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Embedding Pd into SnO2 drastically enhances gas sensing.

Katarzyna Jabłczyńska1,2, Alexander Gogos3,4, Christian M P Kubsch1

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Noble metal nanoparticles, specifically palladium, embedded in tin dioxide (SnO2) particles significantly enhance gas sensor performance. This method improves sensitivity to acetone and carbon monoxide, crucial for developing advanced gas detection technologies.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Combustion aerosol processes enable unique noble metal integration into semiconducting particles.
  • Tin dioxide (SnO2) is a widely studied semiconductor for gas sensing applications.
  • Noble metals like palladium (Pd) are known to enhance the catalytic and sensing properties of metal oxides.

Purpose of the Study:

  • To synthesize monocrystalline SnO2 particles embedded with palladium (Pd) and/or palladium oxide (PdO) using flame spray pyrolysis (FSP).
  • To investigate the effect of embedded Pd/PdO on the gas sensing performance of SnO2-based sensors.
  • To correlate the synthesis parameters with particle characteristics and sensor response.

Main Methods:

  • Flame spray pyrolysis (FSP) for synthesizing Pd-embedded SnO2 particles.
  • Post-synthesis treatments including air annealing and nitric acid leaching.
  • Characterization using nitrogen adsorption, high-resolution electron microscopy, and X-ray photoelectron spectroscopy (XPS).
  • Gas sensing measurements of acetone and carbon monoxide (CO) at 350 °C and 50% relative humidity.

Main Results:

  • Monocrystalline SnO2 particles with embedded Pd/PdO were successfully synthesized, with crystal size controlled by precursor concentration.
  • The embedded fraction of Pd ranged from 30-80%, tunable by FSP parameters.
  • Pd/PdO embedding significantly boosted sensor response to 1 ppm acetone and CO, by 2-6 times at low Pd content (0.2 mol%) and up to two orders of magnitude at higher content (1 mol%).
  • Baseline resistance measurements indicated altered transducing properties due to Pd atoms in the SnO2 lattice or Pd/PdO clusters.

Conclusions:

  • Flame spray pyrolysis is an effective method for creating SnO2 particles with embedded noble metals.
  • Embedding Pd/PdO into SnO2 dramatically enhances gas sensor sensitivity and response.
  • The enhanced sensing is attributed to the catalytic activity and nanoelectrode effects of the embedded Pd/PdO species within the SnO2 matrix.