期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 18, 期 1, 页码 -出版社
MDPI AG
DOI: 10.3390/ijms18010014
关键词
polydopamine; melanin; thin film; metal cation; dopamine oxidation
资金
- Defense Advanced Research Projects Agency [D14AP00040]
- Charles Stark Draper Laboratory University Research & Development Program
- Pennsylvania Infrastructure Technology Alliance (PITA)
- Pittsburgh Innovation Works
- Carnegie Mellon University School of Engineering
- [MCF-677785]
The facile preparation of conformal polydopamine (PDA) films on broad classes of materials has prompted extensive research into a wide variety of potential applications for PDA. The constituent molecular species in PDA exhibit diverse chemical moieties, and therefore highly variable properties of PDA-based devices may evolve with post-processing conditions. Here we report the use of redox-inactive cations for oxidative post-processing of deposited PDA films. PDA films incubated in alkaline CaCl2 solutions exhibit accelerated oxidative evolution in a dose-dependent manner. PDA films incubated in CaCl2 solutions exhibit 53% of the oxidative charge transfer compared to pristine PDA films. Carboxylic acid groups generated from the oxidation process lower the isoelectric point of PDA films from pH = 4.0 +/- 0.2 to pH = 3.1 +/- 0.3. PDA films exposed to CaCl2 solutions during post-processing also enhance Fe2+/Fe3+ chelation compared to pristine PDA films. These data illustrate that the molecular heterogeneity and non-equilibrium character of as-deposited PDA films afford control over the final composition by choosing post-processing conditions, but also demands forethought into how the performance of PDA-incorporated devices may change over time in salt solutions.
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