• E2M - 전기 전자와 첨단 소재
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• 제10권3호
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• pp.233-238
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• 1997

We have investigated gas-detection characteristics of CuTBP (Copper-tetra-tert-butylphthalocyanine) chemiresistor devices exposed to air/200ppm N $O_{2}$ gases. The CuTBP films were made by Langmuir-Blodgett (LB) techniques. Sensitivity, response time, recovery time, and reproducibility of the devices were measured by current voltage characteristics. Interdigital electrode was used to improve the sensitivity. It was observed that a conductance G increases monotonically as the number of interdigital electrode finger pairs increases. As the number of interdigital electrode finger pairs increases, the sensitivity S( $G_{gas}$/ $G_{air}$) increases more than 50 times and stable. But the response time was delayed. The average recovery time of the CuTBP chemiresistor devices turned out to be about 100 second. We have also investigated applicability of the CuTBP chemiresistor device for a gas sensor.sor.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1713-1715
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• 1996

The $NO_2$ GAS Sensitivity characteristic of CuTBP(Copper-tetra-tert-butylphthalocyanine) LB films were investigated through a study of current-voltage (I-V) characteristics with a variation of number of electrode finger pairs N ($1{\sim}25$). A concentration of 200ppm $NO_2$ gas was used. It was found that a conductance G increases monotonically as the number of interdigital electrode increases, and a Sensitivity, Reproducibility is stable. As far as a current is concerned, the current when N=25 is greater than that when N=1 by 70 or so. It indicates that the number of interdigital electrodes affects the current, sensitivity and stability. We knew that the $NO_2$ gas detector application possibility using a current of N=25.

• 전기학회논문지P
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• 제55권1호
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• pp.26-30
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• 2006

For the purpose of developing capacitive humidity sensor having interdigital electrodes, interdigital electrode was modeled and simulated to obtain capacitance and sensitivity as a function of geometric parameters like the structural gap and thickness. For the development of ASIC, switched capacitor signal processing circuits for capacitive humidity sensor were designed and simulated by Cadence using $0.25{\mu}m$ CMOS process parameters. The signal processing circuits are composed of amplifier for voltage gain control, and clock generator for sensor driving and switch control. The characteristics of the fabricated sensors are; 1) sensitivity is 9fF/%R.H., 2) temperature coefficient of offset(TCO) is $0.4%R.H./^{\circ}C$, 3) nonlinearity is 1.2%FS, 4) hysteresis is 1.5%FS in humidity range of $3%R.H.{\sim}98%R.H.$. The response time is 50 seconds in adsorption and 70 seconds in desorption. Fabricated process used in this capacitive humidity sensor having interdigital electrode are just as similar as conventional IC process technology. Therefore this can be easily mass produced with low cost, simple circuit and utilized in many applications for both industrial and environmental measurement and control system, such as monitoring system of environment, automobile, displayer, IC process room, and laboratory etc.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.680-683
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• 1997

In this paper, the multilayer actuator is investigated by using the finite element method. The material is taken to be piezoelectric. The capacitor and interdigital wlfloating type actuator are compared to the stress field distribution under the uniform electric field. As the length of the floating electrode in the interdigital wlfloating actuator changes, the stress field around the edge of electrode is studied.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.417-420
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• 1996

We have investigated air/200ppm NO$_2$ gas-detector characteristics of using CuTBP (Copper-tetra-tert-butylphthalocyanine) chemiresistor devices. The CuTBP films were made by Langmuir-Blodgett (LB) techniques. Sensitivity, response time, recovery time, and repoducibility of the devices were measured by current-voltage characteristics. To increase sensitivity, interdigital electrode was used. It was found that a conductance G increases monotonically as the number of interdigital electrode increases, and a Sensitivity, Reproducibility is stable. As far as a current is concerned, the current when N=25 is greater than that when N=1 by 70 or so. It indicates that the number of interdigital electrodes affects the current, sensitivity and stability We have also investigated applicability of the CuTBP chemiresistor device for a gas detector.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.140-144
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• 2003

To investigate failure analysis of surface acoustic wave (SAW) filter for radio frequency, high temperature storage test was carried out. The failure criteria were insertion loss at passband and rejection level at stopband. As a result, the insertion loss at passband increase about 4 dB was due to damages of interdigital transducer (IDT). That is caused by poor adhesion between metal electrode(AI) and piezoelectric substrate and defects on a manufacturing process. This result indicates that good adhesion between electrode and ceramic substrate is important factor And also we investigated the demage factors of electrode. Screen possible of saw filter using high temperature storage test(HTOL) in the manufacturing phase be presented.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 춘계학술대회 논문집
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• pp.6.2-8
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• 1996

