• 한국전기전자재료학회논문지
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• 제35권4호
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• pp.392-397
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• 2022

We present the structural and optical properties of Au@TiO₂ core-shell microsphere structure prepared by a hydrothermal synthesis method. As a way to improve the efficiency of organic solar cells, the Au@TiO₂ core-shell microsphere was synthesized to use the local surface plasmon resonance (LSPR) phenomenon. The synthesized results were confirmed to have the Au@TiO₂ core-shell structure using a high-resolution transmission electron microscopy. An absorption was observed to occur at 527 nm belonging to the visible light region using a visible light spectroscopy, which supports the LSPR phenomenon. We suggest that the Au@TiO₂ core-shell microsphere is highly likely to be applied to organic solar cells including dye-sensitized solar cells. In addition, we expect it to be widely used not only in the energy but also in the bio as well as in the environmental fields.

• 한국초전도ㆍ저온공학회논문지
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• 제24권4호
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• pp.6-10
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• 2022

We report on the fabrication and measurements of metallic Josephson junctions (JJs) consisting of Au nanoribbon and NbTi superconducting electrodes. The maximum supercurrent density in the junction reaches up to ~ 3×10⁵ A/cm² at 2.5 K, much larger than that of JJ using single-crystalline Au nanowire. Temperature dependence of the critical current exhibits an exponential decay behavior with increasing temperature, which is consistent with a long and diffusive junction limit. Under the application of a magnetic field, monotonous decrease of the critical current was observed due to a narrow width of the Au nanoribbon. Our observatons suggest that NbTi/Au/NbTi JJ would be a useful platform to develop an integrated superconducing quantum circuit combined with the superconducting coplanar waveguide and ferromagnetic π junctions.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1998년도 추계학술발표강연 및 논문개요집
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• pp.152-152
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• 1998

• 한국재료학회:학술대회논문집
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• 한국재료학회 2003년도 추계학술발표강연 및 논문개요집
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• pp.29-29
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• 2003

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제36회 동계학술대회 초록집
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• pp.157-157
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• 2009

• 한국재료학회지
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• 제16권10호
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• pp.629-632
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• 2006

Electrical characteristics of Pt/Ti/Pt/Au and Pd/Zn/Pd/Au contacts to p-type InGaAs grown on an InP substrate have been characterized as a function of the doping concentration and the annealing temperature. The Pt/Ti/Pt/Au contacts produced the specific contact resistance as low as $2.3{\times}10^{-6}{\Omega}{\cdot}cm^2$, when heat-treated at an annealing temperature of $400^{\circ}C$. Comparison of the Pt/Ti/Pt/Au and Ti/Pt/Au contacts showed that the first Pt layer plays an important role in reducing the contact resistivity probably by lowering energy barrier at the metal-semiconductor interface. For the Pd/Zn/Pd/Au contacts, the contact resistivity remained virtually unchanged with increasing annealing temperature. The specific contact resistivity as low as $4.7{\times}10^{-6}{\Omega}{\cdot}cm^2$ was obtained. The results indicate that the Pt/Ti/Pt/Au and Pd/Zn/Pd/Au schemes could be potentially important for the fabrication of InP-based optoelectronic devices, such as photodetector and optical modulator.

• 한국세라믹학회지
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• 제43권2호
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• pp.114-120
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• 2006

Nano-size Au particle doped $TiO_2$ films were prepared with $Ti(OC_3H_7^i)_4$, polyvinylpyrrolidone(PVP), $HAuCl_4$ and $C_3H_7OH$ etc. by sol-gel method. $TiO_2$ gel films were obtained by the dip-coating method on the $SiO_2$ glass substrates, and then heat-treated at $700^{\circ}C$ for 10 min. The thickness of $TiO_2$ films were $0.7\~1.8\;{\mu}m$. It was found that the thickness of films prepared from PVP containing solution was about $2\~8$ times higher values than that of thin films without PVP. The size of Au particles doped in the films were about $350\~750\;nm$. Nano-size Au particle dispersed $TiO_2$ films showed high absorption peak at visible region 450nm, which made them good candidates for non-linear optical materials and photo-catalytic materials. The contact angle of $TiO_2$ film for water was $12.5^{\circ}$, and therefore it is clear that $TiO_2$ films have very high hydrophilic properties and the self-cleaning effects.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.370.2-370.2
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• 2014

본 연구에서는 Bending 시간에 따른 Ti/Au의 전기적 특성 변화에 대한 실험을 진행하였다. 전기적 특성을 평가하기 위해 PET 기판 위에 Ti/Au을 Greek Bridge와 Line Bridge를 합친 Cross Bridge 형태로 증착하였고, Cross Bridge의 Line을 bending하여 시간 경과에 따른 정적인(static) bending 영향을 확인하였다. Bending은 0~100시간까지 진행하였고, Line의 width를 200, 400, 800, $1000{\mu}m$로 가변하여 시간에 따른 비저항의 변화를 측정하였다. 실험결과 Bending시간이 길어짐에 따라 비저항이 감소하였고, 일정시간에서 크게 감소하며, 그 이후에는 포화되는 경향을 보였다. 또한 Width가 증가함에 따라 비저항의 변화가 컸다. 800 um, $1000{\mu}m$에서는 bending 직후 비저항이 초기대비 약 90%까지 떨어졌으며 100시간 후에는 80%까지 감소하였다. 100시간 뒤 Width에 따라 초기대비 비저항이 78%~91%까지 감소하는 것을 확인하였다.

• 한국표면공학회지
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• 제32권4호
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• pp.503-512
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• 1999

The crystal structure and the microstructure of the intermetallic compounds formed in the interface between In solder and Au/Ni/Ti thin films have been investigated by XRD, SEM, and TEM. Indium solder was deposited on the Au/Ni/Ti thin films/Si substrate by evaporation. The heat treatments simulated the flip chip solder joining were performed in RTA system or in furnace. $Auln_2$ phase is formed in all specimens.$ In_{27}$ $Ni_{10}$ and/or $In_{X}$ $Ni_{Y}$ phase are formed in the interface between $Auln_2$ and Ni depending the heat treatment conditions.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1995년도 추계 학술발표 강연 및 논문개요집
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• pp.97-97
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• 1995