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Type: Journal article
Title: Morphological changes of sintered polydopamine coatings
Author: Gibson, C.T.
Ridings, C.R.
Blok, A.J.
Shearer, C.J.
Andersson, G.G.
Ellis, A.V.
Citation: Surface Topography: Metrology and Properties, 2019; 7(1):015016-1-015016-10
Publisher: IOP Publishing
Issue Date: 2019
ISSN: 2051-672X
Statement of
Christopher T Gibson, Christiaan R Ridings, Andrew J Blok, Cameron J Shearer, Gunther G Andersson and Amanda V Ellis
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.
Keywords: Neutral impact collision ion scattering spectroscopy; atomic force microscopy; UV photoelectron spectroscopy; x-ray photoelectron spectroscop; polydopamine
Rights: © 2019 IOP Publishing Ltd.
RMID: 0030110551
DOI: 10.1088/2051-672X/ab06eb
Appears in Collections:Mechanical Engineering publications

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