Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Hensel, Rafael C. [1] ; Moreira, Murilo [1] ; Riul, Jr., Antonio [1] ; Oliveira, Jr., Osvaldo N. [2] ; Rodrigues, Varlei [1] ; Hillenkamp, Matthias [1, 3]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Applied Physics Letters; v. 116, n. 10 MAR 9 2020.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 14/03691-7 - Fabrication of microfluidic devices envisanging aplications in precision agriculture and bioenergy
Grantee:Antonio Riul Júnior
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:Osvaldo Novais de Oliveira Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/12807-4 - Polymer layers with embedded metal nanoparticles: building blocks for (bio)sensors
Grantee:Osvaldo Novais de Oliveira Junior
Support Opportunities: Research Grants - Visiting Researcher Grant - International