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      Dynamic XPS measurements of ultrathin polyelectrolyte films containing antibacterial Ag–Cu nanoparticles

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      Author(s)
      Taner-Camcı, M.
      Süzer, Şefik
      Date
      2014
      Source Title
      Journal of Vacuum Science & Technology A
      Print ISSN
      0734-2101
      Electronic ISSN
      1944-2807
      Publisher
      American Vacuum Society
      Volume
      32
      Issue
      2
      Pages
      021510-1 - 021510-5
      Language
      English
      Type
      Article
      Item Usage Stats
      118
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      Abstract
      Ultrathin films consisting of polyelectrolyte layers prepared by layer-by-layer deposition technique and containing also Ag and Cu nanoparticles exhibit superior antibacterial activity toward Escherichia coli. These films have been investigated with XPS measurements under square wave excitation at two different frequencies, in order to further our understanding about the chemical/physical nature of the nanoparticles. Dubbed as dynamical XPS, such measurements bring out similarities and differences among the surface structures by correlating the binding energy shifts of the corresponding XPS peaks. Accordingly, it is observed that the Cu2p, Ag3d of the metal nanoparticles, and S2p of cysteine, the stabilizer and the capping agent, exhibit similar shifts. On the other hand, the C1s, N1s, and S2p peaks of the polyelectrolyte layers shift differently. This finding leads us the claim that the Ag and Cu atoms are in a nanoalloy structure, capped with cystein, as opposed to phase separated entities.
      Keywords
      Metal Nanoparticles
      Electron-spectroscopy
      Catalysis
      Charge
      Permalink
      http://hdl.handle.net/11693/10932
      Published Version (Please cite this version)
      http://dx.doi.org/10.1116/1.4862155
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      • Department of Chemistry 640
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