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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.
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 2020, 10, 842 .
AMA StyleMareddi 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. 2020; 10 (5):842.
Chicago/Turabian StyleMareddi Bharath Kumar; Mohammad Awwal Adeshina; Daekyung Kang; Youngho Jee; Taewan Kim; Muhan Choi; Jonghoo Park. 2020. "Enhancement of Birefringence in Reduced Graphene Oxide Doped Liquid Crystal." Nanomaterials 10, no. 5: 842.
Quantum dots have diverse chemical properties with different ligands attached on the surface. The cysteamine has been used as a ligand for various quantum dots because it has high solubility in water, and it facilitates binding of quantum dot and gold surface. However, the hydrogen bonds in cysteamine cause aggregation of the cysteamine capped quantum dots. In this study, we suggested a simple synthesis method of aggregation-free PbS quantum dot and analyzed the electric and optical properties of the synthesized quantum dot. This study on aggregation-free cysteamine capped quantum dots has the potential to develop advanced quantum dot-based sensor technologies, including biomedical imaging and environmental sensors.
Daekyung Kang; Mareddi Bharath Kumar; Changhee Son; Hongsik Park; Jonghoo Park. Simple Synthesis Method and Characterizations of Aggregation-Free Cysteamine Capped PbS Quantum Dot. Applied Sciences 2019, 9, 4661 .
AMA StyleDaekyung Kang, Mareddi Bharath Kumar, Changhee Son, Hongsik Park, Jonghoo Park. Simple Synthesis Method and Characterizations of Aggregation-Free Cysteamine Capped PbS Quantum Dot. Applied Sciences. 2019; 9 (21):4661.
Chicago/Turabian StyleDaekyung Kang; Mareddi Bharath Kumar; Changhee Son; Hongsik Park; Jonghoo Park. 2019. "Simple Synthesis Method and Characterizations of Aggregation-Free Cysteamine Capped PbS Quantum Dot." Applied Sciences 9, no. 21: 4661.