NDLI: Improving the electrical memory performance of pyrazoline moiety via the preparation of its hyperbranched copolymer

Content Provider	Royal Society of Chemistry (RSC)
Author	Gu, Peiyang Li, Hua Zhou, Feng Chen, Dongyun Lu, Caijian Liu, Quan Lu, Jianmei Xu, Qingfeng
Copyright Year	2014
Abstract	An organic small molecule 4-(1,3-diphenyl-4,5-dihydro-1H-pyrazol-5-yl)-N,N-dimethylaniline (ATPP) bearing a pyrazoline moiety was investigated as an electrical memory material. ATPP as an electro-active film was fabricated by thermal evaporation and then prepared as a sandwich memory device (ITO/ATPP/Al). The as-prepared device exhibited different memory behaviors from nonvolatile ‘switch-off’ to volatile static random access memory (SRAM) via decreasing the compliance currents from 0.1 A to 0.001 A. To avoid the switch-off phenomenon caused by the diffusion of aluminium (Al) atoms, a hyperbranched polystyrene (HPPS) through the copolymerization of ‘inimer’ based on ATPP and styrene using self-condensing vinyl polymerization (SCVP) was introduced herein. The hyperbranched structure of HPPS widened the distance between the inimers and reduced the possibility of Al atoms penetration. The HPPS-based memory device exhibited stable SRAM behavior, even at a compliance of 0.1 A with a low switching threshold voltage of about −2.5 V and an ON/OFF current ratio in excess of 104. The SRAM performance of ATPP and HPPS was attributed to the unstable electric-field-induced intramolecular charge transfer (ICT), which was verified by theoretical calculation and UV-vis spectra changes before and after applying the electric field.
Starting Page	2602
Ending Page	2610
Page Count	9
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	5
Issue Number	7
Journal	Polymer Chemistry
DOI	10.1039/c3py01588b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Polymerization Aluminium Polystyrene ATPP Pyrazoline Sandwich compound Static random-access memory Electric field Dimethylaniline Styrene Random-access memory Threshold voltage Diffusion
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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