Based Resistive Sensors for the Selective Ammonia Gas Sensing

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films