Highly sensitive and selective trimethylamine sensors using Ru-doped SnO 2 hollow spheres

Kang Min Kim, Kwon Il Choi, Hyun Mook Jeong, Hyo Joong Kim, Hae Ryong Kim, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


The 0.45 mol% Ru-doped SnO 2 (Ru-SnO 2) hollow spheres, each with a shell thickness of ∼17 nm, were prepared by the uniform coating of Ru- and Sn-precursors onto SiO 2 microspheres with diameters of ∼300 nm, followed by heat treatment at 350°C and subsequent removal of the core SiO 2 using a dilute HF solution. The Ru-SnO 2 hollow spheres showed high responses to 5 ppm trimethylamine (TMA) at 350°C with negligible cross-responses to toluene, benzene, NH 3, CO, H 2, and C 3H 8 and decreased cross-responses to C 2H 5OH, while undoped SnO 2 hollow spheres showed similar responses to TMA and C 2H 5OH. The selective and sensitive detection of TMA that was achieved in Ru-doped SnO 2 hollow spheres is explained in relation to the catalytic sensitization of Ru and the gas-accessible hollow morphology of the thin shell configurations.

Original languageEnglish
Pages (from-to)733-738
Number of pages6
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2012 May 20


  • Gas sensors
  • Hollow spheres
  • Ru-SnO
  • Trimethylamine

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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