Effect of potassium on the surface potential of titania
- 1 January 1994
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 90 (6) , 895-898
- https://doi.org/10.1039/ft9949000895
Abstract
The surface potential, χ, of several commercial titania powders has been measured by the vibrating condenser method in the temperature range 100–450 °C in air. The K impurity detected by XPS on some of titanias lowers the χ value of TiO2 considerably. A series of K-doped TiO2 anatase samples containing from 1.1 to 11 K atoms nm–2 was prepared and examined by surface potential and XPS techniques. The surface potential of anatase decreases linearly with increasing potassium content up to ca. 2.4 K atoms nm–2, and then remains constant. The surface potential of K-doped samples varies to a smaller extent with temperature compared with undoped anatase. On the basis of the surface potential and XPS data obtained, it is suggested that the mode of K deposition on the surface of anatase changes at a coverage of about 2 K atoms nm–2.Keywords
This publication has 0 references indexed in Scilit: