A new approach to making silver colloid nanoparticle based SERS substrates has been demonstrated. A self-assembled silver film with plasmon resonance has been obtained by self-assembly. Four-valent ammonium salts have been used as coordinating molecules. The method is simple and does not involve complicated machinery or difficult mask making techniques that are used to fabricate SERS substrates today. It involves mixing the tetraoctylammonium bromide or tetrabutylammonium nitrate with hexane and silver nanoparticle water colloid solution in one vial, shaking it to obtain a monolayer film on hexane surface and just pouring it onto the cleaned substrate. The anodic alumina barrier layer has been used to induce more uniform self-assembly of colloid films. This SERS structure can be used in conventional plasmonics, sensors and medical applications
The hybrid nanomaterials based on inorganic matrix and organic compound with customizable properties have practical potential in the field of new developments in biological and chemical sensors, photonic and solar cell devices, as well as laser media. The optical properties of molecular clusters so called J-aggregates embedded in nanoporous aluminum oxide in presence of silver plasmonic nanoparticles were studied. The unique technique for obtaining nanoporous aluminum oxide on the island silver film was proposed. The optimal parameters of the impregnation of nanopores in the ethanol solution of pseudoisocyanine dye for the J-aggregate formation have been studied. The resonant transfer of optical energy from the oxygen vacancy in aluminum oxide to organic molecules was observed in the resulting hybrid films.
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