Recent advances in hybrids of carbon nanotube network films and nanomaterials for their potential applications as transparent conducting films

Yang, Seung Bo; Kong, Byung Seon; Jung, Dae Hwan; Baek, Youn Kyoung; Han, Chang Soo; Oh, Sang Keun; Jung, Hee Tae

doi:10.1039/c0nr00855a

Cited by 84 publications

(52 citation statements)

References 135 publications

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“…Individual single-walled carbon nanotubes (SWNTs) have desirable electrical, optical, thermal, and mechanical properties that suggest they are ideal elements for flexible transparent conducting networks with indium-doped tin oxide (ITO)-matching electrical and optical performance [1][2][3]. An ideal SWNT network will have individual metallic SWNTs as the electrically conducting element, have zero inter-tube contact resistance, and be relatively ordered to minimise adverse electrical transport effects.…”

Section: Introductionmentioning

confidence: 99%

“…Many attempts have been made to optimise the room temperature conductance of nanotube networks by the chemical doping and hybridization with a host network of guest components by various methods, including acid treatment [11,12], decoration by metal nanoparticles [3,13], production of conducting polymer composite films [14] and graphene-SWNT networks [15].…”

Section: Introductionmentioning

confidence: 99%

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High electrical conductance enhancement in Au-nanoparticle decorated sparse single-wall carbon nanotube networks

McAndrew

Baxendale

2013

Nanotechnology

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We report high electrical conductivity enhancement in sparse single-walled carbon nanotube networks by decoration with Au nanoparticles. The optimised hybrid network exhibited a sheet resistance of 650 /sq: 1/1500 of the resistance of the host undecorated network, with a negligible optical transmission penalty (>90% transmittance at 550 nm wavelength). The electrical transport at room temperature in host and decorated networks was dominated by 2-dimensional variable range hopping.The high conductance enhancement was due to positive charge transfer from the decorating Au nanoparticles in intimate contact with the host network causing a Fermi energy shift into the high density of states at a van Hove singularity and enhanced electron delocalisation relative to the host network which beneficially modifies the hopping parameters in such a way that the network behaves as an integral whole. The effect is most pronounced when the nanoparticle diameter is comparable to the electron mean free path in the bulk material at room temperature and there is minimum nanoparticle agglomeration. For higher than optimal values of nanoparticles per unit area or nanoparticle diameter, the conductivity enhancement is countered by metallic inclusions in the current pathways that are of higher resistance than the VRH-controlled elements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High electrical conductance enhancement in Au-nanoparticle decorated sparse single-wall carbon nanotube networks

McAndrew

Baxendale

2013

Nanotechnology

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“…[16][17][18] A few different methods to reduce the resistivity of CNT thin films have been reported recently. 19 Treating the nanotube a) Electronic mail: tomi.ketolainen@aalto.fi network with acids enhances the conductivity by lowering the resistance of CNT junctions. 20 The effect of the acid treatment on the conductivity of a CNT thin film has been found to be stronger when the nanotubes form a honeycomb-like network rather than being randomly oriented.…”

Section: Introductionmentioning

confidence: 99%

Enhancing conductivity of metallic carbon nanotube networks by transition metal adsorption

Ketolainen

Havu

Puska

2015

The Journal of Chemical Physics

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The conductivity of carbon nanotube thin films is mainly determined by carbon nanotube junctions, the resistance of which can be reduced by several different methods. We investigate electronic transport through carbon nanotube junctions in a four-terminal configuration, where two metallic single-wall carbon nanotubes are linked by a group 6 transition metal atom. The transport calculations are based on the Green’s function method combined with the density-functional theory. The transition metal atom is found to enhance the transport through the junction near the Fermi level. However, the size of the nanotube affects the improvement in the conductivity. The enhancement is related to the hybridization of chromium and carbon atom orbitals, which is clearly reflected in the character of eigenstates near the Fermi level. The effects of chromium atoms and precursor molecules remaining adsorbed on the nanotubes outside the junctions are also examined.

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“…[1][2][3] Individualised, bundled and networks of SWCNTs have been used as an alternative functional material in wide variety of electronic devices including field effect transistors (FETs), [4][5][6][7] transparent conducting films (TCFs), [8][9][10][11][12][13][14] and chemical sensors. [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.…”

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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Recent advances in hybrids of carbon nanotube network films and nanomaterials for their potential applications as transparent conducting films

Cited by 84 publications

References 135 publications

High electrical conductance enhancement in Au-nanoparticle decorated sparse single-wall carbon nanotube networks

High electrical conductance enhancement in Au-nanoparticle decorated sparse single-wall carbon nanotube networks

Enhancing conductivity of metallic carbon nanotube networks by transition metal adsorption

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

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