Nanocatalyst sensitizers by agglomeration of nanofilms

J. Mizsei, Lauri Pirttiaho, Mikko Karppinen, Vilho Lantto

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The sensor function of a semiconducting metal oxide, like SnO2, when used as a chemical gas sensor is based on modification of the chemical and electronic structure of the surface by adsorption and desorption reactions. In native form of these materials, many molecules cause very similar changes in the electrical conductivity or the work function. To differentiate between various molecules and to amplify the response, i.e., to improve the selectivity and the sensitivity, catalysts can be added onto the surface of such materials. A layer of noble metal nanoparticles is an effective and controllable kind of catalyst suitable for this purpose. We present a method to achieve a layer of noble metal, such as Pd, Ag, Pt or Au, nanoparticles on oxide surfaces. We begin with sputtering deposition of an amorphous metal nanofilm of the thickness of about 5 nm. The film is agglomerated to nanoparticles either via direct crystallization by heating, in the case of non-reacting atmosphere, or by growth of oxide crystallites and subsequential reduction of these in a reducing atmosphere. We present also results of characterization of the initial nanofilm and the resulting nanoparticles by X-ray diffraction, electrical conductivity measurement, scanning force microscopy and transmission electron microscopy.

Original languageEnglish
Pages (from-to)195-198
Number of pages4
JournalSensors and Actuators, B: Chemical
Volume65
Issue number1
DOIs
Publication statusPublished - Jun 30 2000

Fingerprint

agglomeration
Oxides
Agglomeration
Precious metals
Nanoparticles
Chemical sensors
nanoparticles
noble metals
Metals
Catalysts
Molecules
Catalyst selectivity
Metal nanoparticles
Crystallization
Crystallites
catalysts
atmospheres
electrical resistivity
Electronic structure
Sputtering

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Nanocatalyst sensitizers by agglomeration of nanofilms. / Mizsei, J.; Pirttiaho, Lauri; Karppinen, Mikko; Lantto, Vilho.

In: Sensors and Actuators, B: Chemical, Vol. 65, No. 1, 30.06.2000, p. 195-198.

Research output: Contribution to journalArticle

Mizsei, J. ; Pirttiaho, Lauri ; Karppinen, Mikko ; Lantto, Vilho. / Nanocatalyst sensitizers by agglomeration of nanofilms. In: Sensors and Actuators, B: Chemical. 2000 ; Vol. 65, No. 1. pp. 195-198.
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