Structural Characterization of a Spin-Assisted Colloid−Polyelectrolyte Assembly: Stratified Multilayer Thin Films
| Autor: | Matias Bargheer, Svetlana Santer, Steffen Mitzscherling, Helmut Möhwald, Wolfram Leitenberger, B. Tiersch, M. Kiel, Torsten K. Sievers |
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| Rok vydání: | 2010 |
| Předmět: |
Polymers
Analytical chemistry Nanoparticle Microscopy Atomic Force Electrolytes Colloid Microscopy Electron Transmission Monolayer Polyamines Electrochemistry General Materials Science Colloids Thin film Spectroscopy Chemistry X-Rays Surfaces and Interfaces Condensed Matter Physics Polyelectrolyte X-ray reflectivity Transmission electron microscopy Colloidal gold Spectrophotometry Ultraviolet Adsorption Gold Sulfonic Acids |
| Zdroj: | Langmuir. 26:18499-18502 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | The assembly of polyelectrolytes and gold nanoparticles yields stratified multilayers with very low roughness and high structural perfection. The films are prepared by spin-assisted layer-by-layer self-assembly (LbL) and are characterized by X-ray reflectivity (XRR), UV-vis spectroscopy, atomic force microscopy (AFM), and transmission electron microscopy (TEM). Typical structures have four repeat units, each of which consists of eight double layers (DL) of poly(sodium 4-styrenesulfonate)/poly(allylamine hydrochloride), one monolayer of gold nanoparticles (10 nm diameter), and another layer of poly(allylamine hydrochloride). XRR scans show small-angle Bragg peaks up to seventh order, evidencing the highly stratified structure. Pronounced Kiessig fringes indicate a low global roughness, which is confirmed by local AFM measurements. TEM images corroborate the layered structure in the growth direction and nicely show the distinct separation of the individual particle layers. An AFM study reveals the lateral gold particle distribution within one individual particle layer. Interestingly, the spin-assisted deposition of polyelectrolytes reduces the roughness induced by the particle layers, leading to self-healing of roughness defects and a rather perfect stratification. |
| Databáze: | OpenAIRE |
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