Shape Effect of Surface-Enhanced Raman Scattering-Active-Substrate-Based Nanoparticles on Local Electric Field for Biochemical Sensing Application.
J Nanosci Nanotechnol
; 17(2): 871-77, 2017 Feb.
Article
em En
| MEDLINE
| ID: mdl-29668221
ABSTRACT
The metal nanoparticles exhibit different degrees of localized surface plasmon resonance which depends on different type nano-sized structures. In this work, in experiment, Au/TiO2/Ti/Si SERS-active substrate with spherical shape nanoparticles is fabricated by using a hydrothermal treatment process and applied to detect Rhodamine 6G sample. Based on experimental observation, a three-dimensional finite-difference time-domain simulation is utilized to explore the local field distributions. We examine the effect of surface roughness and shape of Au nanoparticles on the enhancement magnitude of local electric field of SERS-active substrates. Besides, different shapes of nanoparticles, nanocages and Au/Ag alloy nanoparticles are also modeled and discussed. The engineering findings of this study indicate that the substrate with roughened surface may exhibit large electric field enhancement; in particular, for the cubic shape of nanoparticles. The electric field enhancement of spherical and cubic nanoparticles could be further enlarged by Au/Ag alloy and Au nanocage structures. The results may benefit the design and fabrication of nanoparticles for various biochemical sensing applications.
Palavras-chave
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Análise Espectral Raman
/
Ressonância de Plasmônio de Superfície
/
Nanopartículas Metálicas
/
Ouro
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article