First surfactant-free semiconducting carbon nanotube inks Brewer Science today launched inks with the potential to change the way carbon nanotube (CNT) users manufacture microelectronic devices. The company introduced the first aqueous, surfactant-free, ready-to-use semiconducting CNT inks for microelectronics and printed electronics applications. Brewer Science, a leading supplier of specialty materials and integrated solutions for microelectronics device fabrication, is once again delivering a game-changing product that will provide its customers with an advantage in their industry. “Until now, users of semiconducting CNTs had to use surfactant-containing ink from material suppliers or produce surfactant-based inks themselves from raw semiconductor CNT sources. In either case, the deposited surfactant had to be washed from the film, which generated CNT-contaminated waste and could redistribute the deposited films, leading to performance variation,” said Jim Lamb, Director of Business Development, Carbon Electronics Center. “This point-of-use tinkering was very process intensive and inconsistent, even for laboratory usage of CNTs, and commercial applications could not be targeted with such products. These ready-to-use formulations will give our customers a stable and consistent product for use in large-scale manufacturing of semiconducting devices and many other products.” The CNTRENE 4010 series of semiconducting inks are stable, water-based materials prepared using a proprietary method developed by Brewer Science. Due to their unique formulation, the inks do not contain additives such as surfactants that require damaging and waste-producing post-deposition treatment (wash) steps. These inks can be deposited easily onto a variety of rigid and flexible substrates with standard coating techniques including spray-coating and Aerosol Jet® printing. At Brewer Science’s Carbon Electronics Center, arrays of TFT devices have been prepared which have average ON/OFF ratios of >4000 and mobilities of >0.2 cm2/V·s.