Memristive devices have shown promising applications in various fields (e.g., non‐volatile memory, reconfigurable switches, and bio‐inspired neuromorphic computing). Despite the significant advances in this field, the exploration of nanomaterials with tunable composition, thickness, dimension, and conductivity for memristive devices is still in great necessity. Here, the transformation of the ultrathin film polydopamine (PDA) obtained at air/water interface from amorphous to quasi‐ordered structure is revealed. Owing to the unique feature, the self‐assembled PDA film at air/water interface is firstly employed as the active material in constructing write‐once‐read‐many‐times (WORM) memory devices. With an increase in the applied electric field, the device shows a switching from high resistance state (HRS, OFF state) to low resistance state (LRS, ON state) with a high ON/OFF current ratio of >10³. Furthermore, the abundant amidogen and phenolic hydroxyl group enable the in situ Ag nanoparticle decoration on the PDA film, which can be further used in the construction of anisotropic volatile memristors with a high ON/OFF current ratio (>10⁴), exceptional stability and good integrability.

中文翻译：

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在空气/水界面处自组装的聚多巴胺薄膜，用于有机电子存储设备

忆阻设备在各个领域（例如，非易失性存储器，可重新配置的开关以及受生物启发的神经形态计算）已显示出有希望的应用。尽管在该领域取得了重大进展，但仍迫切需要探索具有可调组成，厚度，尺寸和电导率的忆阻器件纳米材料。在这里，揭示了在空气/水界面处获得的超薄膜聚多巴胺（PDA）从无定形到准有序结构的转变。由于其独特的功能，在空气/水界面处的自组装PDA薄膜首先被用作构造一次写入多次读取（WORM）存储设备的活性材料。随着施加电场的增加，该器件显示出从高电阻状态（HRS，OFF状态）切换到低电阻状态（LRS，³。此外，丰富的酰胺基和酚羟基能够在PDA膜上进行原位Ag纳米颗粒装饰，可进一步用于具有高ON / OFF电流比（> 10 ⁴），稳定性和稳定性高的各向异性挥发性忆阻器的构造中良好的可集成性。