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

• 来源期刊: 中国物理B（英文版）
• 关键词: Rose Bengal conductance transition mechanism
• 年，卷（期）: 2009,（4）
• 页码范围: 1622-1626
• 页数: 5页
• 语种: 英文

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.