Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (5): 578-584.DOI: 10.11944/j.issn.1000-0518.2019.05.180297

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Influence of Pinecone-Like Ferric Oxide on the Electro-Optical Properties of Nematic Liquid Crystals

WANG Meng(),WANG Yan(),WEI Dequan,LIANG Lanju,WANG Yueping,ZHANG Bin   

  1. College of Opto-Electronic Engineering,Zaozhuang University,Zaozhuang,Shandong 277160,China
  • Received:2018-09-10 Accepted:2018-11-29 Published:2019-05-01 Online:2019-05-06
  • Contact: WANG Meng,WANG Yan
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.61701434, No.61735010, No.61675147), the Natural Science Foundation of Shandong Province, China(No.ZR2017MF005, No.ZR2018LF001), the Science and Technology Development Planning Project of Zaozhuang(No.2017GX06).


Liquid crystal(LC) materials are widely used in LC displays(LCD). However, due to the presence of impurities in liquid crystal, the application voltage of liquid crystal becomes large, which results in the increase of energy consumption. In order to decrease the threshold voltage and saturation voltage, nanoparticles are usually added to LC to improve the electro-optical performance. In this paper, pinecone-like ferric oxide(P-Fe2O3) nanoparticles with uniform shape and size were prepared by a simple chemical precipitation method. Nematic liquid crystal 4-cyano-4'-pentylbiphenyl(5CB) is doped with pinecone-like Fe2O3 nanoparticles in different doping contents. The results show that the best electro-optical properties of the LC is achieved when the doping mass fraction is 0.5%. The threshold voltage and saturation voltage decrease by 24.8% and 45.2%, respectively, the contrast ratio increases by 46%, and the response time decreases to 17.6 ms. The property is superior to the ordinary Fe2O3 nanoparticles doped in 5CB with the threshold voltage and saturation voltage decreased by 15% and 16% under the same condition, which is attributed to the uniform dispersion of pinecone-like Fe2O3 in nematic LC 5CB and the adsorption of impurity ions by the rough surface of pinecone-like Fe2O3 abating the shielding effect.

Key words: liquid crystal display, semiconductor nanomaterials, pinecone-like Fe2O3, nematic liquid crystal(NLC), electro-optical properties