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, Volume 10, Issue 5, pp 2241–2251 | Cite as

Optimization of AgNPs/mesoPS Active Substrates for Ultra–Low Molecule Detection Process

  • Alwan M. Alwan
  • Layla A. WaliEmail author
  • Ali A. Yousif
Original Paper

Abstract

In this study, the effects of the sizes of AgNPs and the resulting hotspot nanogaps on the SERS spectra have been studied extensively. The optimal condition of AgNPs/mesoPS active substrate for efficient, high reproducibility and excellent stability was obtained at lowest nanogaps. The maximum EFs of about 1.4 × 105 and 1.2 × 105 were obtained for 10− 5 M Cy3 dye solution concentration at two average AgNP sizes of (282.95 and 338.1) nm and corresponding average nanogaps of (22.28 and 26.43) nm respectively. The better reproducibility with minimum variation of SERS intensity of about (14%) after six month aging in air was obtained for more uniform AgNPs deposited on mesoPS surface with peak nanogaps of 10 nm at 8 min immersion time. The detection limit for Cy3 dye molecules adsorbed on AgNPs/mesoPS active substrate prepared at 8 min has been evaluated as 10− 14 M and the high EF of about 5.3 × 1012 was obtained when using this concentration.

Keywords

SERS – active substrate Meso porous silicon Silver nanoparticles Cryptocyanine dye 

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Notes

Acknowledgments

The authors would like to express their gratitude to the Department of Applied Sciences/University of Technology for assistance with samples preparation and to the Nanoscience and Nanotechnology Research Center—University of Tehran for assistance with SERS measurements.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Alwan M. Alwan
    • 1
  • Layla A. Wali
    • 2
    Email author
  • Ali A. Yousif
    • 3
  1. 1.Department of Applied SciencesUniversity of TechnologyBaghdadIraq
  2. 2.College of Basic EducationAl-Mustansiriyah UniversityBaghdadIraq
  3. 3.College of EducationAl-Mustansiriyah UniversityBaghdadIraq

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