Abstract
The effect of ambient air humidity on surface acoustic waves (SAW) in graphite oxide-lithium niobate structures was investigated. The acoustic wave amplitude and phase strongly depended on the humidity level in structures with graphite oxide films deposited on the free substrate surface. These dependencies were significantly reduced in structures with graphite oxide films deposited on a metalized substrate surface. Fast (sub-second range) response in the acoustic amplitude and phase to step-like humidity changes was observed. Humidity-induced variations in the SAW amplitude and velocity are attributed to acoustoelectric interaction and mass loading due to moisture adsorption by graphite oxide layers.
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