• 한국재료학회지
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• 제23권2호
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• pp.81-88
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• 2013

In this study, using a tin chloride solution as the raw material, a nano-sized tin oxide powder with an average particle size below 50 nm is generated by a spray pyrolysis process. The properties of the tin oxide powder according to the nozzle tip size are examined. Along with an increase in the nozzle tip size from 1 mm to 5 mm, the generated particles that appear in the shape of droplets maintain an average particle size of 30 nm. When the nozzle tip size increases from 1 mm to 2 mm, the average size of the generated particles is around 80-100 nm, and the ratio of the independent particles with a compact surface structure increases significantly. When the nozzle tip size is at 3 mm, the majority of the generated particles maintain the droplet shape, the average size of the droplet-shaped particles increases remarkably compared to the cases of other nozzle tip sizes, and the particle size distribution also becomes extremely irregular. When the nozzle tip size is at 5 mm, the ratio of droplet-shaped particles decreases significantly and most of the generated particles are independent ones with incompact surface structures. Along with an increase in the nozzle tip size from 1 mm to 3 mm, the XRD peak intensity increases, whereas the specific surface area decreases greatly. When the nozzle tip size increases up to 5 mm, the XRD peak intensity decreases significantly, while the specific surface area increases remarkably.

• Journal of Advanced Marine Engineering and Technology
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• 제40권4호
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• pp.325-329
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• 2016

본 연구에서는 Indium-Tin-Oxide 인쇄 박막의 원격 검출이 가능한 해양오염 방제용 센서로서의 응용 가능성에 대해 연구하였다. 우선 양질의 박막제작을 위한 바인더 비율, Indium-Tin-Oxide 중 주석 농도, 열처리 온도 등의 Indium-Tin-Oxide 인쇄박막 제작 조건을 최적화시켰다. 이를 이용하여 전기저항형 액체 센서를 제작하였고, 센서 동작을 확인하기 위하여 대기 중과 해수 중에서 저항 변화를 확인하였다. 이때 저항 변화의 원인은 전해질 속에서 표면에서 일어나는 환원반응에 의한 것으로 해석하였다. 또한 제작된 센서를 Arduino를 사용하여 작동시키고 취득한 데이터의 원격 검출이 가능함을 확인하였다.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2009년도 추계학술대회 초록집
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• pp.197-197
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• 2009

Indium tin oxide (ITO), Indium zinc oxide (IZO) 박막은 DC 마그네트론 스퍼터링 시스템을 이용하여 유리기판 위에 증착되었으며, Indium-zinc-tin oxide (IZTO) 박막은 두 개의 캐소드(DC, RF)를 사용한 마그네트론 이원동시방전 시스템에 의해 증착되었다. 모든 박막은 상온 증착 후 $200^{\circ}C$에서 후열처리 되었으며, IZO에 Sn이 소량 첨가됨에 따라 IZO보다 더 낮은 비저항을 갖는 것을 확인할 수 있었다.

• 한국응용과학기술학회지
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• 제31권4호
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• pp.694-702
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• 2014

마이크론 크기를 가지는 ITO(indium tin oxide) 입자들은 인듐과 틴의 수용성 전구체들과 유기 첨가제를 분무 열분해하여 얻었다. 유기 첨가제로서는 에틸렌글리콜과 시트르산을 이용하였다. 분무 열분해 시 에틸렌글리콜과 시트르산과 같은 유기첨가제를 첨가하지 않고 얻어진 ITO 입자들은 구형이며 속이 꽉찬 형태를 가지는데 비해 유기 첨가제를 첨가하여 분무 열분해를 하면 얻어지는 ITO 입자들은 유기 첨가제의 양이 증가 할수록 껍질이 얇고 다공성이 증대된 중공 입자가 얻어진다. 유기첨가제를 첨가하지 않고 분무 열분해를 통해 얻어지는 마이크론 크기를 가지는 ITO는 $700^{\circ}C$에서 두 시간 동안의 후소성과 24 시간동안의 습식 볼밀링에 의해 나노 크기의 ITO로 전환되지 않으나, 유기첨가제를 첨가하고 분무 열분해를 통해 얻어지는 마이크론 크기를 가지는 ITO는 $700^{\circ}C$에서 두 시간 동안의 후소성과 24 시간 동안의 습식 볼밀링에 의해 나노 크기의 ITO로 쉽게 전환되었다. 응집된 나노 크기의 ITO의 일차 입자의 크기를 Debye-Scherrer 식에 의해 계산하였고 ITO 입자를 압축하여 만든 펠렛의 표면저항을 측정하였다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제54권1호
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• pp.8-12
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• 2005

Indium tin oxide(ITO) surface treated by Oxygen plasma has been in situ analyzed using XPS(X-ray Photoelectron Spectroscopy) and EDS(Energy Dispersive Spectroscopy), to investigate the relations between the properties of the ITO surface and the properties of OLED(Organic Light Emitting Diode). We measured electrical resistivity using Four-Point-Probe and calculated sheet resistance, and ITO surface roughness was measured by AFM(Atomic Force Microscope). We fabricated OLED using substrate that was treated optimum ITO surface. The plasma treatment of the ITO surface lowered the operating voltage of the OLED. We have obtained an improvement of luminance and decrease of turn-on voltage.

