| Title |
Organic Gas Response Characteristics for Horizontal Direction of Fatty Acid LB Ultra-thin Films |
| Authors |
이준호(Lee, Jun-Ho) ; 최용성(Choe, Yong-Seong) ; 김도균(Kim, Do-Gyun) ; 권영수(Gwon, Yeong-Su) |
| Keywords |
Stearic acid ; LB method ; I-V characteristic ; Conductivity |
| 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 π-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. |