Covalently bonded single-molecule junctions with stable and reversible photoswitched conductivity
A collaboration between Chinese and American researchers has developed a switch made from a single photosensitive molecule, according to a report published in the journal Science.
Led by scientists from East China University of Science and Technology, the team made an electrical switch from a single diarylethene molecule — an organic compound bonded to each end of a carbon-carbon double bond — sandwiched between graphene electrodes.
Previously, the interactions between the diarylethene and electrodes had caused photoswitches to become stuck in either an open or closed position. To prevent this, the researchers used three methylene groups, a carbon atom bound to two hydrogen atoms, as a bridge between the diarylethene and the electrodes.
Turned ‘on’ by exposure to visible light, and turned ‘off’ by exposing it to ultraviolet light, the photoswitch paves the way for smaller, much faster computers that use light instead of electricity to transmit information.
- Science 352,1443-1445 (2016). doi: 10.1126/science.aaf6298