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Epitaxial growth of multi-layer hexagonal boron nitride on sapphire
장아랑,신현석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Large-scale growth of high-quality hexagonal boron nitride has been a challenge in two-dimensional-material-based electronics. Herein, we present wafer-scale and wrinkle-free epitaxial growth of multi-layer hexagonal boron nitride on a sapphire substrate by using low-pressure chemical vapor deposition. Microscopic and spectroscopic investigations and theoretical calculations reveal that synthesized hexagonal boron nitride has a single rotational orientation with AA` stacking order. A facile method for transferring hexagonal boron nitride onto other target substrates was developed, which provides the opportunity for using hexagonal boron nitride as a substrate in practical electronic circuits. A graphene field effect transistor fabricated on our hexagonal boron nitride sheets shows highly improved carrier mobility, because the ultra-flatness of the hexagonal boron nitride surface can reduce the substrate-induced degradation of the carrier mobility of two-dimensional materials.
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Biological functionality of active enzyme structures immobilized on various solid surfaces
김동청,장아랑,강대준 한국물리학회 2009 Current Applied Physics Vol.9 No.6
We have investigated biological functionality of immobilized enzyme structures according to the immobilizing routes and the surface properties. Horse radish peroxidase (HRP) was immobilized on various solid surfaces such as gold, SiO2, sapphire and anodized aluminum oxide (AAO) membrane via non-specific adsorption, avidin-mediated and biotin/avidin-mediated layer-by-layer (LBL) assembly. The catalytic activity as a measure of biological functionality, of the biotin-HRP immobilized by avidin-mediated LBL assembly was found to be better than that of the directly adsorbed HRP on the surfaces of gold, SiO2, sapphire and AAO due to the easy accessibility of reactants to active sites as well as the retention of three dimensional native structure of enzyme for bioactive functionality. In addition, the catalytic activity of the biotin-HRP in LBL-assembled avidin/biotin-HRP on AAO membrane was found to be highly better than that on other substrates due to the increasing amount of immobilized HRP which can be attributed to the high surface area of the substrate. SEM images show that the functional avidin/biotin-HRP enzyme structures were successfully realized by a sequential process of non-specific adsorption and LBL assembly via biotin–avidin interaction.
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Fabrication of Layer-By-Layer Assembled Bio-Architecture on Gold Nanorods
강대준,김동청,장아랑,유상훈,박성호 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
We have successfully fabricated a layer-by-layer (LBL)-assembled functional bio-architecture on gold nanorod substrates with an increased number of immobilized biomolecules. The vertical array of gold nanorods was fabricated through an electrochemical process, using porous aluminum oxide as a template and the dispersed lm of gold nanorods was prepared by using the Langmuir-Blodgett technique. Horse radish peroxidase was immobilized on the vertical array and on the dispersed film of gold nanorods through LBL assembly by using the specic interaction between avidin-biotin molecules. The levels of catalytic activity of the LBL-assembled bio-architectures fabricated on both the vertical array and the dispersed film of gold nanorods were, respectively, ∽2.8 and ∽1.5 times better than that of the flat gold surface due to an increase in surface area and ease of substrate accessibility. Scanning electron microscopy (SEM) and fluorescence images clearly show a regular, successively well-controlled LBL-assembled bio-architecture with a bilayer structure of proteins on gold nanorods. This controlled fabrication of biologically active enzymes on gold nanorod structures via LBL assembly demonstrates a technique for the development of bio-functional molecular devices with enhanced sensitivities and fast response time.
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Ko Yong-il,Kim Min Jae,Lee Dong Yun,남정태,Kim Keun Soo,장아랑 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.4
A gas detection system that monitors harmful gases is critical for the preservation of the global environment and human health. Owing to the increased interest in fexible devices for various types of wearable applications as future electronics, the development of materials and substrates for fexible gas sensing platforms has also accelerated signifcantly. In this regard, carbon nanomaterials have been extensively investigated as gas sensing materials due to their superior physicochemical properties, gas adsorption/desorption behavior, and conductivity due to their high specifc surface area. However, they are difcult to apply as fexible devices because the high-temperature heat treatment is inefcient in terms of cost and process time, and the prepared materials become rigid after carbonization. As a result, we used a laser-assisted chemical vapor deposition (CVD) system in this study to fabricate laser-scribed carbon nanomaterials (LSC) for fexible gas sensor applications at a lower cost and in a shorter time frame than conventional high-temperature heat treatment approaches. A polyimide (PI) flm was used as the carbonization precursor and substrate, resulting in the fabrication of a fexible sensor without the use of a carbon nanomaterial separation process after synthesis. The synthesized material has a stereoscopic 3D structure, which is advantageous for sensing target gas, and responds to polarized molecules such as acetone, nitrogen dioxide, and ammonia by changing its electrical resistance.
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