• 한국재료학회:학술대회논문집
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• 한국재료학회 1992년도 춘계학술발표회
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• pp.119-120
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• 1992

• 한국산학기술학회논문지
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• 제22권2호
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• pp.644-650
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• 2021

본 연구는 지구 온난화의 주요 원인인 이산화탄소를 이용하여 메탄의 개질반응 특성을 수행하였다. 이산화탄소와의 메탄 분해 반응을 전이금속 촉매인 주석을 사용하여 수행되었으며, 주석의 분해 반응성은 니켈, 철과 같은 전이 금속보다 낮으며, 대부분의 분해 반응은 고체 상태 촉매하에 수행된다. 반면에 주석의 녹는점은 505.03K로 액상 촉매하에서 분해가 발생된다. 주석을 사용하는 경우 액상으로 반응하며 메탄이 분해되어 생성되는 고체상 탄소가 촉매에 침적되어 비활성화되는 것을 것을 방지하는 장점이 있다. 이산화탄소를 사용하여 메탄을 분해하는 경우 일산화탄소와 수소를 생성한다. 촉매의 활성과 수명을 높이기 위해 Ni를 사용한 경우 촉매 활성이 향상되었다. 본 연구에서는 과잉습식함침법을 이용하여 촉매를 합성하였으며, 반응 온도, 공간 속도에 따른 활성과 촉매 재생 가능성을 타진하였다. 탄소가 침적된 주석의 촉매 재생 온도는 1023 K로 나타났으며, 니켈을 조촉매로 사용하고 물을 공급하므로써 반응성이 향상되는 것으로 나타났다.

• 한국분말재료학회지
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• 제24권5호
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• pp.351-356
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• 2017

Tin dioxide nanoparticles are prepared using a newly developed synthesis method of plasma-assisted electrolysis. A high voltage is applied to the tin metal plate to apply a high pressure and temperature to the synthesized oxide layer on the metal surface, producing nanoparticles in a low concentration of sulfuric acid. The particle size, morphology, and size distribution is controlled by the concentration of electrolytes and frequency of the power supply. The as-prepared powder of tin dioxide nanoparticles is used to fabricate a gas sensor to investigate the potential application. The particle-based gas sensor exhibits a short response and recovery time. There is sensitivity to the reduction gas for the gas flowing at rates of 50, 250, and 500 ppm of $H_2S$ gas.

• 한국재료학회지
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• 제13권7호
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• pp.442-446
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• 2003

Tin dioxide ($SnO _2$) thin films were deposited at $375^{\circ}C$ on alumina substrate by metal-organic chemical vapor deposition. A few hillocks like a cauliflower were observed and the number of hillock on thin film surface increased with annealing temperature in air atmosphere. The oxygen content and the binding energy during air annealing at$ 500^{\circ}C$ came to close the stoichiometric $SnO_2$. The cauliflower hillocks seem to be the result of the continuous migration of the tiny grains to release the stress of an expanded grain. Sensitivity of CO gas depended on annealing temperature and increased with increasing annealing temperature.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 센서 박막재료 반도체 세라믹
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• pp.99-102
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• 2003

Tin dioxide thin films were deposited at $375^{\circ}C$ on alumina substrate by metal-organic chemical vapor deposition process to find the relationship between physicochemical properties and the annealing treatments. The small grains with heat treatments grew to the bunch of grains and then showed the hillocks on the film surface. The thickness decreased with annealing treatment. The measured binding energy (BE) and branching ratio of the Sn 3d spin-orbital doublet were typical of oxidized states of Sn and the BE of the O1s core level of about 530~530.65eV also confirmed the presence of O-Sn bonds. The BE of oxygen and tin with annealing treatment shifted to higher position. O/Sn atomic ratios of films deposited at $375^{\circ}C$ for 2min and 4min were 1.99 and 2.01, respectively. The value of the atomic ratio O/Sn of films deposited at $375^{\circ}C$ for 2min changed from 1.99 to 2.45 with annealing treatment. Gas sensitivity depended on annealing temperature, the sensitivity increased with increasing annealing temperature.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.250-251
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• 2005

