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      Assembly kinetics of nanocrystals via peptide hybridization

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      Author
      Seker U.O.S.
      Zengin, G.
      Tamerler, C.
      Sarikaya, M.
      Demir, Hilmi Volkan
      Date
      2011-03-16
      Source Title
      Langmuir
      Print ISSN
      0743-7463
      Publisher
      American Chemical Society
      Volume
      27
      Issue
      8
      Pages
      4867 - 4872
      Language
      English
      Type
      Article
      Item Usage Stats
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      149
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      Abstract
      The assembly kinetics of colloidal semiconductor quantum dots (QDs) on solid inorganic surfaces is of fundamental importance for implementation of their solid-state devices. Herein an inorganic binding peptide, silica binding QBP1, was utilized for the self-assembly of nanocrystal quantum dots on silica surface as a smart molecular linker. The QD binding kinetics was studied comparatively in three different cases: first, QD adsorption with no functionalization of substrate or QD surface; second, QD adsorption on QBP1-modified surface; and, finally, adsorption of QBP1-functionalized QD on silica surface. The surface modification of QDs with QBP1 enabled 79.3-fold enhancement in QD binding affinity, while modification of a silica surface with QBP1 led to only 3.3-fold enhancement. The fluorescence microscopy images also supported a coherent assembly with correspondingly increased binding affinity. Decoration of QDs with inorganic peptides was shown to increase the amount of surface bound QDs dramatically compared to the conventional methods. These results offer new opportunities for the assembly of QDs on solid surfaces for future device applications.
      Keywords
      Surface-plasmon resonance
      Quartz-crystal microbalance
      Gold-binding polypeptide
      Containing alkylthiolate monolayers
      Quantum dots
      Adsorption behavior
      Coupled water
      Wild-type
      Specificity
      Biosensors
      Permalink
      http://hdl.handle.net/11693/12202
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/la104942t
      Collections
      • Department of Electrical and Electronics Engineering 3597
      • Department of Physics 2329
      • Institute of Materials Science and Nanotechnology (UNAM) 1831
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