Scalable Carbon Nanotube Thin Films: Fabrication, Properties and Device Applications

Hu, Liangbing; Park, Young-Bae; Hecht, David S.; Ladous, Corinne; OˇConnell, Mike; Thomas, David C.; Grüner, G.; Irvin, Glen; Drzaic, Paul

doi:10.1557/proc-1109-b10-07

Cited by 10 publications

(18 citation statements)

References 1 publication

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“…Unidym has previously shown that CNT films on plastic can be bent around a mandrel of 2-mm diameter with <20% change in R s , while an ITO films shows a 1200% increase in resistance at the same bending diameter. 6 ITO films can be made more durable by laminating the ITO/PET film to a second piece of PET using an OCA, which can help reduce film stress. However, this adds substantial additional cost to the product, which CNT coated PET can avoid.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Carbon‐nanotube film on plastic as transparent electrode for resistive touch screens

Hecht¹,

Thomas²,

Hu³

et al. 2009

J Soc Info Display

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184

120

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Abstract— Carbon‐nanotube (CNT) films on plastic are incorporated as the touch electrode in a four‐wire resistive touch panel. Single‐point actuation tests show superior mechanical performance to ITO touch electrodes, with no loss of device functionality up to 3 million actuations. Sliding‐stylus‐pen tests reveal no loss of device linearity after 1 million stylus cycles. A CNT refractive index of ∼1.55 leads to CNT touch panels with low reflection (<9% over the visible range) without costly anti‐reflective coatings. CNT films on PET currently have 86% total transmission (including the PET) over the visible and 600 Ω/□, with lab scale tests giving 88% at 500 Ω/□. CNT films are neutrally colored (a* ∼ 0, b* ∼ 1.5), low haze (<1%), uniform, and both chemically and environmentally stable. Unidym's solution‐based coatings can be printed directly onto both flexible and rigid polycarbonate using solution coating processes. Unidym films can be patterned using subtractive methods such as laser ablation with resolution down to 10 μm, or additive methods such as patterned gravure. CNTs are grown, purified, formulated into inks, and coated using scalable processes, allowing films to be attractive from a cost perspective as well.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Carbon‐nanotube film on plastic as transparent electrode for resistive touch screens

Hecht¹,

Thomas²,

Hu³

et al. 2009

J Soc Info Display

Self Cite

184

120

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show abstract

“…10 The CNT-based film is approximated as an isotropic solid with an electrical resistance R, a resistivity ρ, and a length L. The fractional change in resistance due to uniaxial tensile stress is given by the Eq. (2): (2) where ν is Poisson's ratio, l o is initial specimen length, and ∆l is the change in length due to uniaxial stressing. An effective Poisson's ratio of 0.22 is consistent with the data and with typical values reported in the literature.…”

Section: Tensile Testingmentioning

confidence: 99%

“…Over the past 5 years, thin films of carbon nanotubes (CNTs) have quickly emerged 1 as a potential transparent and conductive material to replace conventional sputtered metal oxides such as indium tin oxide (ITO) for many applications 2 . These applications include touch panels, 3 solidstate lighting, 4 photovoltaics, 5 LCDs, 6 transparent heaters, 7 and e-paper, all of which require one or more transparent conductive layers.…”

Section: Introductionmentioning

confidence: 99%

Transparent conductive carbon‐nanotube films directly coated onto flexible and rigid polycarbonate

Hecht¹,

Sierros²,

Lee³

et al. 2011

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Abstract— Carbon nanotubes have quickly emerged over the last several years as a potential candidate material to replace metal oxides in devices which require transparent and conductive electrodes. Typically, these materials are coated onto substrates such as PET and PEN for flexible electrodes and glass for rigid electrodes. Recently, there has been interest in more durable and lightweight substrates to replace glass, one such substrate being polycarbonate. Sputter coating of indium tin oxide onto polycarbonate leads to low conductivity and inconsistent results, due to out‐gassing and materials mismatch issues. In this work, it is shown that direct coating of carbon nanotubes onto polycarbonate leads to high‐performance films with facile manufacturing.

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“…Evidently, CNT-TFs are recently implemented in a wide range of applications, including transistors [2,3], optical transparent electrodes [4,5], nanoporous electrodes for energy storage [6,7], biomedical coatings [8], and field emission devices [9,10].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of multi-walled carbon nanotube thin films via electrophoretic deposition process: effect of water magnetization on deposition efficiency

et al. 2015

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In this study, the effect of water magnetization was investigated on the performance of electrophoretic deposition (EPD) of multi-walled carbon nanotubes (MWCNTs). Magnetization of water was carried out via two different methods including static and dynamic magnetization processes. It has been found that magnetization of water, as the EPD medium, could enhance several characteristics of MWCNT thin films (MWCNT-TFs). Application of magnetized water as solvent in EPD process resulted in higher electrical conductivity of EPD suspension; consequently, required deposition time was reduced and the electrolysis of water, which is known as one of the main disadvantages of water-based EPDs, was controlled to some extent. Surface morphology of MWCNT-TFs was studied via scanning electron microscopy, and notable enhancement was detected in uniformity and density of MWCNT-TF network. Significant improvement was achieved in electrical conductivity (up to 54 % increase in current) of MWCNT-TF by measuring the current versus voltage characteristics of MWCNT-TFs.

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Scalable Carbon Nanotube Thin Films: Fabrication, Properties and Device Applications

Cited by 10 publications

References 1 publication

Carbon‐nanotube film on plastic as transparent electrode for resistive touch screens

Carbon‐nanotube film on plastic as transparent electrode for resistive touch screens

Transparent conductive carbon‐nanotube films directly coated onto flexible and rigid polycarbonate

Fabrication of multi-walled carbon nanotube thin films via electrophoretic deposition process: effect of water magnetization on deposition efficiency

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