Min Feng, Li Gao, Shixuan Du, Zhitao Deng, Zhihai Cheng, Wei Ji, Deqing Zhang, Xuefeng Guo, Xiao Lin, Lifeng Chi, Daoben Zhu, Harald Fuchs, and Hongjun Gao*
Institute of Physics, Chinese Academy of Sciences
Institute of Chemistry, Chinese Academy of Sciences
DOI:10.1002/adfm.200600973 Publication Date: 9 Feb 2007
Rotaxane molecules have attracted considerable interest because of their good performance in both molecular electronic devices and nanoscale data-storage media. Low-temperature scanning tunneling microscopy is used to investigate the structur and conductance of single H2 rotaxane molecules on a buffer-layered Au(111) substrate at 77 K. It is demonstrated that the conductance switching in rotaxane-based, solid-state devices is an inherent property of the rotaxane molecules. These results provide evidence that the conductance switching might arise from the movement of the cyclobis(paraquat-p-phenylene) ring along the rod section of the dumbbell-shaped backbone of the rotaxane molecule.