4.7 Article

Viologen-based conjugated ionic polymer for nonvolatile rewritable memory device

Journal

EUROPEAN POLYMER JOURNAL
Volume 94, Issue -, Pages 222-229

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2017.07.010

Keywords

Viologen; Triphenylamine; Nonvolatile rewritable memory; Materials synthesis

Funding

  1. National Natural Science Foundation of China, China [51333002, 51403126, 21404037, 61378072]
  2. Fundamental Research Funds for the Central Universities, China [WJ1514311]
  3. Pujiang Program, China [16PJ1402400]
  4. Chenguang Program, China [15CG28]

Ask authors/readers for more resources

A novel soluble viologen-based conjugated ionic copolymer, PTPA-V, was synthesized by using Suzuki coupling reaction in the presence of the tetrakis(triphenylphosphine)palladium(0) as the catalyst. Its HOMO, LUMO, EA, IP and Eg values derived from the CV data are -5.44, -3.10, 3.07, 5.70 and 2.34 eV, respectively. The maximum absorption peak observed in the UV/Vis absorption spectrum of the PTPA-V thin film was shifted to the red by about 10 nm, suggesting stronger aggregation effect occurred in the thin film. The fluorescence decay profiles of the singlet excited state of PTPA-V in different deaerated organic solvents revealed a mono-exponential decay with a lifetime of 8.9 ns (toluene), 6.4 ns (THF) and 5.2 ns (DMF). The as-prepared electronic device with a configuration of Al/PTPA-V/ITO exhibited two accessible conductivity states, La, the high-conductivity (ON) state and the low-conductivity (OFF) state. A typical nonvolatile rewritable memory behavior was observed, with turn-on and turn-off voltages of -1.92 and 2.67 V, and a large ON/OFF current ratio of more than 10(5). Unlike poly(triphenylamine) without any electron paramagnetic resonance (EPR) signal, PTPA-V shows an EPR signal with a g factor of 2.004, suggesting existence of unpaired electrons or free radicals in this polymer due to the charge transfer between the triphenylamine (TPA) moieties and the viologen (V) moieties, which resulted in the formation of TPA(.+) and V.-.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available