TY - JOUR
T1 - Morphological changes of sintered polydopamine coatings
AU - Gibson, Christopher T.
AU - Ridings, Christiaan R.
AU - Blok, Andrew J.
AU - Shearer, Cameron J.
AU - Andersson, Gunther G.
AU - Ellis, Amanda V.
PY - 2019/2/25
Y1 - 2019/2/25
N2 - 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.
AB - 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.
KW - atomic force microscopy
KW - neutral impact collision ion scattering spectroscopy
KW - polydopamine
KW - UV photoelectron spectroscopy
KW - x-ray photoelectron spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85067798322&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/ARC/FT130100211
U2 - 10.1088/2051-672X/ab06eb
DO - 10.1088/2051-672X/ab06eb
M3 - Article
AN - SCOPUS:85067798322
VL - 7
JO - Surface Topography: Metrology and Properties
JF - Surface Topography: Metrology and Properties
SN - 2051-672X
IS - 1
M1 - 015016
ER -