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Title: Covalent molecular assembly of multilayer dendrimer ultrathin films in supercritical medium
Authors: Puniredd, S.R.
Srinivasan, M.P. 
Keywords: Covalent molecular assembly
Supercritical carbon dioxide
Ultrathin films
Issue Date: 1-Feb-2007
Source: Puniredd, S.R., Srinivasan, M.P. (2007-02-01). Covalent molecular assembly of multilayer dendrimer ultrathin films in supercritical medium. Journal of Colloid and Interface Science 306 (1) : 118-127. ScholarBank@NUS Repository.
Abstract: Ultrathin films containing dendrimers are fabricated on amine- and anhydride-derivatized silicon dioxide surface through alternate layer-by-layer (LbL) assembly of pyromellitic dianhydride (PMDA) and poly(amidoamine) (PAMAM) dendrimer in supercritical carbon dioxide (SCCO2) with interlayer linkage established by covalent bonds. X-ray photoelectron and UV-visible absorption spectroscopies, atomic force microscopy (AFM), and ellipsometry were employed to study the interfacial chemistry, growth, morphology, and thickness of the assembled film. XPS analysis suggests that the PMDA/PAMAM interlayer covalent bond is established to completion, and functional surfaces for immobilization of the next layer are available after deposition of each layer. UV-visible absorption and ellipsometry revealed layer-by-layer growth of the film. The functional property film as a porous matrix was manifested in the reduction of the refractive index upon introduction of the dendrimer. © 2006 Elsevier Inc. All rights reserved.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2006.09.051
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