Fabrication of Ag‐modified nanocone frustum arrays with controlled shape as active substrates for surface‐enhanced Raman scattering

J Raman Spectrosc. 2019;1–13. Abstract Surface‐enhanced Raman scattering (SERS) substrates utilizing the interparticle nanogaps as hot spots can provide ultrasensitive and geometry‐dependent enhancement factors in analyte detection. Here, we report theoretical and experimental studies on the optical properties of Ag nanoparticles‐decorated Si‐nanocone frustum (NCF) arrays with various geometrical dimensions to enable engineering of the most effective SERS substrate. Our fabrication steps include electron beam lithography, deep reactive‐ion etching, and metallization. In this regard, the effect of geometrical parameters including height, diameter, and slant angle, associated with Si‐NCF arrays, on optical properties and SERS effect are investigated. Results show that the NCF array with larger height and slant angle exhibit higher antireflection property and excellent performance for low‐concentration analyte molecules detection. Furthermore, our results show that the excitation of Mie resonances in NCF arrays leads to formation of near electric field distributions and enhancement of Si Raman lines. It is demonstrated that the strength of Si Raman line follows the trend of the integrated near electric fields in the excitation volume.

• Publication year

  2019

• Venue

  Journal of Raman Spectroscopy

• Publication date

  2019-07-29

• Fields of study

  Materials Science, Chemistry, Engineering

• Identifiers
  DOI 10.1002/JRS.5662
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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