Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Gas Sensors with Nanostructured SnO2 Thick Films with Different Pd Doping Concetrations by an Ink Dropping Method

  • Yoon, Hee Soo (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Kim, Jun Hyung (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Kim, Hyun Jong (Surface Technology R&BD Group, Korea Institute of Industrial Technology) ;
  • Lee, Ho Nyun (Surface Technology R&BD Group, Korea Institute of Industrial Technology) ;
  • Lee, Hee Chul (Department of Advanced Materials Engineering, Korea Polytechnic University)
  • Received : 2017.04.11
  • Accepted : 2017.05.16
  • Published : 2017.05.31
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Abstract

Pd-doped $SnO_2$ thick film with a pure tetragonal phase was prepared on patterned Pt electrodes by an ink dropping method. Nanostructured $SnO_2$ powder with a diameter of 10 nm was obtained by a modified hydrazine method. Then the ink solution was fabricated by mixing water, glycerol, bicine and the Pd-doped $SnO_2$ powder. When the Pd doping concentration was increased, the grain size of the Pd-doped $SnO_2$ thick film became smaller. However, an agglomerated and extruded surface morphology was observed for the films with Pd addition over 4 wt%. The orthorhombic phase disappeared even at a low Pd doping concentration and a PdO peak was obtained for a high Pd doping concentration. The crack-free Pd-doped $SnO_2$ thick films were able to successfully fill the $30{\mu}m$ gap of the patterned Pt electrodes by the optimized ink dropping method. The prepared 3 wt% Pd-doped $SnO_2$ thick films showed monoxide gas responses ($R_{air}/R_{CO}$) of 4.0 and 35.6 for 100 and 5000 ppm, respectively.

Keywords

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