Journal article

Thermally Induced Charge Reversal of Layer-by-Layer Assembled Single-Component Polymer Films

Joseph J Richardson, Blaise L Tardy, Hirotaka Ejima, Junling Guo, Jiwei Cui, Kang Liang, Gwan H Choi, Pil J Yoo, Bruno G De Geest, Frank Caruso

ACS APPLIED MATERIALS & INTERFACES | AMER CHEMICAL SOC | Published : 2016

Abstract

Temperature can be harnessed to engineer unique properties for materials useful in various contexts and has been shown to affect the layer-by-layer (LbL) assembly of polymer thin films and cause physical changes in preassembled polymer thin films. Herein we demonstrate that exposure to relatively low temperatures (≤ 100 °C) can induce physicochemical changes in cationic polymer thin films. The surface charge of polymer films containing primary and secondary amines reverses after heating (from positive to negative), and different characterization techniques are used to show that the change in surface charge is related to oxidation of the polymer that specifically occurs in the thin film state..

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Grants

Awarded by Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology


Awarded by ARC Council


Funding Acknowledgements

This research was conducted and funded by the Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology (project number CE140100036). This work was also supported by the ARC Council under the Australian Laureate Fellowship (F.C., FL120100030) and Discovery Project (F.C., DP130101846) schemes. This work was performed in part at the Materials Characterisation and Fabrication Platform (MCFP) at the University of Melbourne and the Victorian Node of the Australian National Fabrication Facility (ANFF).