Structured Polymer Brushes on Silicon Carbide
2010 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 22, no 1, 272-278 p.Article in journal (Refereed) Published
A straightforward method is presented for the preparation of homogeneous as well as structured polymer brushes on SiC substrates. The self-initiated photografting and photopolymerization (SIPGP) of styrene and N,N-dimethylaminoethyl methacrylate (MAEMA) allows the preparation of polymer brush layers directly and selectively onto C—OH terminated (000) 6H-SiC surfaces in a single step reaction. In contrast, the analogous reaction on Si—OH terminated (0001) 6H-SiC does not occur. The reactivity contrast between Si—OH and C—OH terminated crystal faces for SIPGP was studied using the density functional theory method which showed a higher SiO—H bond dissociation energy for hydrogen abstraction on the Si-polar relative to the C-polar crystal face. Furthermore, structured polymer brushes on the submicrometer scale could be prepared by the carbon templating (CT) technique on Si—OH terminated (0001) 6H-SiC surfaces. First, an ultrathin template layer was formed by electron beam induced carbon deposition (EBCD) on SiC by means of a focused electron beam. Amplification of the template by SIPGP resulted in polymer brush structures with controlled three-dimensional shapes. The effect of the applied electron dose as well as the initial lateral structure size on the brush layer morphology was investigated.
Place, publisher, year, edition, pages
American Chemical Society , 2010. Vol. 22, no 1, 272-278 p.
Research subject Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-120757DOI: 10.1021/cm903051jISI: 000273265500038OAI: oai:DiVA.org:uu-120757DiVA: diva2:303953