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Nano Research

, Volume 11, Issue 9, pp 4836–4845 | Cite as

Facet-dependent electro-optical properties of cholesteric liquid crystals doped with Cu2O nanocrystals

  • Dongyu Zhao
  • Lihong Xu
  • Yang Shang
  • Xiaoxia Li
  • Lin Guo
Research Article
  • 116 Downloads

Abstract

Excellent electro-optical (E-O) performances are essential for high-quality reflective cholesteric liquid crystal (LC) displays, but are often limited by the high driving voltages required by these displays. Dispersing functional nanomaterials into the LCs has emerged as a promising approach to achieve outstanding E-O properties. In this work, we report the facet-controlled E-O properties of a chiral nematic LC (N*LC) doped with cubic, octahedral, and rhombic dodecahedral Cu2O. The outstanding E-O properties of the doped systems are related to the interaction between the liquid crystals and Cu2O dopants with different exposed crystal planes. Doping with octahedral and rhombic dodecahedral Cu2O reduces the stability of the planar state, as a result of both the surface abundance of active Cu atoms that interact with the polarized LC molecules, and the large amounts of vertexes and edges on the crystal surfaces, which accelerate the transition from the planar to the focal conic state under an applied electric field. Rhombic Cu2O is the most effective dopant for improving the E-O properties of the present LCs, resulting in a 65.31% reduction of the threshold voltage. The facet and morphology effects highlighted in this work provide a new pathway to develop excellent energy-saving meso-materials with exposed high-reactivity facets, improving their potential applications in electro-optical technologies and information displays.

Keywords

Cu2O nanocrystals liquid crystals electro-optical properties host-guest systems facet-dependence 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51673008, 51203005, and 21601009).

Supplementary material

12274_2018_2072_MOESM1_ESM.pdf (1.9 mb)
Facet-dependent electro-optical properties of cholesteric liquid crystals doped with Cu2O nanocrystals

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijingChina
  2. 2.Key Laboratory of Micro-Nano Measurement-Manipulation and Physics, Ministry of Education, School of Physics and Nuclear Energy EngineeringBeihang UniversityBeijingChina

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