Carbon nanotube networks on different platforms

Saha, Avishek; Jiang, Chengmin; Martí, Ángel A.

doi:10.1016/j.carbon.2014.07.060

Cited by 116 publications

(70 citation statements)

References 220 publications

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“…[15][16][17][18][19][20][21][22] Networks of SWCNTs (a deposition of nanotubes containing many interconnecting bundles) display the aggregate electrical properties of the constituent SWCNTs, [23][24][25] facilitating the fabrication of devices for such applications in a more scalable and repeatable way. 26,27 Much attention has been focused on advancing methods to sort and process SWCNT samples of at least similar electronic type (i.e. metallic or semiconducting nanotube samples).…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Mukhopadhyay et al have developed an approach of attaching carpet-like arrays of carbon nanotubes (CNTs) onto porous carbon supports that results in ultra-high specific surface area (SSA) hierarchical substrates [3] suitable for supporting functional NPs. CNTs offer several advantages as NP supports and several earlier studies have discussed the influence of the physical and chemical nature of various support structures on advanced applications [4]. The CNT-enhanced substrates reported by our group have proved to be useful for several applications such as nanocomposite formation [5], surface adsorption [6], cell scaffolding [7], thermal management materials [8] in addition to support for metallic NPs [9][10][11].…”

Section: Q1mentioning

confidence: 99%

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

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The effectiveness of nanoparticle-based functional devices depends strongly on the surface morphology and area of the support. An emerging powerful approach of increasing the available surface area without decreasing strength or increasing bulk is to attach arrays of suitable nanotubes on the surface, and to attach the necessary nanoparticles to them. Earlier publications by this team have shown that carpet-like arrays of carbon nanotubes (CNT) can be successfully grown on a variety of larger carbon substrates such as graphite, foams and fabric, which offer hierarchical multiscale supporting architecture suitable for the attachment of silver nanoparticles (AgNPs). A limiting factor of pure CNT arrays in fluid-based applications is their hydrophobicity, which can reduce the percolation of an aqueous medium through individual nanotubes. Previous studies have demonstrated that the treatment of CNT carpets with dry (oxygen) plasma can induce reversible wettability, and treatment with wet (sol-gel) coating can impart permanent wettability. In this paper, we report the influence of such treatments on the attachment of AgNPs, and their effectiveness in water disinfection treatments. Both types of hydrophilic surface treatments show an increase in silver loading on the CNT carpets. Oxygenplasma treated surfaces (O-CNTs) show fine and densely packed AgNP, whereas silica-coated nanotubes (silica-CNTs) show uneven clusters of AgNPs. However, O-CNT surfaces lose their hydrophilicity during AgNP deposition, whereas silica-CNT surfaces remain hydrophilic. This difference significantly impacts the antibacterial effectiveness of these materials, as tested in simulated water containing Gram negative Escherichia coli (E. coli, JM109). AgNPs on silicacoated CNT substrates showed significantly higher reduction rates of E. coli compared to AgNPs on plasma-treated CNT substrates, despite the finer and better dispersed AgNP distribution in the latter. These results provide important insights into different aspects of surface modification approaches that can control the wettability of CNT carpets, and their applicability in water treatment applications.

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“…Carbon nanomaterials including CNTs and graphene present outstanding conductivity [29,30], strength and resilience [336][337][338]. Therefore, they are good candidates for substitutional TCF materials [23,286,[339][340][341][342]. The key issue here is the preparation of carbon nanomaterials with high transparency and low resistance.…”

Section: Carbon Nanotube and Graphene Films As Tcfs In Pv Devicesmentioning

confidence: 99%