Influence of atmospheric water vapour on electrical performance of carbon nanotube fibres

Łękawa-Raus, Agnieszka; Kurzepa, Lukasz; Kozlowski, Gregory; Hopkins, Simon C.; Woźniak, Mariusz; Łukawski, Damian; Glowacki, B.A.; Kozioł, Krzysztof

doi:10.1016/j.carbon.2015.02.018

Cited by 38 publications

(35 citation statements)

References 30 publications

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“…The permanent dipole moment of water induces a polarisation of electronic charge density in the nanotube over a long range (3 nm). Lekawa-Raus et al 71 also suggested that chemical doping does not occur in carbon nanotube fibres, with water vapour instead interacting with the nanotubes at CNT-CNT junctions. If this is the case, then it is to be expected that residual charged species in the network, such as ionic surfactants, increase the polarisation of charge upon exposure to water vapour and thus the magnitude of the conductance change observed in Fig.…”

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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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%

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

et al. 2017

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“…The adsorption of oxygen causes an increase in conductivity and strong p‐doping of CNTs. Moreover, we recently found that air humidity has an impact on the electrical conduction of CVD grown as‐made CNT fibers . The adsorbed molecular water causes an increase in the absolute conductivity of fibers.…”

Section: Properties Of Cnt Fibersmentioning

confidence: 99%

Electrical Properties of Carbon Nanotube Based Fibers and Their Future Use in Electrical Wiring

Łękawa-Raus

Patmore²,

Kurzepa

et al. 2014

Adv Funct Materials

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434

279

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The production of continuous fibers made purely of carbon nanotubes has paved the way for new macro‐scale applications which utilize the superior properties of individual carbon nanotubes. These wire‐like macroscopic assemblies of carbon nanotubes were recognized to have a potential to be used in electrical wiring. Carbon nanotube wiring may be extremely light and mechanically stronger and more efficient in transferring high frequency signals than any conventional conducting material, being cost‐effective simultaneously. However, transfer of the unique properties of individual CNTs to the macro‐scale proves to be quite challenging. This Feature Article gives an overview of the potential of using carbon nanotube fibers as next generation wiring, state of the art developments in this field, and goals to be achieved before carbon nanotubes may be transformed into competitive products.

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“…After 15 minutes of treatment, samples display a change of conductivity from 11,188 (pristine CNTF) to 5900 S m -1 . This is a consequence of the derivatization of the conjugated system, with the corresponding binding of otherwise delocalized charge, and also of a reduced contribution from surface adsorbates acting as dopants 55,22 . The values of specific capacitance at different scan rates calculated from the area of the CV curves are presented in Figure 7b.…”

Section: Resultsmentioning

confidence: 99%

Gas-Phase Functionalization of Macroscopic Carbon Nanotube Fiber Assemblies: Reaction Control, Electrochemical Properties, and Use for Flexible Supercapacitors

Iglesias

Senokos

Alemán

et al. 2018

ACS Appl. Mater. Interfaces

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The assembly of aligned carbon nanotubes (CNTs) into fibers (CNTFs) is a convenient approach to exploit and apply the unique physico-chemical properties of CNTs in many fields. CNT functionalization has been extensively used for its implementation into composites and devices. However, CNTF functionalization is still in its infancy because of the challenges associated with preservation of CNTF morphology. Here, we report a thorough study of the gas-phase functionalization of CNTF assemblies using ozone which was generated in situ from a UV source. In contrast with liquid-based oxidation methods, this gas-phase approach preserves CNTF morphology, while notably increasing its hydrophilicity. The functionalized material is thoroughly characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, and scanning electron microscopy. Its newly acquired hydrophilicity enables CNTF electrochemical characterization in aqueous media, which was not possible for the pristine material. Through comparison of electrochemical measurements in aqueous electrolytes and ionic liquids, we decouple the effects of functionalization on pseudocapacitive reactions and quantum capacitance. The functionalized CNTF assembly is successfully used as an active material and a current collector in all-solid supercapacitor flexible devices with an ionic liquid-based polymer electrolyte.

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Influence of atmospheric water vapour on electrical performance of carbon nanotube fibres

Cited by 38 publications

References 30 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

Electrical Properties of Carbon Nanotube Based Fibers and Their Future Use in Electrical Wiring

Gas-Phase Functionalization of Macroscopic Carbon Nanotube Fiber Assemblies: Reaction Control, Electrochemical Properties, and Use for Flexible Supercapacitors

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