Abstract 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.
Received: 28 July 2008
Revised: 25 August 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 60771037 and
10774176) and the National High Technology Research and Development
Program of China (Grant No 2006CB921305).
Cite this article:
Cai Li(蔡莉), Guo Hai-Ming(郭海明), Zhu Xi(朱熙), Du Shi-Xuan(杜世萱), Shi Dong-Xia(时东霞), and Gao Hong-Jun(高鸿钧) Conductance switching mechanism of Rose Bengal organic thin films in ambient conditions 2009 Chin. Phys. B 18 1622
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