期刊
ADVANCED SCIENCE
卷 8, 期 8, 页码 -出版社
WILEY
DOI: 10.1002/advs.202004749
关键词
dielectric structuring; dynamic surface topographies; imprinted polymer flow pattern; liquid crystal polymer
资金
- National Key R&D Program of China [2020YFE0100200]
- Science and Technology project of Guangdong Province [2018A030313929]
- Science and Technology Program of Guangzhou [2019050001]
- Program for Chang Jiang Scholars and Innovative Research Teams in Universities [IRT_17R40]
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology [2017B030301007]
- MOE International Laboratory for Optical Information Technologies
- 111 Project
- Yunnan expert workstation, European Research Commission under ERC Advanced Grant [66999]
- NWO VENI grant [15135]
The paper presents a method based on molecular self-assembling of liquid crystal polymers to directly translate 2D molecular director profiles into 3D topographies without multi-step lithographic processes. By activating LCPs through an electric field, surface deformation can occur to induce topographies governed by the director profile. The approach opens new opportunities for optical and electrical applications.
Morphological properties of surfaces play a key role in natural and man-made objects. The development of robust methods to fabricate micro/nano surface structures has been a long pursuit. Herein, an approach based on molecular self-assembling of liquid crystal polymers (LCPs) is presented to directly translate 2D molecular director profiles obtained by a photoalignment procedure into 3D topographies, without involving further multi-step lithographic processes. The principle of surface deformation from a flat morphology into complex topographies is based on the coupling between electrostatic interactions and the anisotropic flow in LCPs. When activated by an electric field, the LCP melts and is driven by electrohydrodynamic instabilities to connect the electrode plates of a capacitor, inducing topographies governed by the director profile of the LCP. Upon switching off the electric field, the formed structures vitrify as the temperature decreases below the glass transition. When heated, the process is reversible as the formed topographies disappear. By pre-programming the molecular director a variety of structures could be made with increasing complexity. The height, pitch, and the aspect ratio of the textures are further regulated by the conditions of the applied electric field. The proposed approach will open new opportunities for optical and electrical applications.
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