Thickness dependent sensing mechanism in sorted semi-conducting single walled nanotube based sensors

Battie, Yann; Gorintin, Louis; Ducloux, O.; Thobois, Philippe; Bondavalli, Paolo; Feugnet, Gilles; Loiseau, Annick

doi:10.1039/c2an15949j

Cited by 27 publications

(29 citation statements)

References 47 publications

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“…In low-density networks of non-sorted SWCNTs below the m-SWCNT perocolation threshold, conductance is increasingly dominated by Schottky barrier modulation at the interface between sc-SWCNT and the electrodes or m-SWCNTs, while thick networks have complete metallic conduction paths with the resistance of the film dominated by nanotube-nanotube junctions. 55 Accordingly, the effect of residual surfactant and water vapour was found to differ in thin (and thus lower density) networks.…”

Section: Resultsmentioning

confidence: 99%

“…The thickness and density of randomly orientated SWCNT films is important when considering gas sensing mechanisms 52,53 and charge transport in the network. 54 Previous work by Battie et al 55 has shown that SWCNT sensing behaviour changes with a reduction in the number of m-SWCNTs in the film. Randeniya et al 56 found that thinner networks of SWCNTs are more influenced by the substrate.…”

Section: Resultsmentioning

confidence: 99%

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Switchable changes in the conductance of single-walled carbon nanotube networks on exposure to water vapour

et al. 2017

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We have discovered that wrapping single-walled carbon nanotubes (SWCNTs) with ionic surfactants induces a switch in the conductance-humidity behaviour of SWCNT networks. Residual cationic vs.anionic surfactant induces a respective increase or decrease in the measured conductance across the SWCNT networks when exposed to water vapour. The magnitude of this effect was found to be dependent on the thickness of the deposited SWCNT films. Previously, chemical sensors, field effect transistors (FETs) and transparent conductive films (TCFs) have been fabricated from aqueous dispersions of surfactant functionalised SWCNTs. The results reported here confirm that the electrical properties of such components, based on randomly orientated SWCNT networks, can be significantly altered by the presence of surfactant in the SWCNT layer. A mechanism for the observed behaviour is proposed based on electrical measurements, Raman and UV-Vis-NIR spectroscopy. Additionally, the potential for manipulating the sensitivity of the surfactant functionalised SWCNTs to water vapour for atmospheric humidity sensing was evaluated. The study also presents a simple method to establish the effectiveness of surfactant removal techniques, and highlights the importance of characterising the electrical properties of SWCNT-based devices in both dry and humid operating environments for practical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Switchable changes in the conductance of single-walled carbon nanotube networks on exposure to water vapour

et al. 2017

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“…SWCNTs are considered as promising candidates for future optical and electronic devices such as field effect transistor, 1 gas sensors, 2,3 optical bolometer, 4 laser source, 5 and saturable absorber. 6 However, as shown previously, 3 the performances of these devices can be drastically affected by the chirality distribution.…”

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confidence: 94%

“…SWCNTs are sorted using non-linear DGU process as described by Gosh et al 13 Sorted SWCNT and raw SWCNTs are spread on cleaned glass substrates by filtration process. 2,3 Both films are composed of randomly orientated SWCNTs network and have a good optical quality. Their thickness, estimated from mechanical profilometry, is around 300 nm.…”

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confidence: 99%

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Chirality distribution in single walled carbon nanotube films by spectroscopic ellipsometry

et al. 2013

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International audienceWe report an experimental technique that determines the chirality distribution in single wall carbonnanotube (SWCNT) films. Films of CoMoCat SWCNTs and SWCNTs enriched in (6,5) chiralityare considered. Classical methods like photoluminescence spectroscopy frequently give incompletedistribution. In this way, spectroscopic ellipsometry is used to determine the dielectric function ofSWCNT film. The chirality abundance obtained by analysing the ellipsometric data with a tightbinding model is compared with that deduced from photoluminescence excitation spectroscopy.We demonstrate that ellipsometry is an efficient tool for a complete and quantitative determinationof the chirality distribution and the metallic/semiconducting ratio

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Highly Efficient Response of Ammonia Gas Sensor Based on Surfactant‐Free Sorted‐Semiconducting Single‐Walled Carbon Nanotubes at Room Temperature

Abbas

Yoo

et al. 2022

Physica Status Solidi (a)

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A comparative analysis of sorted semiconducting (sc‐) single‐walled carbon nanotubes (SWCNTs) films, metallic (m‐) SWCNTs films, pristine SWCNTs films, and graphene‐based simple two‐terminal sensors for the applications of ammonia gas sensing is presented. The comparison of the sensing response of different devices by separately measuring the SWCNTs film resistance and the contact resistance between SWCNTs and the electrodes reveals that the performance mainly relies on the modification of tube conductivity under exposure to gas. Moreover, the measurements show that the highest sensitivity of the devices is achieved by use of sc‐SWCNTs as the conducting channels. Sensor coated with surfactant‐free sc‐SWCNTs shows a sensitivity of 0.78% ppm at 5–100 ppm ammonia (NH3) concentrations that happened to be ≈28, ≈22, and ≈173 times more sensitive than pristine‐SWCNTs, m‐SWCNTs, and graphene‐based sensors, respectively, at 50 ppm and ≈4.5 times the previously reported sc‐SWCNTs‐based sensor at 5 ppm. Notably, all the experiments values are achieved at room temperature without any extra heating treatment for the recovery process. These results show that surfactant‐free sc‐SWCNTs provide a promising way of creating sensors with improved selectivity and sensitivity, which predicts the auspicious prospects in the development of future applications.

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Thickness dependent sensing mechanism in sorted semi-conducting single walled nanotube based sensors

Cited by 27 publications

References 47 publications

Switchable changes in the conductance of single-walled carbon nanotube networks on exposure to water vapour

Switchable changes in the conductance of single-walled carbon nanotube networks on exposure to water vapour

Chirality distribution in single walled carbon nanotube films by spectroscopic ellipsometry

Highly Efficient Response of Ammonia Gas Sensor Based on Surfactant‐Free Sorted‐Semiconducting Single‐Walled Carbon Nanotubes at Room Temperature

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