Optimization of particle size for high birefringence and fast switching time in electro-optical switching of graphene oxide dispersionsopen access
- Authors
- Ahmad R.T.M.[Ahmad R.T.M.]; Hong S.-H.[Hong S.-H.]; Shen T.-Z.[Shen T.-Z.]; Song J.-K.[Song J.-K.]
- Issue Date
- 2015
- Citation
- Optics Express, v.23, no.4, pp.4435 - 4440
- Journal Title
- Optics Express
- Volume
- 23
- Number
- 4
- Start Page
- 4435
- End Page
- 4440
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/49090
- DOI
- 10.1364/OE.23.004435
- Abstract
- In order to use graphene oxide (GO) dispersions for electro-optical applications, both a high GO concentration and a high electrical sensitivity are essential; however, these have not been achieved to date. Here, we report that by optimizing the mean size of GO particles to approximately 0.5 μm, one can obtain a high GO concentration of up to 2 wt% and high electrical sensitivity simultaneously. By reducing the mean GO-particle size, the interparticle interaction and the rotational viscosity can be significantly reduced, and a high-concentration isotropic phase can be obtained. As a result, the maximum birefringence increases and the dynamic response becomes faster. However, further decrease of the mean size below 0.1 μm causes a decrease in the anisotropy of electrical polarizability, resulting in the reduction of the electrical sensitivity of GO dispersions.
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Collections - Information and Communication Engineering > School of Electronic and Electrical Engineering > 1. Journal Articles
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