Tin dioxide (SnO$_2$) thin films have been prepared on Si wafer (100) by Plasma Enhanced Chemical Vapor Deposition (PECVD). SnO$_2$ thin films were prepared from mixtures of dibutyltin diacetate as a precursor, oxygen as an oxidant at 275, 325, 375, 425$^{\circ}C$, respectively. The microstructure of deposited films was characterized by X-ray diffraction and field emission scanning electron microscopy. Structural characteristics of prepared SnO$_2$ thin films were investigated with different substrate temperature. The deposition rate was linearly increased with substrate temperature. Surface morphology and uniformity of prepared thin film was excellent at 375$^{\circ}C$ and grain size was averagely 25nm.

• 한국산학기술학회논문지
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• 제19권10호
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• pp.1-7
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• 2018

이산화주석은 리튬 이온 전지의 Anode 전극물질, 또는 $H_2$, NO, $NO_2$ 등의 가스 분자가 표면에 흡착되면 전기저항이 변하는 특성을 이용하여 가스센서로 활용되고 있으며, 나노구조를 갖는 이산화주석의 합성과 관련하여 많은 연구가 활발하게 이루어지고 있다. 나노구조물의 경우 Bulk 상태보다 체적 대비 표면적비가 높기 때문에 기체분자의 흡착확률을 높일 수 있으므로 고감도 가스 센서의 구현이 가능하고, Li-ion 이차전지의 경우에도 비정전용량을 향상시킬 수 있다. 본 연구에서는 열화학기상증착 장비를 이용하여 기상수송방법으로 $SnO_2$ 나노구조물을 Si 기판 위에 직접 성장시켰다. 이때 이송가스로 이용되는 고순도 Ar 가스에 고순도 산소가스를 혼합하였고, 산소가스의 혼합량에 따라 다른 형태의 산화주석 나노구조물이 성장되는 것을 확인하였다. 기상수송방법으로 성장된 산화주석 나노구조물의 결정학적 특성은 Raman 분광학 및 XRD 분석을 통하여 확인하였고, 표면형상을 주사전자현미경을 통하여 확인하였다. 분석결과 산화주석 나노구조물은 산소가스 혼합량에 민감하게 영향을 받았으며, 이송가스로 이용되는 고순도 Ar 1000 SCCM에 고순도 산소가스 10 SCCM을 혼합하였을 때, 적당한 두께를 가지면서 Nanodots 형태의 표면형상을 갖는 $SnO_2$ 결정상의 나노구조물이 성장되는 것을 확인하였다.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1993년도 춘계학술발표회
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• pp.39-40
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• 1993

• 열처리공학회지
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• 제26권4호
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• pp.173-177
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• 2013

Separation and recovery of valuable metals such as zinc, nickel or tin from copper alloy dross has recently attracted from the viewpoints of environmental protection and resource recycling. In this report, preliminary study on concentration and separation of tin from copper alloy dross using selective dissolution method was performed. The tin in the copper alloy dross did not dissolve in the nitric acid solution which could allow the concentration and separation of the tin from the copper alloy dross. Precipitation of tin as $H_2SnO_3$ (metastannic acid) occurred in the solution and transformed to tin dioxide ($SnO_2$) after drying process. The dried sample was heat-treated at low temperature and its phase characteristics, surface morphology and chemical composition were investigated.

• 한국결정성장학회지
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• 제24권2호
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• pp.84-87
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• 2014

Separation/recovery of valuable metals such as zinc, nickel or tin from copper alloy dross has recently attracted from the viewpoints of environmental protection and resource recycling. In this study, preliminary investigation on separation of tin (Sn) from copper alloy dross using selective dissolution method was performed. The tin in the copper alloy dross did not dissolve in an aqueous nitric acid solution which could allow the concentration/separation of tin from the copper alloy dross. Precipitation of tin as $H_2SnO_3$ (meta stannic acid)occurred in the solution and transformed to tin dioxide ($SnO_2$) after drying process. The dried sample was heat-treated at low temperature and its crystal structure, surface morphology and chemical composition were investigated.