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Issue 7, 2014
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Improving the electrical memory performance of pyrazoline moiety via the preparation of its hyperbranched copolymer

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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.

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

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Publication details

The article was received on 11 Nov 2013, accepted on 12 Dec 2013 and first published on 13 Dec 2013


Article type: Paper
DOI: 10.1039/C3PY01588B
Polym. Chem., 2014,5, 2602-2610

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

    C. Lu, Q. Liu, P. Gu, D. Chen, F. Zhou, H. Li, Q. Xu and J. Lu, Polym. Chem., 2014, 5, 2602
    DOI: 10.1039/C3PY01588B

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