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      Self-assembled peptide nanofiber templated one-dimensional gold nanostructures exhibiting resistive switching

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      Author
      Acar, H.
      Genc, R.
      Urel, M.
      Erkal, T. S.
      Dana, A.
      Güler, Mustafa O.
      Date
      2012
      Source Title
      Langmuir
      Print ISSN
      0743-7463
      Electronic ISSN
      1520-5827
      Publisher
      American Chemical Society
      Volume
      28
      Issue
      47
      Pages
      16347 - 16354
      Language
      English
      Type
      Article
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      Abstract
      An amyloid-like peptide molecule self-assembling into one-dimensional nanofiber structure in ethanol was designed and synthesized with functional groups that can bind to gold ions. The peptide nanofibers were used as templates for nucleation and growth of one-dimensional gold nanostructures in the presence of ascorbic acid as reducing agent. We performed multistep seed-mediated synthesis of gold nanoparticles by changing peptide/gold precursor and peptide/reducing agent ratios. Gold nanostructures with a wide range of morphologies such as smooth nanowires, noodle-like one-dimensional nanostructures, and uniform aggregates of spherical nanoparticles were synthesized by use of an environmentally friendly synthesis method. Nanoscale electrical properties of gold-peptide nanofibers were investigated using atomic force microscopy. Bias dependent current (IV) measurements on thin films of gold-peptide nanofiber hybrid revealed tunneling dominated transport and resistive switching. Gold-peptide nanofiber composite nanostructures can provide insight into electrical conduction in biomolecular/inorganic composites, highlighting their potential applications in electronics and optics. © 2012 American Chemical Society.
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      http://hdl.handle.net/11693/21257
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/la3035215
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      • Institute of Materials Science and Nanotechnology (UNAM) 1858
      • Nanotechnology Research Center (NANOTAM) 1038
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