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Sol - Gel 법에 의한 TiO2 - V2O5 박막형 습도센서
이덕출,유도현 ( D . C . Lee,D . H . You ) 한국센서학회 1995 센서학회지 Vol.4 No.3
In this paper, TiO₂-V₂SO_5 humidity sensors are fabricated by Sol-Gel method. For the establishment of optimum processing condition which is good humidity sensitive characteristics for specimens, their microstructures and crystalline-structures are analysed. Grain size increases with substitution rate of V^(5+) on Ti^(4+) site. From the analysis of XRD, V^(5+) peak can`t confirm with V₂SO_5 rate. Their humidity sensitive characteristics is good at 1mol% of V₂O_5 rate and heat-treated at 700℃. The capacitance of specimens decreases with frequency.
$M_1-P-M_2$형 접촉으로 인하여 생기는 단락전류
이덕출,D C. Lee 대한전기학회 1976 전기의 세계 Vol.25 No.1
The main purpose of this paper is to study on the transient current due to the change of environmental temperature under no external field in the arrangement of M$_{1}$(metal)-P(polyver)-M$_{2}$(metal). The specimer of polymeric insulator sandwiched by two metal electrodes composes a parallel-plate condenser represented by Maxwell-model. The behaviors of short circuit current flowing in M-P-M arrangement are very complex and the analysis of its conduction mechanism appears to be much complicated. In this paper we can suggest that a contact potential difference as an energetic state exists in the thin film specimen both sides of which are contacted by two different metals having different cook functions. Futhermore the contact potential difference appears to be constant through the course of temperature change, however, the dielectric constant and caparitance of the specimen must be temperature dependent. Accordingly the charge difference induced on both sides of electrodes may be a cause for the shory circuited transient current flowing through the external circuit. It is also suggestive that the results of the observation must be considered in cases of insulation design of electrical machines and D.C. cable for high voltage use.
오위(AO WEI),신백균(P.-K. SHIN),송창호,박구범(G.-B. Park),유도현(D.-H. Yu),이선우(Sunwoo Lee),이붕주(B.-J. Lee),이덕출(D.-C. LEE) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Recently poly styrene (PPS) and poly vinyl acetate (PVA) are being investigated as a gate insulator for organic thin film transistors(OTFTs), because their dielectric constant for PVA and PPS is high enough to be used for gate insulator in the OTFT device. We report characteristics of single layer dielectric constant for PPS and PVA, and double layer of PPS/PVA prepared by different plasma power. Composition and electrical properties of the plasma polymerized insulating layer were investigated by FT-IR, I-V, and C-V measurements. Influence of the preparation condition on the resulting plasma polymerized thin films were discussed.