Fabrication of nanoporous and hetero structure thin film via a layer-by-layer self assembly method for a gas sensor

Jin Ho Kim, Sae Hoon Kim, Seimei Shiratori

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Nanoporous and hetero structure thin film consisted of weak polyelectrolytes and TiO2 nanoparticles was fabricated by the sequential depositions of oppositely charged solutions via a layer-by-layer self assembly (LBL-SA) method on a quartz crystal microbalance (QCM) at room temperature and then by an immersion in acidic water (pH 1.8) for 2min and neutral water for 10s subsequently. Because in this process, the ionic bonds of weak polyelectrolytes between poly(allylamine hydrochloride) and poly(acrylic acid) were broken, which contributed to separate the agglomerated TiO 2 nanoparticles in thin film. In order to measure the gas sensitivity of hetero structure thin film with a high surface area, the frequency shifts of a QCM were monitored as functions of the concentration of ammonia gas and relative humidity. The QCM immersed in acidic water showed larger frequency shifts than the QCM, without an immersion. As the concentration of gas and relative humidity were increased, the frequency shifts of a QCM were also increased gradually.

Original languageEnglish
Pages (from-to)241-247
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume102
Issue number2
DOIs
Publication statusPublished - 2004 Sep 13

Keywords

  • Gas sensor
  • Layer-by-layer self assembly
  • Polyelectrolyte
  • Titanium dioxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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