Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Fabrication of TiO2/polyelectrolyte thin film for a methyl mercaptan gas sensor

메칠멜캅탄 가스센서용 TiO2/전해질폴리머 박막 제조

  • Kim, Jin-Ho (Korea Institute of Ceramic Engineering and Technology, Electronic & Optic Material Center) ;
  • Hwang, Jong-Hee (Korea Institute of Ceramic Engineering and Technology, Electronic & Optic Material Center) ;
  • Lee, Mi-Jai (Korea Institute of Ceramic Engineering and Technology, Electronic & Optic Material Center) ;
  • Kim, Sei-Ki (Korea Institute of Ceramic Engineering and Technology, Electronic & Optic Material Center) ;
  • Lim, Tae-Young (Korea Institute of Ceramic Engineering and Technology, Electronic & Optic Material Center)
  • 김진호 (한국세라믹기술원 전자.광소재센터) ;
  • 황종희 (한국세라믹기술원 전자.광소재센터) ;
  • 이미재 (한국세라믹기술원 전자.광소재센터) ;
  • 김세기 (한국세라믹기술원 전자.광소재센터) ;
  • 임태영 (한국세라믹기술원 전자.광소재센터)
  • Received : 2010.09.14
  • Accepted : 2010.10.11
  • Published : 2010.10.31
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Abstract

Quartz crystal microbalance (QCM) gas sensor to detect methyl mercaptan ($CH_3SH$) gas was fabricated by depositing $TiO_2$ nanoparticles and polyelectrolyte on the electrode of QCM. The $TiO_2$/poly(sodium 4-styrenesulfonate) (PSS) thin film fabricated by a layer-by-layer self-assembly (LBL-SA) method showed a high surface area and increased the sensitivity of gas sensor. When the QCM sensors coated with triethanolamine (TEA) or ($TiO_2$/PSS) were exposed to methyl mercaptan gas (1.0 ppm), the frequency shifts of QCM with TEA casting film and $TiO_2$/PSS thin film were ca. 9 Hz and ca. 24 Hz, respectively. As the bilayer number of ($TiO_2$/PSS) increased, the frequency shift of QCM sensor with ($TiO_2$/PSS) thin film was gradually increased. In addition, the frequency shift of QCM sensor was gradually increased as the concentration of methyl mercaptan gas increased from 0.5 ppm to 2.0 ppm. In this study, the surface morphology and sensor property of QCM sensor coated with ($TiO_2$/PSS) thin film were measured.

메칠멜캅탄($CH_3SH$) 가스를 검출하는 수정진동자(QCM) 가스센서를 QCM의 전극에 $TiO_2$ 나노입자와 전해질 폴리머를 증착하여 제조하였다. LBL-SA법에 의해 제조된 $TiO_2$/PSS 박막은 높은 비표면적을 나타내었고, 가스센서의 감도를 증가시켰다. 1.0 ppm의 농도를 갖는 메칠멜캅탄에 노출된 TEA 혹은 $TiO_2$/PSS 막이 증착된 QCM의 주파수 변이는 각각 약 9 Hz, 2 Hz 였다. ($TiO_2$/PSS) 박막의 증착수가 늘어남에 따라 제조된 박막의 비표면적이 증가하게 되어 QCM 센서의 주파수 변이도 점차적으로 증가하였다. 추가적으로 메칠멜캅탄 가스의 농도가 0.5 ppm에서 2.0 ppm으로 높아짐에 따라 QCM 센서의 주파수 변화도 증가되었다. 본 연구에서는, ($TiO_2$/PSS) 박막이 증착된 QCM 센서의 표면구조의 변화와 센서 특성을 측정하였다.

