Fabrication of TiO2/polyelectrolyte thin film for a methyl mercaptan gas sensor (메칠멜캅탄 가스센서용 TiO2/전해질폴리머 박막 제조)

김진호; Jonghee Hwang (황종회); Mi-Jai Lee (이미재); Seiki Kim (김세기); Tae-Young Lim (임태영)

Fabrication of TiO2/polyelectrolyte thin film for a methyl mercaptan gas sensor

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2010, 20(5), pp.221-226
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

김진호 ¹, Jonghee Hwang ¹, Mi-Jai Lee ¹, Seiki Kim ¹, Tae-Young Lim ¹

¹한국세라믹기술원

Accredited

ABSTRACT

Quartz crystal microbalance (QCM) gas sensor to detect methyl mercaptan (CH3SH) gas was fabricated by depositing TiO2 nanoparticles and polyelectrolyte on the electrode of QCM. The TiO2/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 (TiO2/PSS) were exposed to methyl mercaptan gas (1.0 ppm), the frequency shifts of QCM with TEA casting film and TiO2/PSS thin film were ca. 9 Hz and ca. 24 Hz, respectively. As the bilayer number of (TiO2/PSS) increased, the frequency shift of QCM sensor with (TiO2/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 (TiO2/PSS) thin film were measured.

KEYWORDS

Gas sensor, Methyl mercaptan, TiO2, Polyelectrolyte, Thin film

Citation status

* References for papers published after 2023 are currently being built.

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