6:00 PM - 6:15 PM
▲ [14p-311-18] Single Molecular Electrical Property of Perpendicularly Connected Porphyrin-imide Molecule Anchored by Thiol Group and Porphyrin Ring
Keywords:molecular electronics, porphyrin, rectifier
To achieve single molecular rectifier with good rectifying performance, perpendicularly connected porphyrin-imide molecule was proposed which has spatially close but separated highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). In previous research, it has been confirmed that such molecule possesses high single molecular rectification performance. However, the rectifying direction kept unknown because it was unable to control the orientation of molecule during break junction measurement due to the symmetrical anchoring groups.
To research the rectifying direction of perpendicularly connected porphyrin-imide, we synthesized the molecule with thiol group on imide side as anchoring group, and use the porphyrin ring as another anchoring group. These two asymmetrical anchoring groups allow us to control the orientation of porphyrin-imide molecule during scanning tunnel microscope break junction (STM-BJ) measurement. After being coated on a gold STM substrate with controlled porphyrin-imide-thiol-gold orientation by taking the advantage of strong interaction between thiol group and gold, STM-BJ measurement was conducted using porphyrin ring as another anchoring group. STM-BJ result shows successful formation of molecular junction. The rectifying direction will be decided in further measurements and rectifying mechanism will be discussed.
To research the rectifying direction of perpendicularly connected porphyrin-imide, we synthesized the molecule with thiol group on imide side as anchoring group, and use the porphyrin ring as another anchoring group. These two asymmetrical anchoring groups allow us to control the orientation of porphyrin-imide molecule during scanning tunnel microscope break junction (STM-BJ) measurement. After being coated on a gold STM substrate with controlled porphyrin-imide-thiol-gold orientation by taking the advantage of strong interaction between thiol group and gold, STM-BJ measurement was conducted using porphyrin ring as another anchoring group. STM-BJ result shows successful formation of molecular junction. The rectifying direction will be decided in further measurements and rectifying mechanism will be discussed.