High Speed Roll-to-Roll Printable Transistor Enabled by a Pulsed Light Curable CNT Ink

Abstract

This paper reports the first high speed roll-to-roll printable transistor using a carbon nanotube (CNT) semiconducting layer. The transistor is made possible through the development of a pulsed light curable CNT ink compatible with typical drop on demand inkjet cartridges. This CNT ink uses a xylene based solvent with methanol, glycerin, and Triton X-100 modifiers to create an evaporable solution with appropriate absorption spectra for a mercury or xenon flash lamp with strong energy transmission in the UVB to mid visible light range, allowing the solution to absorb the energy from the flash lamp and evaporate. Transistor dimensions were defined by the capabilities of a typical roll-to-roll drop on demand cartridge. The final device demonstrated an on/off ratio of 104, representing performance similar to gravure printed devices. This represents the first CNT ink which can be used in high speed production methods without long thermal curing steps in the workflow.

Device Optimization and Large‐Scale Roll‐to‐Roll Manufacturability of Flexible Thin‐Film Thermoelectric Generators

“…Various powers were trialed in the Laser Cutter to find an optimum condition, which removed only the Bi-Te coating without visible damage to the PET substrate. For these experiments, the nano-size Ag ink printing we used required a ~10-min post-annealing in an oven at ~120°C, which was not compatible with R2R processes because of softening PET (glass transition temperature: 67 -81°C), while there was reported UV curable Ag ink [53] that could be compatible with R2R processes. The cross-section of the as-deposited sample was polished using a Gatan PECS II system, and then imaged using FE-SEM Zeiss Merlin and analyzed using elemental point/mapping with energy dispersive X-ray analysis (EDX) under a working distance of 5 mm, a voltage of 3 kV, and a probe of 100 pA. chosen points on the film and following a correlation using the method in [54] ).…”

“…Various powers were trialed in the Laser Cutter to find an optimum condition, which removed only the Bi-Te coating without visible damage to the PET substrate. For these experiments, the nanosized Ag ink printing we used required a %10 min post-annealing in an oven at %120 C, which was not compatible with R2R processes because of softening PET (glass transition temperature: 67-81 C), whereas UV-curable Ag ink was reported [49] to be compatible with R2R processes.…”

Additive Manufacturing: An Opportunity for the Fabrication of Near-Net-Shape NiTi Implants

“…Binder jetting • ProJet color-jet printing [24][25][26] A liquid agent is selectively dropped on top of powder media, requiring subsequent heating or infiltration.…”

Fast, accurate, point-of-care COVID-19 pandemic diagnosis enabled through advanced lab-on-chip optical biosensors: Opportunities and challenges

“…Graphene has been regarded a revolutionary material ever-since its first introduction in 2004 146 , given its extraordinary optical and electronic properties 32,[147][148][149][150][151][152][153][154][155][156][157][158][159][160][161] . Since then, graphene has also shown an immense potential in different applications and a great deal of graphene based biomolecular sensors have been specifically developed by paying especial attention to its biocompatibility and high specific surface area 45,[162][163][164] .…”

“…Moreover, graphene also helps to adsorb biomolecules better, because of π-π stacking, which increases the system's affinity for these molecules (Fig 19) Table 3. The difference between a graphene-based electrical and optical sensor [adapted 32,155,156 ].…”