UNCD thin films could improve the fabrication of biosensors

The development is likely to increase the material’s functionality and provide potential improvements to the fabrication of biosensors.

UNCD thin films are a special form of diamond invented at ANL and are a subject of interest because of the material’s ability to alter its electrical properties when the chemical bonding between grain boundaries is modified.

‘It’s a highly attractive carbon-based material with a range of applications in communications, medicine and defence,’ said team leader Anirudha Sumant, a materials scientist at ANL.

A primary motive behind the team’s studies, he said in a statement, is to understand the electrical transport properties of UNCD when it’s fabricated into a nanowire geometry. Similarly, they wanted to see how these properties can be altered by changing chemical bonding at the grain boundary and by taking advantage of increased surface-to-volume ratio simultaneously.

‘We’ve demonstrated a pathway to fabricate UNCD nanowires, with widths as small as 30 nanometres at a thickness of 40 nanometres, by using a top-down fabrication approach that combines electron-beam lithography and a reactive ion-etching process,’ said Sumant.