Shape effect of surface-enhanced Raman scattering-active-substrate-based nanoparticles on local electric field for biochemical sensing application

En Tzu Lee, Hui Wen Cheng, Jung Yen Yang, Yiming Li*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

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.

Original languageEnglish
Pages (from-to)871-877
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume17
Issue number2
DOIs
StatePublished - Feb 2017

Keywords

  • Alloy nanoparticle
  • Electric field
  • Experiment
  • Nanocage
  • Nanoparticle
  • Sensing application
  • SERS
  • Shape effect
  • Simulation

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