Reyes Gómez, FaustinoRubira, 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 Ricardo2019-10-062019-10-062018-11-08Sensors (Basel, Switzerland), v. 18, n. 11, 2018.1424-8220http://hdl.handle.net/11449/188343The 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.engAg nanostarsmetallic nanoparticlesplasmonic biosensingArtigo10.3390/s18113821Acesso aberto2-s2.0-8505638029297271222032192630000-0002-1345-0540