Min Feng,† Xuefeng Guo,‡,§ Xiao Lin,† Xiaobo He,† Wei Ji,† Shixuan Du,† Deqing Zhang,‡ Daoben Zhu,‡ and Hongjun Gao*,†
† Institute of Physics.
‡ Institute of Chemistry.
DOI:10.1021/ja054836j Publication Date: 14 Oct 2005
Nanometer-scale recording on organic thin film media is a promising alternative to future ultrahigh-density information storage. Scanning probe microscope (SPM) has been demonstrated to be an important tool in recording the nanometer patterns on functional organic thin films. For practical applications, functional organics should possess stable switching properties in ambient conditions. Rotaxanes represent a new class of the super molecules and show stability at various chemical states in solution. The key structure of the molecules contains a ð-electron-deficient macrocycle that is locked around a ð-electron-rich component along the molecular “thread” with two bulky “stoppers”. The macrocycle can move between different ð-electron-rich components upon external stimuli, resulting in switching of electronic configuration. This makes rotaxane an interesting candidate for nanorecording. In this communication, we report on stable conductance transitions in solidstate rotaxane-based Langmuir-Blodgett (LB) thin films. Using scanning tunneling microscope (STM), we have achieved reproducible nanometer-scale recording on these films.