Monitoring the dispersion and agglomeration of silver nanoparticles in polymer thin films using localized surface plasmons and Ferrell plasmons

Autor(es)

Hensel, Rafael C. ^[1] ; Moreira, Murilo ^[1] ; Riul, Jr., Antonio ^[1] ; Oliveira, Jr., Osvaldo N. ^[2] ; Rodrigues, Varlei ^[1] ; Hillenkamp, Matthias ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Phys IFSC, POB 369, BR-13566590 Sao Carlos, SP - Brazil

^[3] Univ Claude Bernard Lyon 1, Univ Lyon, Inst Light & Matter, CNRS, UMR5306, F-69622 Villeurbanne - France

• Tipo de documento: Artigo Científico
• Fonte: Applied Physics Letters; v. 116, n. 10 MAR 9 2020.
• Citações Web of Science: 0

Resumo

The ability to disperse metallic nano-objects in a given matrix material is an important issue for the design and fabrication of functional materials. A means to monitor the spatial distribution of the nano-dopants is highly desirable but often possible only a posteriori and with destructive techniques. Here we present a spectroscopic characterization based on different plasmonic responses of silver nanoparticles, their agglomerates, and finally the percolated silver film. We demonstrate its usefulness for the specific case of their dispersion in layer-by-layer polymeric films but the method is extendable to any other host material transparent in the visible/near UV range. Individual silver nanoparticles display the well-known localized surface plasmon resonance around 400nm, which is red-shifted upon inter-particle coupling. The transition regime between weakly coupled particles and fully percolated metal films is, however, much harder to evidence unambiguously. We show here how to monitor this transition using the so-called Ferrell plasmon, a plasmonic mode of the thin film in the mid-UV, and excitable only under oblique irradiation but without specific coupling precautions. We can thus follow the entire transition from isolated to coupled and finally to fully agglomerated nanoparticles by optical spectroscopy. Published under license by AIP Publishing. (AU)

• Processo FAPESP: 14/03691-7 - Fabricação de dispositivos microfluídicos visando aplicações em agricultura de precisão e bioenergia
• Beneficiário: Antonio Riul Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 13/14262-7 - Filmes nanoestruturados de materiais de interesse biológico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/12807-4 - Camadas de polímero com incorporação de nanopartículas metálicas: plataforma para construção de bio(sensores)
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional