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    Chemical reactivity of plasma polymerized allylamine (PPAA) thin films on Au and Si: Study of the thickness influence and aging of the films

    Year: 2011

    Journal: Surface and Coatings Technology, Volume 205, Supplement 2, 25 July 2011, Pages S462-S465, 20110906

    Authors: Moreau N. 1 8, Feron O. 2, Gallez B. 3, Masereel B. 4 8, Michiels C. 5 8, Borght T.V. 6 8, Rossi F. 7,Lucas S. 1 8

    Last authors: Stéphane Lucas

    Organizations: 1 University of Namur (FUNDP), Research Center for the Physics of Matter and Radiation (PMR), Namur, Belgium 2 Université Catholique de Louvain-FATH, Brussels, Belgium 3 Université Catholique de Louvain-CMFA, Brussels, Belgium 4 University of Namur (FUNDP)-DP, Namur, Belgium 5 University of Namur (FUNDP)-URBC, Namur, Belgium 6 University of Louvain-IMRE, Yvoir, Belgium 7 Joint Research Centre, IHCP, Ispra, Italy 8 NARILIS—Namur Research Institute for LIfe Sciences, Belgium

    Country: Belgium, Italy

    In this work, we investigate the surface reactivity of substrates coated with thin layers (estimated thickness ≤ 30 nm) of plasma polymerized allylamine films (PPAA), an amine-functionalized polymer deposited by plasma-enhanced chemical vapor deposition (PECVD) with radiofrequency (RF) discharges. Our results show that very thin layers, or islands, can retain on their surface molecules that are able to react through their NH2 functions. We have tested and assessed by X-Ray Electron Spectroscopy (XPS) and Quartz Crystal Microbalance (QCM) the surface density of chemical functions vs. layer thicknesses by using chemical derivatization with two types of agents: imine formation by a reaction of primary amine from the coating with aldehyde (Pentafluorobenzaldehyde, PFBA) and amide-bond formation by reaction with an activated carboxylic group (Succinimidyl Succinate Terminated Polyethylene glycol, EGSS). Results show that the PPAA coatings—even for very thin layers of a few nanometers—promote the chemisorption of the tagging molecules. The aging under air and evolution of reactive amine surface concentration with time under air are also presented.