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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Surface Plasmon Resonances in Silver Nanostars

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Author(s):
Reyes Gomez, Faustino [1, 2] ; Rubira, Rafael J. G. [3] ; Camacho, Sabrina A. [3] ; Martin, Cibely S. [3] ; da Silva, Robson R. [4] ; Constantino, Carlos J. L. [3] ; Alessio, Priscila [3] ; Oliveira, Jr., Osvaldo N. [4] ; Ricardo Mejia-Salazar, J. [4, 5]
Total Authors: 9
Affiliation:
[1] Univ Valle, Dept Fis, Cali 25360 - Colombia
[2] Univ Cantabria, Dept Appl Phys, Avda Los Castros S-N, E-39005 Santander - Spain
[3] Sao Paulo State Univ UNESP, Sch Technol & Appl Sci, Campus Presidente Prudente, BR-19060900 Sao Paulo - Brazil
[4] Univ Sao Paulo, Sao Carlos Inst Phys, POB 369, BR-13560970 Sao Carlos, SP - Brazil
[5] Natl Inst Telecommun Inatel, BR-37540000 Santa Rita Do Sapucai, MG - Brazil
Total Affiliations: 5
Document type: Journal article
Source: SENSORS; v. 18, n. 11 NOV 2018.
Web of Science Citations: 0
Abstract

The recent development of silver nanostars (Ag-NSs) is promising for improved surface-enhanced sensing and spectroscopy, which may be further exploited if the mechanisms behind the excitation of localized surface plasmon resonances (LSPRs) are identified. Here, we show that LSPRs in Ag-NSs can be obtained with finite-difference time-domain (FDTD) calculations by considering the nanostars as combination of crossed nanorods (Ag-NRs). In particular, we demonstrate that an apparent tail at large wavelengths (lambda greater than or similar to 700 nm) observed in the extinction spectra of Ag-NSs is due to a strong dipolar plasmon resonance, with no need to invoke heterogeneity (different number of arms) effects as is normally done in the literature. Our description also indicates a way to tune the strongest LSPR at desired wavelengths, which is useful for sensing applications. (AU)

FAPESP's process: 16/06612-6 - Printed and implantable biosensor made from biopolymers for long-term monitoring
Grantee:Robson Rosa da Silva
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 16/12311-9 - Transversal magneto-optical Kerr effect for the design and development of biosensors
Grantee:Jorge Ricardo Mejía Salazar
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:Osvaldo Novais de Oliveira Junior
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/09634-0 - Interaction between biomembrane models based on Langmuir films and giant unilamellar vesicles (GUVs) with triazine herbicides and detection via SERS spectroscopy
Grantee:Rafael Jesus Gonçalves Rubira
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/01897-4 - Synthesis of gold nanoparticles for enhancement of Raman Scattering (SERS) and fluorescence (SEF) targeting sensory applications
Grantee:Sabrina Aléssio Camacho
Support type: Scholarships in Brazil - Doctorate