Oxygen Concentration Control of Dopamine-Induced High Uniformity Surface Coating Chemistry

TitleOxygen Concentration Control of Dopamine-Induced High Uniformity Surface Coating Chemistry
Publication TypeJournal Article
Year of Publication2013
AuthorsKim, Hyo Won, Bryan D. McCloskey, Tae Hwan Choi, Changho Lee, Min-Joung Kim, Benny D. Freeman, and Ho Bum Park
JournalACS Applied Materials & Interfaces
Pagination233 - 238
Date Published01/2013
KeywordsAnti-fouling, dopamine, homogeneous coating, membrane, Surface modification

Material surface engineering has attracted great interest in important applications, including electronics, biomedicine, and membranes. More recently, dopamine has been widely exploited in solution-based chemistry to direct facile surface modification. However, unsolved questions remain about the chemical identity of the final products, their deposition kinetics and their binding mechanism. In particular, the dopamine oxidation reaction kinetics is a key to improving surface modification efficiency. Here, we demonstrate that high O2 concentrations in the dopamine solution lead to highly homogeneous, thin layer deposition on any material surfaces via accelerated reaction kinetics, elucidated by Le Chatelier’s principle toward dopamine oxidation steps in a Michael-addition reaction. As a result, highly uniform, ultra-smooth modified surfaces are achieved in much shorter deposition times. This finding provides new insights into the effect of reaction kinetics and molecular geometry on the uniformity of modifications for surface engineering techniques.

Short TitleACS Appl. Mater. Interfaces