Surface Plasmon Resonances in Silver Nanostars
Nenhuma Miniatura disponível
Data
2018-11-08
Autores
Reyes Gómez, Faustino
Rubira, Rafael J G [UNESP]
Camacho, Sabrina A. [UNESP]
Martin, Cibely S. [UNESP]
da Silva, Robson R.
Constantino, Carlos J L [UNESP]
Alessio, Priscila [UNESP]
Oliveira, Osvaldo N.
Mejía-Salazar, J Ricardo
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
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 ( λ ≳ 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.
Descrição
Palavras-chave
Ag nanostars, metallic nanoparticles, plasmonic biosensing
Como citar
Sensors (Basel, Switzerland), v. 18, n. 11, 2018.