Conductance switching mechanism of Rose Bengal organic thin films in ambient conditions |
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Authors: | Cai Li Guo Hai-Ming Zhu Xi Du Shi-Xuan Shi Dong-Xia and Gao Hong-Jun |
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Institution: | Institute of Physics, the Chinese Academy of Sciences, Beijing 100190, China |
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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. |
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Keywords: | Rose Bengal conductance
transition mechanism |
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