Effects of various metal additives on the gas sensing performances of TiO2 nanocrystals obtained from hydrothermal treatments

Ana M. Ruiz, Albert Cornet, Kengo Shimanoe, Joan R. Morante, Noboru Yamazoe

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)


Nanocrystalline titanium dioxide after hydrothermal treatment was loaded singly or doubly with various metals or metal oxides (Au, Ag, Pt, Pd, Cu, Co, Nb, V). Hydrothermally treated TiO2 exhibited enhanced thermal stability: resistance to grain growth and phase transformation. Incorporation of metal additives further decreased the grain size of titania, while the phase transition was generally promoted, except in the case of Au and Pd, which maintained predominant anatase phase at 800 °C. Among the different additives tested, Au was found to be the most attractive promoter for the CO sensing properties. Therefore, studies were extended to several Au concentrations on TiO2 and, in addition, to simultaneous loads of Au and Nb or V. Doubly modified Au- and Nb-TiO2 presented the highest Au content on surface, as inferred from XPS measurements, and exhibited the largest and fastest sensor response to CO at high operating temperatures.

Original languageEnglish
Pages (from-to)34-40
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number1-2 SPEC. ISS.
Publication statusPublished - Jul 22 2005

All Science Journal Classification (ASJC) codes

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


Dive into the research topics of 'Effects of various metal additives on the gas sensing performances of TiO<sub>2</sub> nanocrystals obtained from hydrothermal treatments'. Together they form a unique fingerprint.

Cite this