Organic Gas Response Characteristics for Horizontal Direction of Fatty Acid LB Ultra-thin Films

지방산 LB초박막의 수평방향에 대한 유기가스 반응특성

  • 이준호 (동아대 화학공학과 연구원) ;
  • 최용성 (동아대 전기공학과 연구원) ;
  • 김도균 (동아대 전기공학과) ;
  • 권영수 (동아대 전기전자컴퓨터공학부)
  • Published : 1999.05.01

Abstract

Langmuir-Blodgett(LB) films which have high ordered orientation and ordering structure are fabricated by LB method which deposit the ultra-thin films of organic materials at a molecular level. The electrical characteristics of stearic acid LB ultra-thin films for the horizontal direction were investigated to develop the gas sensor using LB ultra-thin films. The optimal deposition condition to deposit the LB ultra-thin films was obtained from $\pi-A$ isotherms and the deposition status of stearic acid LB ultra-thin films was verified by the measurement of deposition ratio, UV-absorbance, and electrical properties for LB ultra-thin films. The conductivity of stearic acid LB ultra-thin films for horizontal direction was about $10_{-8}[S/cm]$. The activation energy for LB ultra-thin films with respect to variation of temperature was about 1.0[eV], which was correspond to semiconductor material. The response characteristics for organic gas were confirmed by measuring the response time, recovery time, and reproducibility of the LB ultra-thin to each organic gas. Also, the penetration and adsorption behavior of gas molecule were confirmed through the organic gas response characteristics of LB ultra-thin films with respect to temperature.

Keywords

Stearic acid;LB method;I-V characteristic;Conductivity

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