• Transactions on Electrical and Electronic Materials
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• 제7권5호
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• pp.267-270
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• 2006

The Indium tin oxide (ITO) films were deposited on CR39 substrate using DC magnetron sputtering. ITO thin films deposited at room temperature because CR39 substrates its glass-transition temperature of is $130^{\circ}C$. ITO thin films used bottom and top electrode and for organic thin film transparent transistor.(OTFT) ITO thin film electrodes electrical properties and optical transparency properties in the visible wavelength range (300 - 800 nm) strongly dependent on volume of oxygen percent. For the optimum resistivity and transparency of ITO thin film electrode achieved with a 75 W plasma power, 10 % volume of oxygen and a 27 nm/min deposition rate. Above 85 % transparency in the visible wavelength range (300 - 800 nm) measured without post annealing process and $9.83{times}10{-4}{\Omega}cm$ a low resistivity was measured thickness of 300 nm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1477-1478
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• 2011

Solution processed zinc tin oxide (ZTO) thin films were studied using a spin coating for the fabrication of thin film transistors and simple circuits. The solution processed thin film transistors (W/L = 100/10 ${\mu}m$) have the average saturation mobility of 1.9 $cm^2$/Vs, threshold voltage of 20 V, and subthreshold slope of 0.5 V/decade. The dc characteristics of an inverter with $W_{load}=100\;{\mu}m$ and $W_{drive}=10\;{\mu}m$, measured under votage supply of $V_{DD}$ = +50 V. The inverter beta ratio is 20 ($R=(W_{drived}/L_{drive})/(W_{load}/L_{load})=20$) and $gain_{max}$ is 2. The characteristics of an oscillator were measured under voltage supply of $V_{DD}$ = +60 V.

• 전기학회논문지
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• 제56권3호
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• pp.561-565
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• 2007

We propose glass and PDMS (polydimethylsiloxane) chips for DNA amplification with continuous-flow PCR (polymerase chain reaction). The PDMS microchannel was fabricated using a negative molding method for sample injection. Three heaters and sensors of ITO (indium-tin-oxide) thin films were fabricated on glass chip. ITO heaters and sensors were calibrated accurately for the temperature control of the liquid flow. ITO heater generated stable heat versus applied power. ITO sensor resistance was changed linearly versus temperature increase as a RTD (resistance temperature detector) sensor. As a result, we enable precision temperature control of continuous-flow PCR chip. Using the continuous-flow PCR chip DNA plasmid pKS-GFP 720 bp was successfully amplified.

• Bulletin of the Korean Chemical Society
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• 제28권7호
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• pp.1171-1174
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• 2007

We have developed an electrochemical immunosensor that combines the electrocatalytic property of carbon nanotube and the low background current of indium tin oxide (ITO) electrode. A partial monolayer of carboxylated single-walled carbon nanotube (CCNT) is covalently formed on an ITO electrode modified with amine-terminated phosphonic acid. Nonspecifically adsorbed avidin on the hydrophobic sidewalls of CCNT is used to immobilize biotinylated antibody and to reduce the nonspecific binding to CCNT. The biotinylated antimouse IgG bound on avidin and the antimouse IgG conjugated with alkaline phosphatase (ALP) sandwiches a target mouse IgG. ALP catalyzes the conversion of p-aminophenyl phosphate monohydrate into p-aminophenol, which is electrocatalytically oxidized to p-quinone imine on CCNT surface. Moderate electrocatalytic electrode obtained with the combination of CCNT and ITO allows low detection limit (0.1 ng/ mL).

• Transactions on Electrical and Electronic Materials
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• 제16권1호
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• pp.5-9
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• 2015

Optical and electrical properties were studied for Antimony doped tin oxide thin films from precursors containing 10, 30, 50, and 70 atom% of Sb deposited on bare sodalime silica, barrier layer coated sodalime silica, and pure silica glass substrates by sol-gel spinning technique. The direct band gaps were found to vary from 3.13~4.12 eV when measured in the hv range of 2.5~5.0 eV, and varied from 4.22~5.08 eV when measured in the range of 4.0~7.0 eV. Indirect band gap values were in the range of 2.35~3.11 eV. Blue shift of band gap with respect to bulk band gap and Moss-Burstein shift were observed. Physical thickness of the films decreased with the increase in % Sb. Resistivity of the films deposited on SLS substrate was in the order of $10^{-2}$ ohm cm. Sheet resistance of the films deposited on barrier layer coated soda lime silica glass substrate was found to be relatively less.