Conductance switching mechanism of Rose Bengal organic thin films in ambient conditions  

作　　者：蔡莉 郭海明 朱熙 杜世萱 时东霞 高鸿钧 

机构地区：[1]Institute of Physics, the Chinese Academy of Sciences

出　　处：《Chinese Physics B》2009年第4期1622-1626,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos 60771037 and 10774176);the National High Technology Research and Development Program of China (Grant No 2006CB921305)

摘　　要：The molecular thin films of Rose Bengal （RB） embedded in polymethyl methacrylate matrix are fabricated by using the spin-coating technique. The macroscopic current-voltage （I-V） characterization of the film shows that the RB molecule has two conductance switching states with a high ON/OFF ratio in ambient conditions. The infrared spectra indicate that intermolecular hydrogen bonds can form in the RB thin films after their hydrolysis in air. With the first-principles calculations, we demonstrate that the hydrogen bonds will be destroyed in concomitance with the conformational change when the RB molecule switches to its high-conductance state after applying a voltage.The molecular thin films of Rose Bengal （RB） embedded in polymethyl methacrylate matrix are fabricated by using the spin-coating technique. The macroscopic current-voltage （I-V） characterization of the film shows that the RB molecule has two conductance switching states with a high ON/OFF ratio in ambient conditions. The infrared spectra indicate that intermolecular hydrogen bonds can form in the RB thin films after their hydrolysis in air. With the first-principles calculations, we demonstrate that the hydrogen bonds will be destroyed in concomitance with the conformational change when the RB molecule switches to its high-conductance state after applying a voltage.

关 键 词：Rose Bengal conductance transition MECHANISM 

分 类 号：O484.42[理学—固体物理]