Keywords

References

  1. C. Scully, M. el-Maaytah, S.R. Porter and J. Greenman, "Breath odor: etiopathogenesis, assessment and management", Eur. J. Oral Sci. 105 (1997) 287. https://doi.org/10.1111/j.1600-0722.1997.tb00242.x
  2. J. Tamaki, K. Shimanoe, Y. Yamada, Y. Yamamoto, N. Miura and N. Yamazoe, "Dilute hydrogen sulfide sensing properties of $CuO-SnO_{2}$ thin-film prepared by lowpressure evaporation method", Sens. Actuators B 49 (1998) 121. https://doi.org/10.1016/S0925-4005(98)00144-0
  3. D.J. Yoo, J. Tamaki, S.J. Park, N. Miura and N. Yamazoe, "Copper oxide-loaded tin dioxide thin-film for detection of dilute hydrogen sulfide", Jpn. J. Appl. Phys. 34 (1995) L 455. https://doi.org/10.1143/JJAP.34.L455
  4. M. Ando, S. Suto, T. Suzuki, T. Tsuchida, C. Nakayama, N. Miura and N. Yamazoe, "$H_{2}S$ and CH3SH sensor using a thick-film of gold-loaded tungsten oxide", Chem. Lett. (1994) 335.
  5. J. Tamaki, Y. Yamada, Y. Yamamoto, M. Matsuoka and I. Ota, "Sensing properties to dilute hydrogen sulfide of $ZnSb_{2}O_{2}$ thick-film prepared by dip-coating method", Sens. Actuators B 66 (2000) 70. https://doi.org/10.1016/S0925-4005(99)00408-6
  6. C. Xiangfeng and P. Siciliano, "$CH_{3}SH$-sensing characteristics of $LaFeO_{3}$ thick-film prepared by co-precipitation method", Sens. Actuators B 94 (2003) 197. https://doi.org/10.1016/S0925-4005(03)00340-X
  7. S. Qin, Z. Wu, Z. Tang, Y. Song, F. Zeng and D. Zhao, "The sensitivity to $SO_{2}$ of the SAW gas sensor with triethanolamine modified with boric acid", Sens. Actuators B 66 (2000) 240. https://doi.org/10.1016/S0925-4005(00)00361-0
  8. S.M. Aguirre, A. Yoshino, T. Nakamichi and T. Moriizumi, "Odor approximation of fruit flavors using a QCM odor sensing system", Sens. Actuators B 123 (2007) 1101. https://doi.org/10.1016/j.snb.2006.11.025
  9. A. Ozmen, F. Tekce, M.A. Ebeo lu, C. Ta altin and Z.Z. Ozturk, "Finding the composition of gas mixtures by a phtalocyanine-coated QCM sensor array and an artificial neural metwork", Sens. Actuators B 115 (2006) 450. https://doi.org/10.1016/j.snb.2005.10.007
  10. B. Ding, J. Kim, Y. Miyazaki and S. Shiratori, "Electrospun nanofibrous membranes coated quartz crystal microbalance as gas sensor for $NH_{3}$ detection", Sens. Actuators B 101 (2004) 373. https://doi.org/10.1016/j.snb.2004.04.008
  11. J.H. Kim, S.H. Kim and S. Shiratori, "Fabrication nanoporous and hetro structure thin film via a layer-bylayer self assembly method for a gas sensor", Sens. Actuators B 102 (2004) 241. https://doi.org/10.1016/j.snb.2004.04.026
  12. G. Decher, J.D. Hong and J. Schmitt, "Buildup of ultrathin multilayer films by a self-assembly process: III. Consequtively alternating adsorption of anionic and cationic polyelectrolytes on charged surfaces", Thin Soild Films, 210/211 (1992) 831. https://doi.org/10.1016/0040-6090(92)90417-A
  13. J.D. Mendelsohn, C.J. Barrett, V.V. Chan, A.J. Pal, A.M. Mayes and M.F. Rubner, "Fabrication of microporous thin films from polyelectrolyte multilayers", Langmuir 16 (2000) 5017. https://doi.org/10.1021/la000075g
  14. S.S. Shiratori and M.F. Rubner, "pH-dependent thickness behavior sequentially adsorbed layers of weak polyelectrolytes", Macromolecules 33 (2000) 4213. https://doi.org/10.1021/ma991645q