Abstract
Spatially correlated topography, fluorescence, and Raman scattering signals of metal-free phthalocyanine (H2Pc) nanofilms were imaged using confocal and tip-enhanced (fluorescence and Raman) near-field optical microscopy at lateral spatial resolutions of 500 nm and ∼25 nm, respectively. The far-field fluorescence intensity was found to vary inversely with film thickness up to 10 nm, with the strongest emission coming from isolated H2Pc molecules on samples with submonolayer coverage. Changes in the fluorescence energy distribution were imaged and were consistent with exciton coupling predictions for H2Pc molecules lying edge-to-edge on the surface. Thicker H2Pc films (>10 nm) were found to consist entirely of nonfluorescing aggregates and crystal domains. Tip-enhanced near-field measurements were carried out with W and Au (plasmonic) tips to investigate the local optical properties of H2Pc films and nanostructures. In general, fluorescence increased by a factor of 2–3× compared to the far-field when the t...
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