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Transition metals (Co, Cu) as additives on hydrothermally treated TiO2 for gas sensing

Ana M. Ruiz 2Albert Cornet 3Kengo Shimanoe 1Joan R. Morante 3Noboru Yamazoe 1

1. Kyushu University, Faculty of Engineering, Department of Materials Science and Engineering, Fukuoka 812-8581, Japan
2. Centre Nacional de Microelectrónica (CNM) - CSIC, Barcelona 08193, Spain
3. Electronics Department, University of Barcelona, C\ Martí i Franqu?s, Barcelona 08028, Spain

Abstract

Semiconducting metal oxide materials, such as TiO2, SnO2, In2O3 etc, play an important, steadily increasing role in almost all fields of electronics. Especially their application to gas sensors demand nanosize control strongly. In this case, nanoscale pure titanium dioxide with pertinent solid-state properties can be obtained by adopting hydrothermal treatments for the nanoprocessing of materials. On the other hand, the incorporation of catalytic additive has been a widely practiced method for tailoring the gas sensing characteristics. Depending on the element, the material processing and the fabrication of the device, it is possible to produce sensors with suitability improved for gas sensing.
In this work, hydrothermally treated TiO2 has been modified with different transition metals (Co, Cu). The nanoparticles were calcined at several temperatures and characterised. The hydrothermal treatment stabilized the TiO2 suppressing the thermal induced grain growth and shifting up the temperature of the anatase-to-rutile phase transformation. Besides the control of size and phase, the hydrothermal process highlighted how to obtain highly stable colloidal suspensions of titanium dioxide. Electrical measurement showed a particular behavior (n- or p-type) depending on the calcination or the operating temperature. We will discuss in more detail these features, together with structural characterization of the nanopowders.

 

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Related papers

Presentation: oral at E-MRS Fall Meeting 2004, Symposium A, by Ana M. Ruiz
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-30 17:08
Revised:   2009-06-08 12:55