Surface-enhanced absorption by self-organized silver films with aciniform-like nanoaggregates at elevated temperatures

摘要: Morphological evolution of silver nanocomposite films prepared by the wet colloidal route and surface-enhanced phenomena on aggregate nanostructures evolved during annealing were investigated. Dramatic changes in morphologies particles pores incurred rearragement, coarsening, premelting, dewetting clusters at different concentrations (i.e., mass thicknesses). At a higher thickness, morphological transitions from self-organized nanoaggregates with aciniform pattern 300 °C to elongated coarsened circular holes 400 island 500 occurred films. The peculiar absorption much redder broader surface plasmon feature, which gone far beyond theoretical prediction, induced formation embedded porous polymer matrix critical thickness 9.6 nm partial degradation PVP rearrangement °C. was dramatically reduced elemination spontaneous nanoisland film temperature