Researchers have created printed circuits at room temperature using various semi-conducting polymers as the carrier transport medium. A printable high-speed thin-film transistor (TFT) has been fabricated on a regular plastic transparency film. The carrier transport layer of the TFT is an ultra pure carbon nanotube (CNT) having thin film of high density (greater than 1000 CNTs per mum2) formed at room temperature by dispensing a tiny droplet of an electronic-grade CNT solution, which does not contain any surfactant. This CNT-TFT exhibits a high-modulation speed and a large current-carrying capacity. A unique ink-jet printing compatible process enables mass production of large-area electronic circuits on any virtually desired flexible substrate at low cost and high throughput.

Brewer Science, Inc. has developed an electronic-grade carbon-nanotube solution which can be deposited as a tiny droplet of the solution onto a plastic transparency film at room temperature using a syringe, a method similar to ink-jet printing. This is an electronic-grade solutions containing ultrapure carbon nanotubes without using any surfactant and the printed transistor's carrier mobility is much higher and can carry a large current than similar devices.