Journal of Physical Chemistry B, Vol.103, No.20, 4006-4010, 1999
Carotene as a molecular wire: Conducting atomic force microscopy
A conducting atomic force microscope was used to measure the electrical properties of carotenoid molecules attached to a gold electrode. The thiolated carotene molecules were embedded in insulating n-alkanethiol self-assembled monolayers. At a contact force of a few nanoNewtons, a carotenoid molecule behaves ohmically with a resistance of approximately 4.2 +/-0.7 G Ohm; over a million times more conductive than an alkane chain of similar length. Modes of electron transport are discussed.
Keywords:SCANNING-TUNNELING-MICROSCOPY;ALKANETHIOL MONOLAYERS;ELECTRON-TRANSFER;AU(111);RESONANCE;FILMS;STM