Hierarchical micro/nanostructured TiO 2 /Ag substrates based on femtosecond laser structuring: A facile route for enhanced SERS performance and location predictability

Jinlong Lu, Jianjun Yang, Subhash C. Singh, Zhibing Zhan, Zhi Yu, Wei Xin, Ting Huang, Chunlei Guo

Research output: Contribution to journalArticlepeer-review

Abstract

Hierarchical micro/nanostructured TiO 2 /Ag substrates for surface-enhanced Raman scattering (SERS) application are fabricated by depositing Ag nanoparticles on the surface of TiO 2 hierarchical micro/nanostructures, which are formed by combining femtosecond laser structuring with scalable hydrothermal treatment. Our results show that the morphology of hierarchical micro/nano TiO 2 /Ag architectures can significantly influence SERS performance. Compare with one-dimensional TiO 2 /Ag nanostructures hydrothermally fabricated on laser untreated Ti surface, a four-fold enhancement is shown in the SERS signal with excellent reproducibility. Most importantly, enhancement is significantly stronger in the valleys of our microstructures than on the hills due to geometrical orientation of nanostructures on the surface of the microstructure. The site predictability for SERS enhancement is one of the major roadblock for SERS applications. Present study provides an effective way to enhance the site predictability for optimal SERS in addition to a significant enhancement in signal strength.

Original languageEnglish
Pages (from-to)737-743
Number of pages7
JournalApplied Surface Science
Volume478
DOIs
Publication statusPublished - 2019 Jun 1
Externally publishedYes

Keywords

  • Chemical treatment
  • Femtosecondlaser
  • Hierarchical micro/nanostructured TiO2/Ag
  • SERS

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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