Single electron behaviors of DNA-mediated Au Nanoparticle Assebly*

We have fabricated single electron transistors (SET) using DNA-assisted assembly of Au nanoparticles and investigated electrical transport properties of fabricated devices. Most devices exhibited clear Coulomb blockade and Coulomb oscillations, indicating that DNA molecules play a role of tunneling barriers. However, in contrast to conventional single electron transistors, the different periods of Coulomb oscillations are found at different temperatures. Based on orthodox Coulomb blockade model, we propose that the temperature dependence of Coulomb oscillation period is ascribed to the temperature dependence of junction capacitances.