Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal

We investigated the effect of reduced graphene oxide (rGO) doping on the birefringence of 5CB liquid crystal (LC). The characteristics of the synthesized rGO and LC-rGO composite with different rGO concentrations were analyzed by atomic force microscopy, X-ray photoelectron spectroscopy, white light...

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Main Authors:	Mareddi Bharath Kumar, Mohammad Awwal Adeshina, Daekyung Kang, Youngho Jee, Taewan Kim, Muhan Choi, Jonghoo Park
Format:	Article
Language:	English
Published:	MDPI AG 2020-04-01
Series:	Nanomaterials
Subjects:	reduced graphene oxide liquid crystal phase modulator birefringence
Online Access:	https://www.mdpi.com/2079-4991/10/5/842

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spelling	doaj-db083fdf69144118a591833da5cd46f82020-11-25T03:11:23ZengMDPI AGNanomaterials2079-49912020-04-011084284210.3390/nano10050842Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid CrystalMareddi Bharath Kumar0Mohammad Awwal Adeshina1Daekyung Kang2Youngho Jee3Taewan Kim4Muhan Choi5Jonghoo Park6Department of Electrical Engineering, Kyungpook National University, Daegu 41566, KoreaDepartment of Electrical Engineering, Kyungpook National University, Daegu 41566, KoreaDepartment of Electrical Engineering, Kyungpook National University, Daegu 41566, KoreaDepartment Chemistry, Kyungpook National University, Daegu 41566, KoreaDepartment of Electrical Engineering and Smart Grid Research Center, Jeonbuk National University, Jeonju 54896, KoreaSchool of Electronics Engineering, Kyungpook National University, Daegu 41566, KoreaDepartment of Electrical Engineering, Kyungpook National University, Daegu 41566, KoreaWe investigated the effect of reduced graphene oxide (rGO) doping on the birefringence of 5CB liquid crystal (LC). The characteristics of the synthesized rGO and LC-rGO composite with different rGO concentrations were analyzed by atomic force microscopy, X-ray photoelectron spectroscopy, white light polarized microscopy, voltage-dependent transmission measurement, and differential scanning calorimetry. We found that doping LC with an appropriate concentration of rGO enhances the birefringence of the LC. This is mainly due to the improved anisotropy of polarizability, which stems from the high shape anisotropy of rGO. However, the aggregation of rGO reduces the birefringence by decreasing the anisotropy of polarizability as well as the order parameter. Our study shows the promising potential of LC-rGO for developing various electro-optic devices that offer improved electro-optic effects.https://www.mdpi.com/2079-4991/10/5/842reduced graphene oxideliquid crystalphase modulatorbirefringence
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Mareddi Bharath Kumar Mohammad Awwal Adeshina Daekyung Kang Youngho Jee Taewan Kim Muhan Choi Jonghoo Park
spellingShingle	Mareddi Bharath Kumar Mohammad Awwal Adeshina Daekyung Kang Youngho Jee Taewan Kim Muhan Choi Jonghoo Park Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal Nanomaterials reduced graphene oxide liquid crystal phase modulator birefringence
author_facet	Mareddi Bharath Kumar Mohammad Awwal Adeshina Daekyung Kang Youngho Jee Taewan Kim Muhan Choi Jonghoo Park
author_sort	Mareddi Bharath Kumar
title	Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal
title_short	Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal
title_full	Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal
title_fullStr	Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal
title_full_unstemmed	Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal
title_sort	enhancement of birefringence in reduced graphene oxide doped liquid crystal
publisher	MDPI AG
series	Nanomaterials
issn	2079-4991
publishDate	2020-04-01
description	We investigated the effect of reduced graphene oxide (rGO) doping on the birefringence of 5CB liquid crystal (LC). The characteristics of the synthesized rGO and LC-rGO composite with different rGO concentrations were analyzed by atomic force microscopy, X-ray photoelectron spectroscopy, white light polarized microscopy, voltage-dependent transmission measurement, and differential scanning calorimetry. We found that doping LC with an appropriate concentration of rGO enhances the birefringence of the LC. This is mainly due to the improved anisotropy of polarizability, which stems from the high shape anisotropy of rGO. However, the aggregation of rGO reduces the birefringence by decreasing the anisotropy of polarizability as well as the order parameter. Our study shows the promising potential of LC-rGO for developing various electro-optic devices that offer improved electro-optic effects.
topic	reduced graphene oxide liquid crystal phase modulator birefringence
url	https://www.mdpi.com/2079-4991/10/5/842
work_keys_str_mv	AT mareddibharathkumar enhancementofbirefringenceinreducedgrapheneoxidedopedliquidcrystal AT mohammadawwaladeshina enhancementofbirefringenceinreducedgrapheneoxidedopedliquidcrystal AT daekyungkang enhancementofbirefringenceinreducedgrapheneoxidedopedliquidcrystal AT younghojee enhancementofbirefringenceinreducedgrapheneoxidedopedliquidcrystal AT taewankim enhancementofbirefringenceinreducedgrapheneoxidedopedliquidcrystal AT muhanchoi enhancementofbirefringenceinreducedgrapheneoxidedopedliquidcrystal AT jonghoopark enhancementofbirefringenceinreducedgrapheneoxidedopedliquidcrystal
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Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal

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