휘발성 유기화합물 측정을 위한 전도성고분자 센서의 감응기구에 관한 연구

황하룡; 백지흠; 허증수; 이덕동; 임정옥; 이준영; H.R. Hwang; J.H. Paik; J.S. Huh; D.D. Lee; J.O. Lim; J.Y. Lee

Korean Journal of Materials Research, Vol.11, No.7, 599-602, July, 2001

Export Citation

휘발성 유기화합물 측정을 위한 전도성고분자 센서의 감응기구에 관한 연구

Studies on the Sensing Mechanism of Conducting Polymer for Volatile Organic Compound Sensing

황하룡, 백지흠, 허증수 , 이덕동¹, 임정옥², 이준영 ³

경북대학교 금속공학과
¹경북대학교 전자공학과
²경북대병원 의학연구소
³성균관대학교 섬유공학과

H.R. Hwang, J.H. Paik, J.S. Huh , D.D. Lee¹, J.O. Lim², and J.Y. Lee³

Departments of Metallurgical Engineering, Kyungpook National University, Korea
¹School of Electronic and Elctrical Engineering, Kyungpook National University, Korea
²Medical Research Institute, Kyunpook Hospital, Korea
³Textitle Engineering, Sungkyunkwan University, Korea

초록

전도성 고분자인 poupyrrole과 polyaniline을 이용하여 센서를 제조하고 휘발성 유기화합물에 대한감응특성 및 감지막의 물성을 조사하여 지금까지 알려지지 않은 감응 기구를 설명하고자 하였다. Polypyrrole과 polyaniline은 두께가 얇은 경우가 두꺼운 경우보다 감도가 높았으며, 1분간 도펀트를 제거한 센서가 가장 높은 감도를 나타내었다. 또한 두 가지 센서 모두 극성이 강한 분자가 흡착될수록 감도가 증가하였는데, 이는 극성을 갖는 분자가 감지막 내부로 침투하여 polaron 및 자유 carrier를 고착시키거나 추가의 자유 carrier를 형성하여 전도도에 변화를 주기 때문인 것으로 판단된다.

In this study, we fabricated chemically polymerized PPy and PANi films with different selectivity by controlling dedoping time. And the sensing properties and mechanism of VOCs adsorption to conducting polymers were investigated. Thin sensor had higher sensitivity compared to thick one, and dedoped sensor for 1-minute highest sensitivity. Upon gas absorption, polypyrrole exhibited positive sensitivity while polyaniline had negative sensitivity. PPy film show hydrophilic property and PANi film show hydrophobic property. After the gas absorption, the sensitivity increased as a function of polarity of absorbed molecules. These behaviors are due to the polar molecules absorbed with the movable polaron or free carrier, and then it interrupt or generate the movement of polaron and carrier, and then it changes the conductivity of polymer. We found that conducting polymer sensors are very sensitive to the difference in polarity of gas molecules.

Keywords:VOCs(volatile organic compounds);conducting polymer;sensing mechanism;polypyrrole;polyaniline;sensor

[References]

Bidan G, Sens. Actuators, 86, 45 (1992)
Slater JM, Watt EJ, Anal. Proc., 26, 397 (1989)
Shaolin M, Electrochem. Acta., 39, 9 (1994)
Shaolin M, Jinquing K, Jianbing Z, J. Electroanal. Chem., 334, 121 (1993)
Gardner JW, Bartlett PN, Sens. Actuators B, 18-19, 211 (1994)
Hwang BJ, Yang JY, Lin CW, J. Electrochem. Soc., 146(3), 1231 (1999)
Lee JY, Kim DY, Kim CY, Synth. Met., 74, 103 (1995)
Kim DY, Lee JY, Kim CY, Kang ET, Tan KL, Synth. Met., 72, 243 (1995)
Imisides MD, Jhon R, Wallace GG, Chemtech., 26(5), 19 (1996)
Avlyanov JK, Min T, MacDiarmid AG, Epstein AJ, Synth. Met., 72, 65 (1995)
Gardner JW, Bartlett PN, Electronic noses principles and applications, 80-81, Oxford University Press, New York, U.S., (1999) (1999)
De Olivia ZT Jr., Dos Santos MC, Solid State Commun., 49-53, 114 (2000)

[Related Articles]

[1] Bidan G, Sens. Actuators, 86, 45 (1992)

[2] Slater JM, Watt EJ, Anal. Proc., 26, 397 (1989)

[3] Shaolin M, Electrochem. Acta., 39, 9 (1994)

[4] Shaolin M, Jinquing K, Jianbing Z, J. Electroanal. Chem., 334, 121 (1993)

[5] Gardner JW, Bartlett PN, Sens. Actuators B, 18-19, 211 (1994)

[6] Hwang BJ, Yang JY, Lin CW, J. Electrochem. Soc., 146(3), 1231 (1999)

[7] Lee JY, Kim DY, Kim CY, Synth. Met., 74, 103 (1995)

[8] Kim DY, Lee JY, Kim CY, Kang ET, Tan KL, Synth. Met., 72, 243 (1995)

[9] Imisides MD, Jhon R, Wallace GG, Chemtech., 26(5), 19 (1996)

[10] Avlyanov JK, Min T, MacDiarmid AG, Epstein AJ, Synth. Met., 72, 65 (1995)

[11] Gardner JW, Bartlett PN, Electronic noses principles and applications, 80-81, Oxford University Press, New York, U.S., (1999) (1999)

[12] De Olivia ZT Jr., Dos Santos MC, Solid State Commun., 49-53, 114 (2000)