• 제목/요약/키워드: Interfacial films

검색결과 251건 처리시간 0.034초

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/Graphene Oxide Nanocomposite Films: Thermomechanical Properties, Oxygen Transmission Rates, and Hydrolytic Degradation

  • You, Eun Jung;Ha, Chang-Sik;Kim, Gue-Hyun;Lee, Won-Ki
    • 한국환경과학회지
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    • 제26권1호
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    • pp.1-10
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    • 2017
  • In this study, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/graphene oxide (GO) nanocomposite films containing various content of GO were prepared using solution casting method. The effect of GO content on Young's modulus and dispersion of GO in PHBV matrix was investigated. Also, the thermomechanical properties, oxygen transmission rates and hydrolytic degradation of PHBV/GO nanocomposite films were studied. The addition of GO into PHBV improves the Young's modulus and decreases thermal expansion coefficient. The improvement can be mainly attributed to good dispersion of GO and interfacial interactions between PHBV and GO. Furthermore, PHBV/GO nanocomposite films show good oxygen barrier properties. PHBV/GO nanocomposites show lower hydrolytic degradation rates with increasing content of GO.

PET 필름의 전기적 특성에 미치는 계면효과 (The Effects of Interfacial on the Electrical Properties in PET Films)

  • 강무성;이창훈;박수길;박대희
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제48권5호
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    • pp.281-284
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    • 1999
  • In this paper, the electrical conduction, breakdown strength and dielectric properties were investigated in the interfaces of PET films. The volume resistivity and breakdown strength were decreased; especially the specimens with semiconductive layer showed the lowest breakdown strength. This decrease of electrical properties was appeared by increasing charge density in inhomogeneous layer of PET. The dielectric properties of PET did not show significant difference with PET/PET but the films with semiconductive interface layer showed the increase in capacitance and $tan\delta$ was affected by the PET rather than semiconductive layer. It is assumed that the variation of $tan\delta$ was affected by the dielectric polarization and the leakage current(charge).

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단결정 SOI트랜스듀서 및 회로를 위한 Si직접접합 (Silicon-Wafer Direct Bonding for Single-Crystal Silicon-on-Insulator Transducers and Circuits)

  • 정귀상
    • 센서학회지
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    • 제1권2호
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    • pp.131-145
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    • 1992
  • 본 논문은 SOI트랜스듀서 및 회로를 위해, Si 직접접합과 M-C국부연마법에 의한 박막SOI구조의 형성 공정을 기술한다. 또한, 이러한 박막SOI의 전기적 및 압저항효과 특성들을 SOI MOSFET와 cantilever빔으로 각각 조사했으며, bulk Si에 상당한다는 것이 확인되었다. 한편, SOI구조를 이용한 두 종류의 압력트랜스듀서를 제작 및 평가했다. SOI구조의 절연층을 압저항의 유전체분리층으로 이용한 압력트랜스듀서의 경우, $-20^{\circ}C$에서 $350^{\circ}C$의 온도범위에 있어서 감도 및 offset전압의 변화는 자각 -0.2% 및 +0.15%이하였다. 한편, 절연층을 etch-stop막으로 이용한 압력트랜스듀서에 있어서의 감도변화를 ${\pm}2.3%$의 표준편차 이내로 제어할 수 있다. 이러한 결과들로부터 개발된 SDB공정으로 제작된 SOI구조는 집적화마이크로트랜스듀서 및 회로개발에 많은 장점을 제공할 것이다.

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증착조건 및 열처리조건에 따른 $ZrO_2$박막의 미세구조와 전기적 특성에 관한 연구 (A study of the microstructures and electrical properties of $ZrO_2$ thin film on Si(100))

  • 유정호;남석우;고대홍;오상호;박찬경
    • 한국진공학회지
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    • 제9권4호
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    • pp.341-345
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    • 2000
  • p형 Si (100)기판 위에 reactive DC magnetron sputtering으로 증착한 $ZrO_2$박막에 대하여 증착 조건과 열처리 조건에 따른 미세구조의 변화 및 전기적 특성 변화를 관찰하였다. 증착 및 열처리 온도가 증가하고 power 증가할수록 $ZrO_2$의 굴절율은 증가되어 이상적인 2.0~2.2에 근접하였다. 상온에서 증착된 $ZrO_2$ 박막은 비정질이며 $300^{\circ}C$에서 증착한 경우 $ZrO_2$박막은 다결정이었다. 산소 분위기에서 열처리를 수행한 박막의 RMS 값은 증착직후보다 높아지고 계면 산화막은 산소의 확산에 의해 두께가 증가하였다. A1/$ZrO_2$/p-type Si(100)의 C-V과 I-V 특성을 관찰하였고, 그 결과 산소분위기에서 열처리하는 경우 계면 산화막의 두께증가로 Cmax 및 누설전류가 감소함을 알 수 있었다.

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적외선 램프를 이용하여 소결한 구리 나노잉크의 전기적 특성 평가에 관한 연구 (Electrical Property Evaluation of Printed Copper Nano-Ink Annealed with Infrared-Lamp Rapid Thermal Process)

  • 한현숙;김창규;양승진;김윤현
    • 한국재료학회지
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    • 제26권4호
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    • pp.216-221
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    • 2016
  • A sintering process for copper based films using a rapid thermal process with infrared lamps is proposed to improve the electrical properties. Compared with films produced by conventional thermal sintering, the microstructure of the copper based films contained fewer internal and interfacial pores and larger grains after the rapid thermal process. This high-density microstructure is due to the high heating rate, which causes the abrupt decomposition of the organic shell at higher temperatures than is the case for the low heating rate; the high heating rate also induces densification of the copper based films. In order to confirm the effect of the rapid thermal process on copper nanoink, copper based films were prepared under varying of conditions such as the sintering temperature, time, and heating rate. As a result, the resistivity of the copper based films showed no significant changes at high temperature ($300^{\circ}C$) according to the sintering conditions. On the other hand, at low temperatures, the resistivity of the copper based films depended on the heating rate of the rapid thermal process.