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Effect of high energy electron beam irradiation at ambient environment on CNT film
유제승,서영수 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In the solution-based coating for preparing carbon nanotube (CNT) film, it is necessary to disperse strongly bound CNTs with surfactants. Electrical conductivity of the CNT film is reduced because contact resistance between the tubes increases by intervention of the surfactant in the contact region. In this study, high energy electron beam at normal temperature and pressure was irradiated on the film to improve conductivity, which is capable of large area processing and environmentally friendly. Electrical conductivity of the film was monitored in terms of electron beam dose and energy and CNT morphology was checked by Raman scattering and TEM. Conductivity was measured using four point probe. Electron beam irradiated CNT films can be applied to flexible transparent films, solar cells, sensors, light convertsion optical films and high heat radiation thin films.
유제승,서영수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Fe3O4-reduced graphene oxide (rGO) composite has recently become a hot topic in various fields such as MRI, drug delivery, battery, and supercapacitor due to its synergistic effects between them. Here we developed a simple and cost-effective method assisted by ultrasound where hydrophobic nanoparticle forms hydrophobic bonding to hydrophobic part on graphene oxide. And we applied an electrospray method, which is a deposition technique that can be applied in industry due to low-cost and high-speed processing, for fabricating supercapacitor electrodes using Fe3O4- rGO composite as a binder-free method. Chemical structure of the composite was confirmed by UV-vis spectrometer, FTIR, and Raman scattering, and its morphology was monitored by TEM, SEM, and XRD. We tested the stability of the composite by galvanostatic charge/discharge and defined the specific capacitance. The nanocomposite film could be a promising candidate for high performance energy storage application.
Fabrication of graphene film by electrospray using positively and negatively charged graphene oxide
유제승,서영수 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Graphene films have been studied for a variety of applications such as field emission display, transparent electrodes, and the field effect transistors. Electrospray deposition is solution-processed technique that can be applied in industry due to low-cost and high-speed processing time. In this study, we developed multilayered graphene oxide (GO) film by electrospray of positively and negatively charged GO solution followed by several reduction methods such as chemical and annealing reduction. Electrical conductivity (S) and optical transmittance of the graphene films have been measured in terms of film thickness and reduction methods. We found that S has been improved by the alternative spray using positively and negatively charged GO instead of using single component. The GO films were characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), and UV- visible spectroscopy.
유제승,서영수 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
We have fabricated magnetite nanoparticle-graphene oxide (GO) hybrids through a non-chemical and one-step process in which nanoparticles are attached to hydrophobic regions of graphite oxide (multi-layered GO) assisted by ultrasound in an aqueous solution. Simultaneously, graphite oxide was peeled off to form GO. Unlike chemical methods such as precipitation, oxygen-containing functional groups on GO have not been consumed or reduced during the hybridization, and therefore this hybrid had a good water solubility and high adsorption capacity for heavy metal ions such as Pb (II) and Au (III) that usually interact with oxygen-containing functional groups on GO. After the adsorption, the hybrid was easily collected using a magnet. This method can also be applied for hybridizing various hydrophobic nanoparticles with GO.