给体-受体型聚西佛碱的电致阻变效应

Resistive Switching Properties in D-A Type Poly(Schiff Base): Study

在酸性环境下,利用4,4,-双(3-硝基-4-甲酰基苯基硫醚)二苯砜与4,4’-二氨基-4’’-甲基三苯胺的缩聚反应制备给体-受体型的聚西佛碱(PA).其中二苯砜单体为聚合物的电荷受体单元,而三苯胺为电荷给体单元.在电场的作用下,Pt/PA/ITO具有较稳定、可重复的电致阻变效应.其物理机制是材料中给体和受体间发生了电荷转移,由初始高电阻状态的给体-受体结构转变到低电阻状态的给体+-受体-结构.

Donor-acceptor （D-A） poly（Schiff base） derivative （or polyazothine, PA）, incorporating the 4,4’-bis（3-nitro-4-formyl phenylthio）diphenyl sulfone group acting as an electron acceptor unity and the 4,4’-diamino-4’’-methyltriphenylamine group acting as an donor unity, respectively, is synthesized successfully via polycondensation reaction under acidic conditions. The as-fabricated Pt/PA/ITO device shows the stable and repeatable resistive switching behavior which originates from the charge transfer interaction between the electron donor-acceptor pairs. This process may lead the pristine high resistance state of the D-A structured polymer to the low resistance state of the charge-separated D＋-A-structure.