4.1.4 Work Function Analysis of Gas Sensitive WO3 Layers with Pt Doping
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- 4.1 Electronic Potential-based Sensor
- G. Halek, H. Teterycz, P. Halek, P. Sochorska, K. Wisniewski - Wroclaw University of Technology (Poland), I. Baikie - KP Technology Ltd. (UK)
- 331 - 334
In this paper platinum (Pt) doped tungsten trioxide (WO3) layers have been investigated. The structures were prepared in the standard thick film technology. A scanning electron microscope (SEM) were used for the microstructure analysis of the gas sensitive layers. The work function were examined by using a Scanning Kelvin Probe (SKP). The Kelvin probe is a non-contact and nondestructive method of work function measurements and surface analysis. This tool is very sensitive to any surface potential changes of the investigated material. The measurements preformed by using the SKP shows that the screen printed WO3 layers are very homogenous and no significant defects are present. The Pt dopants added to the gas sensitive layer create small clusters on the surface of the WO3 grains. The presents of those additives changes the potential barrier between the metal oxide crystals and caused a decrease of the sensing layer resistance.