High electrical characteristics through graphene oxide doping process on physicochemically reformed inorganic thin
Da-Bin Yang1, Jin Young Oh1, Bo-Kyeong Choi1
1IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea.
The Journal of Chemical Physics
|December 5, 2023
Summary
Graphene oxide (GO) doping in liquid crystal (LC) cells improves electro-optical properties. GO enhances surface anchoring energy and reduces residual voltage, making it suitable for advanced displays.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Liquid crystal (LC) displays require precise alignment layers for optimal performance.
- Traditional alignment methods like rubbing polyimide can be complex and costly.
- Graphene oxide (GO) is a promising nanomaterial for surface modification due to its unique properties.
Purpose of the Study:
- To investigate the effect of graphene oxide (GO) doping on the electro-optical properties of liquid crystal (LC) cells.
- To analyze the surface morphology and chemical changes induced by GO doping.
- To evaluate the potential of GO-doped alignment layers for next-generation displays.
Main Methods:
- Fabrication of LC cells using brush coating with varying concentrations of GO doping.
- Surface morphology analysis using atomic force microscopy (AFM).
- Chemical bonding analysis using X-ray photoelectron spectroscopy (XPS).
- Measurement of residual DC voltage and anchoring energy.
Main Results:
- Increased GO concentration led to larger groove sizes on the surface while maintaining brush direction.
- XPS confirmed an increase in C-C and O-Sn bonds with higher GO concentrations.
- Residual DC voltage decreased, indicated by a narrower hysteresis curve, as GO concentration increased.
- A 15% GO-doped sample showed a significant increase in anchoring energy (1.34 × 10-3 J/m2), comparable to rubbed polyimide.
Conclusions:
- GO doping enhances the anchoring energy of LC alignment layers through increased van der Waals forces.
- Brush-coated GO-doped alignment layers exhibit improved electro-optical properties and reduced residual DC voltage.
- This simple fabrication method offers a viable route for developing high-performance, next-generation thin-film displays.
