Modeling and experimental investigations of nanostructured Ag thin films produced by oblique-angle deposition and its SERS performance

Datai Hui, Shun Zhou, Changlong Cai*, Shigeng Song*, Zhentao Wu, Jian Song, Da Zhang, Xiao Meng, Bo Lu, Yingbu Duan, Hayrigul Tursun, Des Gibson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The growth mechanism of nanocolumnar silver thin film deposited on a smooth silicon substrate using electron beam evaporation process at an oblique angle was simulated with the Kinetic Monte Carlo method. Following the simulated silver nanostructured thin film, a further computational simulation was done using COMSOL for surface-enhanced Raman scattering effects. The simulation results were compared against corresponding experimental results, which demonstrated high agreement between simulation results and experimental data. It was found that as the incident deposition angle increased, the density of the Ag thin film significantly decreased and the surface roughness increased. When the incident deposition angle was at 75 and 85, the resulting nanocolumnar structure was significantly tilted. For Ag thin films deposited at all investigated angles, surface-enhanced Raman scattering effects were observed. Particularly, the Ag nanocolumns deposited at 85 showed remarkable Surface-enhanced Raman Scattering effects. This was seen in both COMSOL simulations and experimental results: Enhancement factors were 2 × 107 in COMSOL simulation and 3.3 × 105 in the experiment.

Original languageEnglish
Article number458
Number of pages15
JournalCoatings
Volume11
Issue number4
DOIs
Publication statusPublished - 15 Apr 2021

Keywords

  • Kinetic Monte Carlo simulation
  • nanocolumnar structure
  • oblique-angle deposition
  • SERS
  • silver thin film

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