| Title |
A study on the {NO}_{2} gas detection characteristics of the organic ultra-thin films (CuTBP, {Li}_{2}Pc, {C}_{22}Py(TCNQ), PAAS LB Films) |
| Authors |
김형석 ; 유병호 ; 조형근 ; 한영재 ; 김태완 ; 김정수 |
| Keywords |
{NO}_{2} 가스 탐지 특성 ; LB막 ; 표면압-면적 등온선 ; 타원 분광 해석기 ; 자외-가기선 흡수 스팩트럼 {NO}_{2} Gas-detection Characteristics ; langmuir-Blodgett Films ; π-A Isotherms ; Ellipsometry ; UV/Visible Absortion Spectra |
| Abstract |
The N O_{2} gas-detection characteristics were investigated using the functional organic Langmuir-Blodgett (LB) films of Copper-tetra-tert-butylphthalocyanine (CuTBP), Dilithium phthalocyanine (Li_{2}Pc), N-docosylpyridinium TCNQ(C_{22}Py(TCNQ)), Polyamic acid alkylamine salts (PAAS). The optimum conditions for a film deposition were obtained through a study of .pi.-.ALPHA. isotherms and the deposited film status was confirmed by electrical and optical methods such as UV/visible absortion spectra, thickness measurements by ellipsometry, and electrical capacitances. A response of the LB films to the N O_{2} gas was measured by a change of the electrical conductivities when the film is exposed to the gases. The CuTBP LB film shows the biggest change of the electrical conductivities when it is exposed to the N O_{2} gases. And the order of gas-detection performance is the following;Li_{2}Pc, C_{22}Py(TCNQ), and PAAS LB films. Especially, the CuTBP and Li_{2}Pc LB films not only show the bigger change in the electircal conductivities when exposed to the gas, but return to the original state when the gas is desorbed.d. |