Thin films of carbon nanotubes via ultrasonic spraying of suspensions in <i>N</i>-methyl-2-pyrrolidone and <i>N</i>-cyclohexyl-2-pyrrolidone

Willey, Anthony; Holt, Josh; Larsen, B.; Blackburn, Jeffrey L.; Liddiard, S.; Abbott, Jonathan; Coffin, Mallorie; Vanfleet, Richard; Davis, Robert C.

doi:10.1116/1.4861370

Cited by 13 publications

(6 citation statements)

References 19 publications

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“…This effect is most notably observed when suspended CNTs flocculate and separate from the solvent within minutes to hours of mixing. With continuous efforts on this topic, − there are three main strategies to disperse a CNT in a liquid medium, including (1) dispersing a pristine CNT in neat solvents, (2) utilizing dispersing agents, and (3) modification of CNTs by covalent surface functionalization. − …”

Section: Preparation Of Transparent Cnt Filmsmentioning

confidence: 99%

Recent Development of Carbon Nanotube Transparent Conductive Films

2016

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Transparent conducting films (TCFs) are a critical component in many personal electronic devices. Transparent and conductive doped metal oxides are widely used in industry due to their excellent optoelectronic properties as well as the mature understanding of their production and handling. However, they are not compatible with future flexible electronics developments where large-scale production will likely involve roll-to-roll manufacturing. Recent studies have shown that carbon nanotubes provide unique chemical, physical, and optoelectronic properties, making them an important alternative to doped metal oxides. This Review provides a comprehensive analysis of carbon nanotube transparent conductive films covering detailed fabrication methods including patterning of the films, chemical doping effects, and hybridization with other materials. There is a focus on optoelectronic properties of the films and potential in applications such as photovoltaics, touch panels, liquid crystal displays, and organic light-emitting diodes in conjunction with a critical analysis of both the merits and shortcomings of carbon nanotube transparent conductive films.

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Section: Preparation Of Transparent Cnt Filmsmentioning

confidence: 99%

Recent Development of Carbon Nanotube Transparent Conductive Films

2016

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“…Driving nanotube alignment has been difficult, by itself, but concurrently realizing control over packing density, nanotube individualization, uniformity, and large‐area scaling has been especially challenging. Most conventional approaches for depositing nanotubes onto substrates (e.g., spin, blade, and drop casting; spraying; and vacuum filtration) yield films of nanotubes that are randomly oriented. Strategies for aligning nanotubes have been pursued; however, many of these approaches have been developed without thin film transistors in mind.…”

Section: Introductionmentioning

confidence: 99%

Substrate‐Wide Confined Shear Alignment of Carbon Nanotubes for Thin Film Transistors

Jinkins

Chan

Jacobberger

et al. 2018

Adv Elect Materials

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of highly aligned, individualized, electronics-grade semiconducting nanotubes are needed. These nanotubes must be uniformly deposited over large-area substrates at an intermediate linear packing density of 50-200 nanotubes µm −1 . [6,7] Alignment is important, as it decreases the number of resistive nanotube-nanotube junctions in the charge percolation pathway, thereby enabling high transistor drive current and mobility. [8,9] Moreover, nanotube individualization and control over packing density are important because the bundling and the formation of multilayers of tubes at high packing densities can result in transistors with low on/off conductance modulation ratio due to electrostatic screening. [10,11] Bundles and multilayers can also decrease on-current due to difficulties in forming low-resistance electrical contacts to tightly spaced nanotubes. [12] On the other hand, if the density of nanotubes is too low, then there are an insufficient number of charge conducting pathways, resulting in poor on-current and mobility. Individualization is also imperative in applications such as sensors, in which the nanotube surface area must be maximized to increase the number of accessible sites for analyte binding. [13] Driving nanotube alignment has been difficult, by itself, but concurrently realizing control over packing density, nanotube individualization, uniformity, and large-area scaling has been especially challenging. Most conventional approaches for depositing nanotubes onto substrates (e.g., spin, [14] blade, [15] and drop casting [16] ; spraying [17,18] ; and vacuum filtration [19,20] ) yield films of nanotubes that are randomly oriented. Strategies for aligning nanotubes have been pursued; however, many of these approaches have been developed without thin film transistors in mind. For example, the alignment of multiwalled carbon nanotubes has been demonstrated extensively; yet, multiwalled carbon nanotubes are semimetallic and thus are not suitable for transistors. [21,22] Furthermore, techniques for aligning multiwalled carbon nanotubes are generally difficult to translate to aligning single-walled carbon nanotubes, which are considerably smaller than multiwalled nanotubes. The alignment of nanotubes in polymer matrices has also received substantial attention, but this technique yields bulk composites rather than single layers of tubes on surfaces. [23][24][25] Likewise, recent work To exploit their charge transport properties in transistors, semiconducting carbon nanotubes must be assembled into aligned arrays comprised of individualized nanotubes at optimal packing densities. However, achieving this control on the wafer-scale is challenging. Here, solution-based shear in substrate-wide, confined channels is investigated to deposit continuous films of well-aligned, individualized, semiconducting nanotubes. Polymerwrapped nanotubes in organic ink are forced through sub-mm tall channels, generating shear up to 10 000 s −1 uniformly aligning nanotubes across substrates. The ink volume and concentration, channe...

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Section: Ultrasonic Spray Depositionmentioning

confidence: 99%

“…Even though multiple ultrasonic-based spray techniques have been demonstrated for the fabrication of OPVs, [182,183] only recently has the methodb een used for OFET fabrication.T his process wasf irst discussed by Abdellah et al [184] and later developedb yS hao et al [185] They fabricated ITOb ottom-gate, Au top-contact OFETsb yu sing ultrasonic-based spray deposition of TIPS Pn and PVP as the active semiconductor and insulator, respectively.Am aximum charge-carrier mobility of 0.35 cm 2 V À1 s À1 ,t hreshold voltage of 11.3 V, and on/off current ratio of more than 10 4 on af lexible substrate was observed from tilting as ubstrate at as mall angle of 38 to align the TIPS Pn crystals. This performance is comparable to devices fabricated by using traditional spin-coating processes, with the added ability for large-area fabrication.T he PVP film exhibits low roughnessd ue to the nature of the smalld roplet size produced by the ultrasonic waves.…”

Section: Ultrasonic Spray Depositionmentioning

confidence: 99%

Versatile Organic Transistors by Solution Processing

2015

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A selection of the latest developments in organic electronic materials and organic field-effect transistor (OFET) devices is reviewed here with an emphasis on the synthetic and manufacturing versatility, ease of processing, and low cost offered by solution processability. At the heart of these benefits is the nature of the weak van der Waals intermolecular interactions inherent to organic compounds. This allows processability with a relatively small amount of energy investment. Material solubility, in particular, creates unique pathways for film fabrication and the design of new device architectures, while presenting new manufacturing challenges to explore. In this review we provide a chronological presentation of the important developments in the solution-deposited organic small-molecule semiconductor, dielectric, and electrode materials used in OFETs, making specific note of current benchmarks. Organic device architectures and fabrication methods that are characterized by reduced complexity and ease of implementation are discussed.

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Thin films of carbon nanotubes via ultrasonic spraying of suspensions in N-methyl-2-pyrrolidone and N-cyclohexyl-2-pyrrolidone

Cited by 13 publications

References 19 publications

Recent Development of Carbon Nanotube Transparent Conductive Films

Recent Development of Carbon Nanotube Transparent Conductive Films

Substrate‐Wide Confined Shear Alignment of Carbon Nanotubes for Thin Film Transistors

Versatile Organic Transistors by Solution Processing

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