Interaction of methane with carbon nanotube thin films: role of defects and oxygen adsorption

Valentini, Luca; Armentano, Ilaria; Lozzi, L.; Santucci, S.; Kenny, J. M.

doi:10.1016/j.msec.2004.01.003

Cited by 46 publications

(21 citation statements)

References 38 publications

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“…7 shows TGA-MS results achieved under air and argon for a SWNT sample. While, as expected, the only massive production of carbon monoxide and mostly carbon dioxide is observed under air conditions, under argon the detected species evidently indicate the presence of different contaminants and surface defects that are present on the tubular structures [68]. In fact, small quantities of ammonia and short hydrocarbon chains (one, two and three carbon atoms long: C 1-3 ) are actually generated throughout the whole process, while during the main degradation step relevant traces of carbon monoxide, water and a lesser amount of carbon dioxide have been systematically detected.…”

Section: Thermogravimetrical Analysissupporting

confidence: 73%

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Comprehensive spectral and instrumental approaches for the easy monitoring of features and purity of different carbon nanostructures for nanocomposite applications

Boccaleri

Arrais

Frache

et al. 2006

Materials Science and Engineering: B

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Section: Thermogravimetrical Analysissupporting

confidence: 73%

“…In general, under oxidative conditions, tubular structures are substantially less stable than graphite and most disordered carbons. This behavior well mirrors the widely variable extended defectivity of a coiled graphenic CNT structure [68]. The stability of CNTs towards molecular fullerenes is found to be often comparable.…”

Section: Thermogravimetrical Analysissupporting

confidence: 69%

Comprehensive spectral and instrumental approaches for the easy monitoring of features and purity of different carbon nanostructures for nanocomposite applications

Boccaleri

Arrais

Frache

et al. 2006

Materials Science and Engineering: B

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“…Upto-date, only a few reports are available on the room temperature oxygen sensing performance with TiO 2 , CNTs and TiO 2 grafted Graphene nanostructures, but constrained by complicated device structures along with slow response and high recovery time. 11,12,13 In the present study, the room temperature reversible oxygen sensing performance of …”

Section: Introductionmentioning

confidence: 88%

Multiwalled Carbon Nanotube Oxygen Sensor: Enhanced Oxygen Sensitivity at Room Temperature and Mechanism of Sensing

Rajavel

Lalitha

Radhakrishnan

et al. 2015

ACS Appl. Mater. Interfaces

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A pyrolysis assisted method was applied for the synthesis of defect controlled carbon nanotubes (CNTs) by varying different growth temperatures. The fabricated resistive devices containing a random network of CNTs were tested for oxygen sensing under standard room-temperature and pressure conditions. Nanotubes grown at moderate growth temperatures (870 °C), when exposed to different concentrations of oxygen, displayed a higher sensitivity (3.6%), with fast response and recovery times of about 60 and 180 s, respectively, compared to nanotubes grown at higher and lower temperatures. A room-temperature oxygen detection concentration as low as 0.3% is achieved. The fast response and recovery of CNTs are explained in terms of physisorption of oxygen molecules at (i) carboxyl functional sites and (ii) graphitic carbon sites (pristine CNT) rather than chemisorption at (iii) defected sites. Interestingly, the density functional theory simulated interaction energies (Eads) of oxygen molecules with defected CNTs (-3.381 eV) and pristine CNTs (-0.753 eV) are higher than that of the carboxyl functional sites (-0.551 eV) and are well correlated with the observed sensing response and recovery times of CNT sensors. Our results show that the carboxyl sites provide lower activation energy or shorter time for desorption of oxygen molecules to yield higher response and fast recovery of the CNT sensors.

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“…The device switched from p-type to n-type upon exposure and the possible role of defects adsorbed atmospheric oxygen, acting as intermediate towards other external gas molecules, was suggested [34].…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Conductometric Gas Nanosensors

2009

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This paper presents a review of the current research activities in the field of gas nanosensors. Nanomaterials are characterized by physical and chemical properties that differ from their macroscopic counterparts and, in particular, by an enhanced chemical reactivity even at room temperature. This effect has stimulated the development of chemical sensors based on several different nanomaterials. Here we focus most attention on carbon nanotubes, silicon and metal oxide nanoparticles and metal nanowires. After introducing a few general definitions a discussion on the fundamental properties of the nanostate used in the sensor field is presented and several nanosensors, based on the aforementioned nanomaterials, are discussed. Finally, some personal conclusions will be drawn.

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Interaction of methane with carbon nanotube thin films: role of defects and oxygen adsorption

Cited by 46 publications

References 38 publications

Comprehensive spectral and instrumental approaches for the easy monitoring of features and purity of different carbon nanostructures for nanocomposite applications

Comprehensive spectral and instrumental approaches for the easy monitoring of features and purity of different carbon nanostructures for nanocomposite applications

Multiwalled Carbon Nanotube Oxygen Sensor: Enhanced Oxygen Sensitivity at Room Temperature and Mechanism of Sensing

Conductometric Gas Nanosensors

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