title: Guided Electro-Optical Switching of Small Graphene Oxide Particles by Larger Ones in Aqueous Dispersion.
abstract: Although the large Kerr coefficient of aqueous graphene oxide (GO) dispersions is quite attractive for electro-optical applications with low power consumption, the maximum birefringence of GO dispersions is not sufficiently high for actual display applications. Here we report that adding a small amount of larger GO particles (about 4 μm) into a high-concentration dispersion of small GO (about 0.2 μm) can improve the electro-optical sensitivity to an electric field and also the maximum birefringence. Large GOs induce the ordering of small particles and enhance the electro-optical switching. Large GOs have higher polarizability and are easily driven under an applied electric field, and the rotational motion of large GO particles leads to switching of surrounding small GO particles, improving the electro-optical performance. The binary mixture can overcome the limitations of pure dispersions of large GO or small GO particles; the former has high interparticle interaction, and the latter has low sensitivity to an electric field.
authors.affiliation: School of Electronic and Electrical Engineering, Sungkyunkwan University , Suwon, Gyeonggi-do 440-746, South Korea.|Department of Electrical Engineering, University of Engineering and Technology , Lahore, Pakistan.
authors.forename: Rana Tariq Mehmood
authors.initials: RT
authors.lastname: Ahmad
authors.affiliation: School of Electronic and Electrical Engineering, Sungkyunkwan University , Suwon, Gyeonggi-do 440-746, South Korea.
authors.forename: Tian-Zi
authors.initials: TZ
authors.lastname: Shen
authors.affiliation: School of Electronic and Electrical Engineering, Sungkyunkwan University , Suwon, Gyeonggi-do 440-746, South Korea.
authors.forename: Aurangzeb Rashid
authors.initials: AR
authors.lastname: Masud
authors.affiliation: School of Electronic and Electrical Engineering, Sungkyunkwan University , Suwon, Gyeonggi-do 440-746, South Korea.
authors.forename: Thilini K
authors.initials: TK
authors.lastname: Ekanayaka
authors.affiliation: School of Electronic and Electrical Engineering, Sungkyunkwan University , Suwon, Gyeonggi-do 440-746, South Korea.
authors.forename: Bomi
authors.initials: B
authors.lastname: Lee
authors.affiliation: School of Electronic and Electrical Engineering, Sungkyunkwan University , Suwon, Gyeonggi-do 440-746, South Korea.
authors.forename: Jang-Kun
authors.identifier: 0000-0003-1666-8438
authors.initials: JK
authors.lastname: Song