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송우섭,이승석,이병일,최은서 한국광학회 2021 Current Optics and Photonics Vol.5 No.3
We propose a characterization method for the scattering property of microspheres using spectroscopic optical coherence tomography (OCT). To prove the effectiveness of the proposed method, we prepare solutions of different concentrations using microspheres ranging from 28 to 2300 nm in diameter. Timefrequency analysis is performed on the measured interference spectrum of each solution, and the resulting spectroscopic information is converted into histograms for centroid wavelengths. The histograms present a very sensitive response to changes in the concentration and size of microspheres. We classify them into three categories according to their characteristics. When the histogram of each category is replaced with the corresponding calculated value of the scattering coefficient, each category is mapped to a different scattering-coefficient region. It is expected that the proposed method could be used to investigate the optical characteristics of a biological sample from OCT images, which would be helpful for optical diagnostic and therapeutic applications.
송우섭,김석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Lithium-sulfur battery is great candidate for next-generation energy storage devices. However, dissolution of lithium polysulfides into organic electrolyte lead to poor cycle performance and rate property of lithium-sulfur battery. Metal organic framework is one of the attractive materials in lithium-sulfur batteries as cathode. MOFs can be used to overcome this limit and prevent the dissolution of lithium polysulfides into the electrolyte. Add graphene oxide to increase electro conductivity with MOF structure. In this study, hydrothermal reaction used to synthesis MOFs and change some experiment condition to control their pore size. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between different pore size MOFs.
송우섭,김석 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Recently, metal organic frameworks (MOFs) have been intensively used as excellent carbon precursors to synthesize nanoporous carbon materials. Because the GO/core-shell MOF composites are efficient nonprecious metal catalysts for oxygen reduction reactions, combining core-shell MOFs with graphene oxide (GO) can derived carbon composites exhibit enhanced electrochemical performance due to the increased electrical conductivity and improve cathode structure as host. In this study, seed-mediated deposition method is used to synthesize MOF/graphene oxide (GO)/MOF nano-sandwiches with core-shell structured MOF (ZIF-8@ZIF-67). For comparison, we used same cell except cathode material which is only graphene oxide. Electrochemical properties were conducted by making coin cell and characterized by cyclic voltammetry in 1M LiTFSI electrolyte.
송우섭,김석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Graphene is one of the promising materials in lithium-sulfur batteries as cathode material. Due to intrinsic high conductivity and excellent stiffness, graphene attributes to improve electrical performance of lithium-sulfur cell. Also one of the promising Q2D material, Molybdenum disulfide (MoS2) prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. In this study, a facile process was used to synthesize MoS2/graphene nanosheets (GNS) composites by one-step in situ solution-phase method. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between MoS2/GNS cells and only GNS cells. Electrochmical properties were conducted by making coin cell and characterized by cyclic voltammetry in 1M LiTFSI electrolyte.
송우섭,김석 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Graphene is one of the promising materials in lithium-sulfur batteries as cathode material, but is somewhat limited to confine sulfur owing to its 2D-structure. Molybdenum disulfide (MoS<sub>2</sub>) can be used to overcome this limits. Molybdenum disulfide (MoS<sub>2</sub>) prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. They are also adjustable their pore size and shape with simple process. In addition to this promising material, the introduction of conductive graphene oxide could provide Li ion pathways. In this study, a facile process was used to synthesize MoS<sub>2</sub>/graphene nanosheets (GNS) composites by one-step in situ solution-phase method. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between MoS<sub>2</sub>/GNS cells and only GNS cells.
송우섭,김석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Graphene is good for sulfur anchor but have limited durability owing to its 2D-structure. Molybdenum disulfide (MoS2) can be used to overcome this limit. Molybdenum disulfide (MoS2) prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. They are also adjustable their pore size and shape with simple process. In addition to this promising material, the introduction of conductive graphene oxide could provide Li ion pathways. In this study, a facile process was used to synthesize MoS2/graphene nanosheets (GNS) composites by one-step in situ solution-phase method. In order to prove these results, electrochemical properties were characterized by cyclic voltammetry experiment between MoS2/GNS cells and only GNS cells.