Thin silver island substrates with different sizes and different states of aggregation of the silver particles are prepared by evaporation and a thermal annealing process. The Langmuir−Blodgett monolayer of 4-octyl-4‘-(3-carboxytrimethyleneoxy)azobenzene are deposited on these silver-coated substrates, and their infrared spectra are studied. The experimental results reveal that the enhancement factor decreases as the silver particles become less aggregated.
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Zhang et al. (1998) studied this question.
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