AVS 50th International Symposium
    Surface Science Friday Sessions
       Session SS2-FrM

Paper SS2-FrM10
Temperature Dependent Water Adsorption on BSCCO Single Crystal

Friday, November 7, 2003, 11:20 am, Room 328

Session: Oxide Surfaces and Interfaces
Presenter: X.F. Hu, University of Wisconsin-Milwaukee
Authors: X.F. Hu, University of Wisconsin-Milwaukee
D.A. Human, University of Wisconsin-Milwaukee
C.J. Hirschmugl, University of Wisconsin-Milwaukee
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Infrared Reflection adsorption spectroscopy and Temperature Programmed Desorption studies of water adsorption on the surface normal to ab-plane of BSCCO single crystal reveal the molecular adsorption of water. The monolayer and multilayer desorption temperature is approximately 167 K. The absorption bands occur between 3200-3500 cm-1 for the OH stretching, suggesting hydrogen bonding. The OH stretching bands change their absorption signatures as a function of temperature. For 2 L exposure, one asymmetric broad band is observed at approximately 3350 cm-1 at 80 K , and becomes symmetric at 140K. At 150K, less water is adsorbed, exhibiting a sharper feature at 3250 cm-1 with both high and low frequency shoulders. Below 140K, the adsorbed water forms clusters, and above 150K, it forms clusters with more bulk-like character.