Metal/non-metal interfaces: adhesion of gold on mica

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Abstract
The adhesion of small gold particles and evaporated gold films to air-cleaved and ultra-high-vacuum-cleaved mica surfaces has been investigated. A vacuum microbalance revealed large variations of particle adhesion for different regions of a vacuum-cleaved surface. A potential probe available in the same system similarly showed large variations in the surface charge. The potential variation and large adhesion disappear on exposure of the surface to contaminants or upon irradiation by an electron beam. These regional variations are believed to be due to local excess and deficiency of potassium ions, created during cleavage. For evaporated gold films on mica, adhesive strengths were compared using a simple cantilever method. Films deposited on vacuum-cleaved faces adhere much more strongly than those on air-cleaved surfaces.

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