Special appreciation is extended to Dr. Mark Johnson for contributing his TEM expertise. The authors gratefully thank the DOD NDSEG program and the ARO TOPS MURI for support. This work was also supported by the MIT MRSEC Program of the National Science Foundation under award DMR 94-00334.
High-Contrast Electrochromism and Controllable Dissolution of Assembled Prussian Blue/Polymer Nanocomposites†
Article first published online: 10 MAR 2004
Copyright © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 14, Issue 3, pages 224–232, March, 2004
How to Cite
DeLongchamp, D. M. and Hammond, P. T. (2004), High-Contrast Electrochromism and Controllable Dissolution of Assembled Prussian Blue/Polymer Nanocomposites. Adv. Funct. Mater., 14: 224–232. doi: 10.1002/adfm.200304507
- Issue published online: 10 MAR 2004
- Article first published online: 10 MAR 2004
- Manuscript Accepted: 5 NOV 2003
- Manuscript Received: 8 AUG 2003
- Drug delivery;
- Electrochromic materials;
- Layer-by-layer assembly;
To maintain the momentum and impact of the field, assembled materials systems must increasingly incorporate broad functionality to meet real-world applications. Here we describe nanocomposite films of specially synthesized inorganic Prussian blue (PB) nanoparticles and linear poly(ethylene imine) (LPEI) that possess the unusual functional combination of high-performance electrochromism for displays and controllable dissolution for drug delivery. Fabrication using layer-by-layer (LBL) assembly was followed by spectroelectrochemical characterization, allowing a full composition determination rarely achieved for LBL films. The electrochromic performance of thick LPEI/PB nanocomposites most relevant to applications surpassed that of inorganic PB films with competitive switching speed and superior contrast. Oxidation beyond the primary electrochromic transition removes nanoparticle ionization and can controllably dissolve the films. Because PB is non-toxic we suggest this mechanism for controlled in-vivo drug delivery. The performance and multifunctional quality of these nanocomposites promise a strong impact on flexible displays, electrochromic windows, and even biomedical devices.