4.5 Article

Dithienylmaleimide-based D-A Conjugated Polymer Film: Photo-Responsive Behavior and Application in Electrical Memory and Logic Gates

期刊

CHINESE JOURNAL OF POLYMER SCIENCE
卷 39, 期 9, 页码 1177-1184

出版社

SPRINGER
DOI: 10.1007/s10118-021-2594-z

关键词

Dithienylmaleimide; Photo-response; Electrical memory; Logic gate

资金

  1. National Natural Science Foundation of China [22075044, 21574021]
  2. Natural Science Foundation of Fujian Province [2018J01670]
  3. Educational Commission of Fujian Province [JAT170129]
  4. Scientific Research Starting Foundation for researchers with PhD of Fujian Normal University
  5. Fujian Normal University

向作者/读者索取更多资源

Solid-stated smart polymers responsive to external stimuli, such as the D-A type copolymer PTMF-o containing 3,4-bisthienylmaleimide and fluorene, exhibit photo-response with color alteration upon sunlight irradiation. The oxidative photocyclization of 3,4-bisthienylmaleimide unit weakens charge transfer ability and results in resistive storage performance in PTMF-o film, which can be transformed into a FLASH type behavior after exposure. Furthermore, PTMF-o film can be used to construct NAND and NOR logic gates with light as input condition, providing a simple way to modify the electronic properties of polymers and realize stimuli-response in solid states.
Solid-stated smart polymers responsive to external stimuli have attracted much attention for potential application in the field of photoelectron devices, logic gates, sensor, data storage and security. However, it is a bigger challenge for polymers than that for small molecules in solid state to acquire stimuli-responsive properties, because polymers with high molecular weight are not as easy to change the packing structure as small molecules under external stimulation. Here, a D-A type alternating copolymer PTMF-o containing 3,4-bisthienylmaleimide (A unit) and fluorene (D unit) is designed and synthesized. Upon irradiation of sunlight, PTMF-o film exhibits a photo-response with the color altering from purple to colorless. It is attributed to the structure of copolymer transformed from ring-opening form (PTMF-o) to ring-closure form (PTMF-c), resulting from the oxidative photocyclization of 3,4-bisthienylmaleimide unit. Consequently, the ability of charge transfer (CT) from fluorene to 3,4-bisthienylmaleimide unit in PTMF-o can be easily weakened by light stimuli. PTMF-o film displays a WORM-type resistive storage performance for the strong CT. Interestingly, after exposure, the electrical memory behavior in situ transfers into FLASH type, due to weak CT in PTMF-c. PTMF-o film can also be employed as smart material to construct NAND and NOR logic gates by using light as input condition. The work provides a simple way to modify the electronic properties of polymers and realize stimuli-response in solid states.

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