• Title/Summary/Keyword: Nano-coating

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A Comparative Study of Nanocrystalline HfN Coatings Fabricated by Direct Current and Inductively Coupled Plasma Assisted Magnetron Sputtering (DC 스퍼터법과 유도결합형 플라즈마 스퍼터법으로 증착된 HfN 코팅막의 물성 비교연구)

  • Jeon, Seong-Yong;Lee, So-Yeon
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2017.05a
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    • pp.103.1-103.1
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    • 2017

  • Nanocrystalline HfN coatings were prepared by reactively sputtering Hf metal target with N2 gas using a magnetron sputtering system operated in DC and ICP (inductively coupled plasma) condition with various powers. The effects of ICP power, ranging from 0 to 200 W, on the coating microstructure, corrosion and mechanical properties were systematically investigated with FE-SEM, AFM, potentiostat and nanoindentation. The results show that ICP power has a significant influence on coating microstructure and mechanical properties of HfN coatings. With the increasing of ICP power, coating microstructure evolves from the columnar structure of DC process to a highly dense one. Average grain size and nano hardness of HfN coatings were also investigated with increasing ICP powers.

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Anti-corrosive Effects of Multi-Walled Carbon Nano Tube and Zinc Particle Shapes on Zinc Ethyl Silicate Coated Carbon Steel

  • Jang, JiMan;Shon, MinYoung;Kwak, SamTak
    • Corrosion Science and Technology
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    • v.15 no.1
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    • pp.1-5
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    • 2016

  • Zinc ethyl silicate coatings containing multi walled carbon nanotubes (MWCNTs) were prepared, to which we added spherical and flake shaped zinc particles. The anti-corrosive effects of MWCNTs and zinc shapes on the zinc ethyl silicate coated carbon steel was examined, using electrochemical impedance spectroscopy and corrosion potential measurement. The results of EIS and corrosion potential measurement showed that the zinc ethyl silicate coated with flake shaped zinc particles and MWCNT showed lesser protection to corrosion. These outcomes were in agreement with previous results of corrosion potential and corrosion occurrence.

  • https://doi.org/10.14773/cst.2016.15.1.1 인용 PDF KSCI

Design of an Antireflection Coating for High-efficiency Superconducting Nanowire Single-photon Detectors

  • Choi, Jiman;Choi, Gahyun;Lee, Sun Kyung;Park, Kibog;Song, Woon;Lee, Dong-Hoon;Chong, Yonuk
    • Current Optics and Photonics
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    • v.5 no.4
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    • pp.375-383
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    • 2021

  • We present a simulation method to design antireflection coating (ARCs) for fiber-coupled superconducting nanowire single-photon detectors. Using a finite-element method, the absorptance of the nanowire is calculated for a defined unit-cell structure consisting of a fiber, ARC layer, nanowire absorber, distributed Bragg reflector (DBR) mirror, and air gap. We develop a method to evaluate the uncertainty in absorptance due to the uncontrollable parameter of air-gap distance. The validity of the simulation method is tested by comparison to an experimental realization for a case of single-layer ARC, which results in good agreement. We show finally a double-layer ARC design optimized for a system detection efficiency of higher than 95%, with a reduced uncertainty due to the air-gap distance.

  • https://doi.org/10.3807/COPP.2021.5.4.375 인용 PDF KSCI