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Anodic TiO<sub>2</sub> nanotube arrays for photovotaics
노원엽,양화영 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Photovoltaics such as dye-sensitized solar cells (DSSCs), organic-inorganic solar cells, and perovskite solar cells are one of the most promising renewable energy sources. Especially, DSSCs have several advantages such as high energy conversion efficiency, low cost, and a simple process. DSSCs consist of mesoporous TiO<sub>2</sub> nanoparticle (NP) films, sensitizers, electrolyte, and a counter electrode. Generally DSSCs are fabricated with mesoporous TiO<sub>2</sub> NP films that have high surface areas to adsorb sensitizers. However, mesoporous TiO<sub>2</sub> NP films have several limitation such as grain boundary and trapping sites that cause the incremental recombination or loss of many electrons. TiO<sub>2</sub> nanotube arrays (TNTAs), which are prepared by anodization, have a high aspect ratio, vertically-oriented structure, slow recombination, and fast charge transport in DSSCs. Herein, we reported the mechanism of TNTAs by anodization and how to improve the energy conversion efficiency of photovoltaics with TNTAs.
노원엽,Myeoung-Hwan Chun,Ho-Sub Kim,Yoon Bong Hahn,서정쌍,전봉현 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
We prepared dye-sensitized solar cells (DSSCs) with enhanced energy conversion efficiency using open-ended TiO2 nanotube arrays with a TiO2 scattering layer. As compared to closed-ended TiO2 nanotube arrays, the energy conversion efficiency of the open-ended TiO2 nanotube arrays was increased from 5.63% to 5.92%, which is an enhancement of 5.15%. With the TiO2 scattering layer, the energy conversion efficiency was increased from 5.92% to 6.53%, which is an enhancement of 10.30%. After treating the open-ended TiO2 nanotube arrays with TiCl4, the energy conversion efficiency was increased from 6.53% to 6.89%, a 5.51% enhancement, which is attributed to improved light harvesting and increased dye adsorption.
Facile synthesis of monodispersed silica-coated magnetic nanoparticles
노원엽,김형모,경산,강유리,김동혁,강호만,정철환,김동은,이윤식,전봉현 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Silica-coated magnetic nanoparticles (MNPs) have great potential for use in field of biotechnology owing to their unique properties, which can be manipulated by an external magnetic field gradient. Herein, we describe a method for facile synthesis of monodispersed silica-coated MNPs (MNP@SiO2 NPs). Commercially available oleate-MNPs were successfully converted to polyvinylpyrrolidone-MNPs (PVPMNPs), and then coated with silica by the modified Sto¨ ber method. More than 95% of MNPs were individually coated with a silica shell; non-magnetic core silica nanoparticles (NPs) were not detected. Notably, the MNP@SiO2 NPs are highly monodispersed in size (size distribution < 2.5%) and synthesis at the scale of grams was easily obtained by a simple scale up process. Moreover, aggregation was not detected upon storage of over three months.
양화영,노원엽 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Organo-lead halide perovskite solar cells have recently attracted as high power conversion efficiency, low cost production, simple process, flexibility. To improve the power conversion efficiency, the light harvesting is the one of the best way. However, it is difficult to incorporate the light harvesting materials such as large-sized SiO<sub>2</sub>, TiO<sub>2</sub>, or ZrO<sub>2</sub> in thin films layers because of the architectures. In this study, we prepared nanoimprint lithography technique to highlyuniform and well-ordered nanopatterning mesoporous TiO<sub>2</sub> thin films for organo-lead halide perovskite solar cells. The highly-uniform and well-ordered nanopatterning mesoporous TiO<sub>2</sub> thin films were characterized and optimized by FE-SEM and UV-vis spectra. The power conversion efficiency were increased from 14.65% to 15.91% because of the increment of light harvesting by nanopatterning mesoporous TiO<sub>2</sub> thin films in perovskite solar cells.
Ag and Ag─Au Introduced Silica-coated Magnetic Beads
김태한,Xuan-Hung Pham,노원엽,김현모,함은일,하유나,손병성,이상훈,전봉현 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.2
We have developed novel metal-introduced and thiol-modified silica-coated magnetic beads (TM-bead) and report their optical property. A total of six different types of Ag or Ag with Au introduced TM-bead were prepared as follows: Ag was introduced onto TM-bead either by immobilizing pre-synthesized Ag nanoparticles (NPs) onto TM-bead (TM-bead@Ag NPs) or by growing Ag onto TM-bead (TM-bead@AgG). Subsequently, Au ions were introduced onto TM-bead@Ag NPs (TM-bead@Ag NPs@AuG) and TM-bead@AgG (TM-bead@AgG@AuG). Similarly, Au NPs were immobilized onto TM-bead@Ag NPs (TM-bead@Ag NPs&Au NPs) and TM-bead@AgG (TM-bead@AgG&Au NPs). The materials were analyzed by an UV–Vis spectroscopy, a scanning electron microscope and an energy-dispersive X-ray spectroscopy. Obtained under a unified frame, the results provide reliable and valid information against those types of metal based materials. The novel metal-immobilized magnetic beads can also function as plasmonic tunable magnetic beads in biological, material, and chemical applications.
Characterization tools for the analysis of complex biological systems
김효연,한승희,이강훈,노원엽 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The investigation of complex biological systems requires the measurement of specific parameters at a nanometer-scale. This paper covers spectroscopic studies as a tool to characterize each nanometer-scale particle. This review highlights the recent developments on microscopy- based systems analyses, focusing on the characteristics and principles of spectroscopic analysis tools. In this paper, microscopes have been categorized according to their features; 1st generation (Optical Microscope), 2nd generation(Electron Microscope) and 3rd generation(Scanning Probe Microscope, Scanning Tunneling Microscope, Atomic Force Microscopy, Near-field scanning optical Microscopy).