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A New Single-Crystal Adsorption Calorimeter for Determining Metal Adsorption and Adhesion Energies

Published online by Cambridge University Press:  15 February 2011

J. T. Stuckless ,
D. Starr ,
D. Bald  and
Charles T. Campbell
J. T. Stuckless
Affiliation:
Chemistry Department University of Washington Seattle, WA 98195–1700 USA
D. Starr
Affiliation:
Chemistry Department University of Washington Seattle, WA 98195–1700 USA
D. Bald
Affiliation:
Chemistry Department University of Washington Seattle, WA 98195–1700 USA
Charles T. Campbell
Affiliation:
Chemistry Department University of Washington Seattle, WA 98195–1700 USA
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Abstract

A microcalorimeter for measuring adsorption heats on clean single-crystal surfaces is described. The principle is similar to that pioneered by David King's group: A pulse of gas from a molecular beam adsorbs on an ultrathin single crystal's surface, causing a measurable transient heat input and temperature rise. Our novel heat detector is a 9 μm pyroelectric polymer ribbon, which is mechanically driven to make a gentle mechanical/thermal contact to the back of the singlecrystal sample during measurements. Advantages include use of thicker samples (>3 microns), sample preparation at very high temperatures, and measurements at 100 K. We have applied this to study the heats of adsorption of metals on clean, well-defined and single-crystalline oxide surfaces as a detailed function of coverage, from which we also extract the metal/oxide adhesion energy. We obtain pulse-to-pulse standard deviations of >2% for pulses containing >0.03 ML of Cu, and absolute accuracy within a few percent.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 440: Symposia CA – Structure and Evolution of Surfaces , 1996 , 103
Copyright
Copyright © Materials Research Society 1997

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