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Influence of natural oxidation on the surface enhancement effect of silver nanoparticle films

  • Shu Zhang
  • Qun Wang
  • Chuyun Deng
  • Wanyun Ma
  • Jia-Lin Sun
Research Paper

Abstract

Silver nanomaterials are often used as surface enhancement substrates even though silver is easily oxidized in air. In this paper, we investigate the influence of natural oxidation on the surface enhancement effect of silver nanoparticle (AgNP) films. The AgNP films were prepared by the vacuum thermal evaporation method, and the AgNP size range was 10–100 nm. Changes in the AgNP film thickness, surface morphology, particle size, and roughness with oxidation time were continuously measured with atomic force microscopy for 2 weeks. A detailed analysis of these parameters is presented. In addition, we used Rhodamine 6G to examine the surface enhancement effect of the AgNP films with different oxidation times. The results showed that the intensity of both the Raman and fluorescence signals increased and approximately periodically oscillated with increasing oxidation time. Here, we qualitatively discuss the mechanism of the influence of natural oxidation on the surface enhancement effect of silver nanostructures, which could provide a feasible way to improve the surface enhancement performance of silver nanomaterial substrates.

Keywords

Silver nanoparticle film Natural oxidation Surface enhancement effect Coating 

Notes

Acknowledgments

This work was supported by the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20120002110024) and the National Natural Science Foundation of China (Nos. 11374172 and 11374180).

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.State Key Laboratory of Low-Dimensional Quantum Physics, Department of PhysicsTsinghua UniversityBeijingChina
  2. 2.College of InformationBeijing City UniversityBeijingChina
  3. 3.Science SchoolNational University of Defense TechnologyChangshaChina
  4. 4.Collaborative Innovation Center of Quantum MatterBeijingChina

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