Researchers Hope Carbon Nanotube Ink Leads To Thinner, Lighter Transistors & Solar Cells

Researchers at Cornell University and DuPont have developed a method of preparing carbon nanotubes for suspension in a semiconducting "ink," which can then be printed into such thin, flexible electronics as transistors and photovoltaic materials. The method involves treating carbon nanotubes with fluorine-based molecules.

The researchers state that carbon nanotubes are good candidates for transistors in low-cost, printable electronics, but only after large quantities of them have been converted into semiconductors. When carbon nanotubes are grown in the lab, some are semiconducting but others are metallic, and they are difficult to separate from each other.

This mix is said to be a major drawback in creating transistors from nanotubes. The Cornell/DuPont team concentrated on a new, inexpensive way to eliminate the metallic tubes, preparing them for such applications as suspension in semiconducting ink for printing.

To do so, the researchers brought fluorine-based molecules into contact with the nanotubes. Through a process called cycloaddition, the fluorine molecules efficiently attacked or converted the metallic nanotubes, leaving the semiconducting tubes alone, and creating a perfect batch of solely semiconducting nanotubes.

The researchers state that their work suggests that careful control of the chemical reaction enables the complete conversion of metallic tubes without the degradation of semiconducting tubes. The work should lead to exploration of a wide range of devices, such as novel organic photovoltaic structures.

For the past several years, scientists from Cornell and DuPont have worked together on a variety of projects involving flexible electronics. The research is funded by a grant from the U.S. Air Force for developing transistors from carbon nanotubes.