The NO$_2$ GAS-detection characteristic of CuTBT (Copper-tetra-tert-butylphtha1ocyanine) LB films were investigated through a study of current-voltage (I-V) characteristics with a variation of number N of interdigital electrodes (N=1∼25). A concentration of 200ppm NO$_2$ gas was used. It was found that a conductance G increases monotonically as the number of interdigital electrode increases, and a sensitivity $\Delta$G ($\Delta$G=G$\_$gas//G$\_$air/) is at least higher than 50 and stable. As far as a sensitivity is concerned, the sensitivity when N=26 is greater than that when N=1 by 70 or so. It indicates that the number of interdigital electrodes affects the currents, sensitivity and stability.

• 한국정보통신학회논문지
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• 제14권3호
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• pp.699-706
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• 2010

경사진 빗살무늬 변환기 필터를 제작하기 위하여 Langasite 기판위에 두 가지 형태의 빗살무늬 변환기를 형성시켰으며, 전극재료로는 Al-Cu를 사용하였다. 모의실험을 바탕으로 입력단에는 IDT를 직렬형태로 연결시킨 block 형태로 하중을 가하는 전극 방법을 쓰고 출력단은 withdrawal 형태로 하중을 가하는 방법을 써서 제작하였다. 이를 바탕으로 경사진 빗살무늬 변환기 필터 전극 설계 방식에 대한 적절한 위상조건도 얻고자 시도하였다. Langasite 기판위에 형성시킨 입출력 빗살무늬 변환기 전극수는 50쌍, 두께는 $5000\;{\AA}$으로 하였으며, 반사기 폭은 $3.6{\mu}m$으로 하였다. 첫 번째 시료에서 hot전극과 반사기사이의 거리는 $2.4{\mu}m$이고, 접지 전극과 반사기사이의 거리는 $1.8{\mu}m$이며, hot전극에서부터 접지전극까지 간격은 $1.5{\mu}m$로 제작하였다. 두 번째 시료는 hot전극과 반사기사이의 거리 및 접지 전극과 반사가사이의 거리를 $2.4{\mu}m$로 동일하게 제작하였다. 제작한 필터의 주파수 특성은 중심주파수가 대략 190MHz정도, 대역폭은 7.3MHz이하로 측정되었으며, matching 후 return loss는 -20dB 이하이고, 리플 특성은 3dB정도이며, 반사에 의한 잔향은 -22dB 이하로 측정되었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.625-628
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• 2009

In the bistable chiral splay nematic (BCSN) mode, the splay and ${\pi}$ twist states are used for the two stable states. The switching property is strongly dependent on the amplitude of the electric field. In this paper, we investigated the gray scale capability of BCSN liquid crystal display (LCD) by the gradual horizontal electric field caused the interdigital electrode of by the inequality gap. We demonstrate the gray scale of the BCSN LCD during transition process under the horizontal electric field.

• 한국전자파학회논문지
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• 제26권12호
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• pp.1064-1071
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• 2015

본 논문에서는 마이크로대역에서 단층 및 다층 그래핀이 각각 결합된 인터디지털 커패시터의 전기적 특성을 비교 분석하였다. 그래핀이 결합된 커패시터의 등가회로에서 커패시터의 저항, 인덕턴스, 커패시턴스 성분들 간 차이가 분명하게 나타났다. 특히 단층 그래핀이 결합된 커패시터의 경우, 순수 커패시터와 다층 그래핀이 결합된 커패시터에 비해 추가적으로 인덕턴스와 저항 성분이 나타났고, 또한, 커패시터 전극의 저항 성분이 증가하였다. 한편, 커패시터의 자기공명주파수는 더 낮은 주파수대역으로 이동하였고, 0.5~4 GHz 주파수 대역에서 투과특성이 상당히 향상되었다. 반면, 다층 그래핀이 결합된 커패시터의 경우, 순수한 커패시터의 전기적 특성과 약간의 차이만 나타났다. 결과적으로 본 연구를 통해서 단층 그래핀이 다층 그래핀에 비해 인터디지털 커패시터의 전기적 특성과 성능에 더욱 민감한 영향을 줄 수 있음을 확인하였다.