Synthesis and gas sensing characteristic based on metal oxide modification multi wall carbon nanotube composites

Li, Hongzhong; Ma, Hui; Wei-Man, Zhou; Liu, Weihua; Zheng, Jianlong; Li, Xin

doi:10.1016/j.apsusc.2011.05.081

Cited by 31 publications

(11 citation statements)

References 11 publications

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“…Only small amount of semiconducting CNTs formed among predominant conducting CNTs during growing process [10–13]. When the NH 3 gas adsorbed on the sidewalls, edges or tube ends, the electrical conductivity of the MWCNTs is changed [14,15]. The sensing mechanism of CNT-based gas sensors involves charge transfer, which occurs during the interaction of gas molecules with the CNT surface.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

Nguyen

Phan

Duong

et al. 2013

Sensors

112

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Multi-walled carbon nanotube (MWCNT) film has been fabricated onto Pt-patterned alumina substrates using the chemical vapor deposition method for NH3 gas sensing applications. The MWCNT-based sensor is sensitive to NH3 gas at room temperature. Nanoclusters of Co catalysts have been sputtered on the surface of the MWCNT film to enhance gas sensitivity with respect to unfunctionalized CNT films. The gas sensitivity of Co-functionalized MWCNT-based gas sensors is thus significantly improved. The sensor exhibits good repeatability and high selectivity towards NH3, compared with alcohol and LPG.

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Section: Resultsmentioning

confidence: 99%

Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

Nguyen

Phan

Duong

et al. 2013

Sensors

112

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“…LPG, NO 2 , SO 2 , and CO which have a detrimental effect on the human health and environment. Among them SnO 2 is one of the most studied n-type large band gap (3.6 eV) semiconductor [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Nanosized semiconducting oxide ceramics such as ZnO, TiO 2 , Fe 2 O 3 , WO 3 and SnO 2 are extensively used in the field of gas sensors for detection of toxic and explosive gases i.e. LPG, NO 2 , SO 2 , and CO which have a detrimental effect on the human health and environment.…”

Section: Introductionmentioning

confidence: 99%

LPG sensing characteristics of electrospray deposited SnO2 nanoparticles

Gürbüz¹,

Günkaya²,

Doğan³

2014

Applied Surface Science

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“…Deposition of TiO 2 nanoparticles/film onto CNT walls was also studied [24][25][26]. However, good conformality and homogeneity as well as a precise control of the thickness/particle size remain still challenging.…”

mentioning

confidence: 99%

“…Even though crystalline titanium oxide phases are mostly studied, few papers demonstrated good sensing properties of amorphous TiO 2 nanotubes towards oxygen at low/moderate temperature [18]. TiO 2 /CNT hybrid composites have been already investigated as gas sensors [19][20][21][22][23][24][25][26]. Early attempts focused on dispersion of CNTs into titania films [19,21,22].…”

mentioning

confidence: 99%

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

et al. 2014

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Abstract:Amorphous titanium dioxide-coated carbon nanotubes were prepared by atomic layer deposition and investigated as sensing layers for resistive NO2 and O2 gas sensors. By varying ALD process conditions and CNT structure, heterostructures with different metal oxide grain size, morphology and coating thickness were synthesized. Higher responses were observed with homogeneous and continuous 5.5 nm thick films onto CNTs at an operating temperature of 150 °C, while CNTs decorated with either discontinuous film or TiO2 nanoparticles showed a weak response close to the one of device made of bare CNTs. An unexpected p-type behavior in presence of the target gas was also noticed, independently of the metal oxide morphology and thickness. Based on previous works, hypotheses were made in order to explain the p-type behavior of TiO2/CNT sensors. CONFIDENTIAL -FOR REVIEW ONLY NANO-104240.R2Gas sensing properties and p-type response of ALD TiO 2 coated carbon nanotubes Email: catherine.marichy@univ-lyon1.fr AbstractAmorphous titanium dioxide-coated carbon nanotubes were prepared by atomic layer deposition and investigated as sensing layers for resistive NO 2 and O 2 gas sensors. By varying ALD process conditions and CNT structure, heterostructures with different metal oxide grain size, morphology and coating thickness were synthesized. Higher responses were observed with homogeneous and continuous 5.5 nm thick films onto CNTs at an operating temperature of 150 °C, while CNTs decorated with either discontinuous film or TiO 2 nanoparticles showed a weak response close to the one of device made of bare CNTs. An unexpected p-type behavior in presence of the target gas was also noticed, independently of the metal oxide morphology and thickness. Based on previous works, hypotheses were made in order to explain the p-type behavior of TiO 2 /CNT sensors.

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Synthesis and gas sensing characteristic based on metal oxide modification multi wall carbon nanotube composites

Cited by 31 publications

References 11 publications

Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

LPG sensing characteristics of electrospray deposited SnO2 nanoparticles

Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes

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Synthesis and gas sensing characteristic based on metal oxide modification multi wall carbon nanotube composites

Cited by 31 publications

References 11 publications

Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

Enhancement of NH3 Gas Sensitivity at Room Temperature by Carbon Nanotube-Based Sensor Coated with Co Nanoparticles

LPG sensing characteristics of electrospray deposited SnO2 nanoparticles

Gas sensing properties and p-type response of ALD TiO2coated carbon nanotubes

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Gas sensing properties and p-type response of ALD TiO₂coated carbon nanotubes