Highly Ordered Ag/Cu Hybrid Nanostructure Arrays for Ultrasensitive Surface-Enhanced Raman Spectroscopy

Kun Chen, Xinyi Zhang, Yongliang Zhang, Dangyuan Lei, Haitao Li, Timothy Williams, Douglas R. MacFarlane

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

KGaA, Weinheim Despite significant progress recently made in this field, the practical application of surface-enhanced Raman spectroscopy (SERS) is frequently limited by the lack of highly sensitive, reproducible, and cost-effective substrates. The fabrication of SERS substrates with a consistently high density of hot-spots is a key step to address this issue. Here, a simple approach is reported for the fabrication of Ag/Cu hybrid nanostructure arrays as highly sensitive and cost-effective substrates for SERS application. By effectively tuning the gap size between neighboring nanorods to sub-10 nm and increasing the packing density of nanorods, ordered Cu nanorod arrays can be used as cheap and effective SERS substrates in their own right. After sputtering a very thin layer of Ag nanoparticles on the surface of the Cu nanorods to get sub-5 nm gaps, further field enhancement is enabled. A cascaded field enhancement has been evidenced by the electromagnetic simulations. The Ag/Cu hybrid nanostructure arrays exhibit a detection limit down to 10−15m for nonresonant molecules such as benzenethiol.
Original languageEnglish
Article number1600115
JournalAdvanced Materials Interfaces
Volume3
Issue number13
DOIs
Publication statusPublished - 8 Jul 2016

Keywords

  • benzenethiol
  • hybrid nanostructures
  • nanorod arrays
  • surface-enhanced Raman spectroscopy
  • ultrasensitive

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

Cite this