Highly ordered Ag/Cu hybrid nanostructure arrays for ultrasensitive surface-enhanced raman spectroscopy

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

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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 10−15 m for nonresonant molecules such as benzenethiol.

Original languageEnglish
Article number1600115
Number of pages7
JournalAdvanced Materials Interfaces
Volume3
Issue number13
DOIs
Publication statusPublished - 8 Jul 2016

Keywords

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

Cite this

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abstract = "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 10−15 m for nonresonant molecules such as benzenethiol.",
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Highly ordered Ag/Cu hybrid nanostructure arrays for ultrasensitive surface-enhanced raman spectroscopy. / Chen, Kun; Zhang, Xinyi; Zhang, Yongliang; Lei, Dang Yuan; Li, Haitao; Williams, Timothy; MacFarlane, Douglas R.

In: Advanced Materials Interfaces, Vol. 3, No. 13, 1600115, 08.07.2016.

Research output: Contribution to journalArticleResearchpeer-review

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