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      Photopatterning of PMMA films with gold nanoparticles: diffusion of AuCl4-ions

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      Author(s)
      Yilmaz, E.
      Ertas, G.
      Bengu, E.
      Süzer, Şefik
      Date
      2010
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      -1932
      Electronic ISSN
      1932-7455
      Volume
      114
      Issue
      43
      Pages
      18401 - 18406
      Language
      English
      Type
      Article
      Item Usage Stats
      146
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      113
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      Abstract
      Photopatterning of poly(methyl methacrylate) (PMMA) films is performed by UV irradiation of the polymer films containing uniformly distributed AuCl 4 - ions. The process reduces the gold ions and leads to production of Au nanoparticles in the irradiated regions at room temperature (RT). Resulting films are investigated with scanning electron microscopy, which revealed, in addition to regions with gold nanoparticles, the presence of "ion-depleted regions". These regions are formed at RT and within the rigid polymer matrix by diffusion of gold ions toward the irradiated regions, ending up with no or very little gold moieties, which are important for prevention of delayed processes for postgeneration of unwanted features, if and when such materials are utilized for device production. Further investigations performed by fluorescence and Raman measurements and XPS mapping give additional evidence supporting the existence of such regions. Similar regions are also observed within the poly(vinyl alcohol) (PVAL) films. The ion-depleted regions are about 10 μm wide, which is a significant length for the metal ions to travel through a rigid matrix like PMMA (or PVAL) at room temperature and raises important questions as to the diffusion mechanism(s) of the metal ions and to the nature of the driving force(s).
      Keywords
      Au nanoparticle
      Diffusion mechanisms
      Driving forces
      Gold ions
      Gold Nanoparticles
      Matrix
      Photo patterning
      PMMA films
      Raman measurements
      Room temperature
      UV irradiation
      XPS
      Diffusion
      Esters
      Metal ions
      Nanoparticles
      Polymer films
      Scanning electron microscopy
      Gold
      Permalink
      http://hdl.handle.net/11693/22142
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/jp106672f
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