Morphological changes of sintered polydopamine coatings

Christopher T. Gibson, Christiaan R. Ridings, Andrew J. Blok, Cameron J. Shearer, Gunther G. Andersson, Amanda V. Ellis

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Polydopamine (PDA), produced from the self-polymerization of dopamine under alkaline conditions, is well known for its natural adhesive properties on a broad variety of surfaces. However, there is still ongoing controversy as to its growth, coverage and morphology characteristics. Here, we investigate the growth of PDA on a silicon substrate over various time periods (0-24 h) using a gentle rocking method. The samples were then post-heated at 150 °C under vacuum. Both the as-prepared and post-treated samples were examined with a combination of x-ray photoelectron, UV photoelectron, and neutral impact collision ion scattering spectroscopies, as well as atomic force microscopy. Results indicated that the PDA layer growth plateaus after 5 h, proceeding via island-growth, with incomplete coverage after 24 h. Heating PDA substrates resulted in sintering of the PDA islands to form a more homogenous surface coverage, indicating this is critical for the formation of smooth and homogenous coatings.

Original languageEnglish
Article number015016
Number of pages10
JournalSurface Topography: Metrology and Properties
Volume7
Issue number1
DOIs
Publication statusPublished - 25 Feb 2019

Keywords

  • atomic force microscopy
  • neutral impact collision ion scattering spectroscopy
  • polydopamine
  • UV photoelectron spectroscopy
  • x-ray photoelectron spectroscopy

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