Internal Structure of Polyelectrolyte Multilayers Probed via Neutral Impact Collision Ion Scattering Spectroscopy

Layering in polyelectrolyte multilayer films has been studied by neutral impact collision ion scattering spectroscopy. The method affords a direct look at vertical ordering within these films at the nanometer scale. By labeling certain polyelectrolyte layers with heavy atom (Ru) probes, sufficient c...

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Veröffentlicht in:Langmuir 2005-03, Vol.21 (6), p.2598-2604
Hauptverfasser: Tan, Hazel L, Krebs, Thomas, Andersson, Gunther, Neff, David, Norton, Michael, Morgner, Harald, Van Patten, P. Gregory
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container_end_page 2604
container_issue 6
container_start_page 2598
container_title Langmuir
container_volume 21
creator Tan, Hazel L
Krebs, Thomas
Andersson, Gunther
Neff, David
Norton, Michael
Morgner, Harald
Van Patten, P. Gregory
description Layering in polyelectrolyte multilayer films has been studied by neutral impact collision ion scattering spectroscopy. The method affords a direct look at vertical ordering within these films at the nanometer scale. By labeling certain polyelectrolyte layers with heavy atom (Ru) probes, sufficient contrast has been obtained to visualize and quantify the distribution of these labeled polyelectrolytes throughout the film. The results indicate that the materials under investigation here produce linear film growth with very limited layer interpenetration. The interdigitation length between neighboring layers within the film is measured as 3.9 nm, which is approximately 1.4 times the thickness of an individual polycation/polyanion pair and is slightly less than the measured air/film roughness (4.7 nm). Detailed analysis shows that under the conditions used and at the depths probed in this study, the observed layer thickness is not signficantly broadened by either instrumental or stochastic factors.
doi_str_mv 10.1021/la047423p
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subjects Chemistry
Exact sciences and technology
General and physical chemistry
title Internal Structure of Polyelectrolyte Multilayers Probed via Neutral Impact Collision Ion Scattering Spectroscopy
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