In this work, we study the mechanism of the pronounced optical response of a dense monolayer of gold nanoislands (average height of 22.4 and a dominant center-to-center inter-island distance of ~47 nm) on a transparent substrate and 12 nm colloid nanoparticles of the same metal adsorbed onto a 7.4-nm-thick poly(2-vinyl pyridine), P2VP, brush placed between the particles and the nanoislands. The hybrid film was prepared by grafting P2VP brush onto the island monolayer followed by the adsorption of the Au nanoparticles onto the brush. In this design, the particles and the islands reside in close proximity, enabling their electromagnetic interactions. The pH-responsive brush modulates the characteristic distance between the particles anchored to the polymer chains and the immobile nanoislands on the solid substrate, leading to changes in the interparticle interactions. This architecture was used to engineer a transduction device for the nanosensor platform.
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