Patterned Layers of a Semiconducting Polymer via Imprinting and Microwave-Assisted Grafting
| Autor: | Isaac W. Moran, Sarav B. Jhaveri, Kenneth R. Carter |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Magnetic Resonance Spectroscopy
Fabrication Materials science Polymers Biocompatible Materials Fluorene Methacrylate Coupling reaction law.invention Biomaterials Polyfluorene chemistry.chemical_compound Optical microscope law Polymer chemistry Photography General Materials Science Microwaves Fluorenes General Chemistry Fluorescence Photopolymer Semiconductors chemistry Chemical engineering Methacrylates Printing Biotechnology |
| Zdroj: | Small. 4:1176-1182 |
| ISSN: | 1613-6829 1613-6810 |
| DOI: | 10.1002/smll.200701251 |
| Popis: | Enhancements in both the rate and extent of grafting of poly(9,9'-n-dihexyl fluorene) (PDHF) onto flat and nanopatterned crosslinked photopolymer films are described. Reactivity of the surfaces toward grafting via the Yamamoto-type Ni(0)-mediated coupling reaction is increased by synthesizing and incorporating 2,7-dibromo-9-fluorenyl methacrylate (DBFM, 2) as a new grafting agent. Varying the concentration of surface-embedded DBFM is shown to control both overall graft formation and fluorescence with a maximum thickness of up to 30 nm and peak emission at 407 nm for 40 wt% loading. In addition, microwave irradiation is introduced as an effective means to drive graft formation and thus allows fabrication of PDHF-functionalized surfaces in as little as 30 min. Both forms of improvement are extended to DBFM-embedded, nanocontact-molded features ranging in size from 100 microm to 100 nm in width and 60 nm in height. Microwave-assisted grafting from these patterned surfaces produces fluorescent features as imaged by optical microscopy and a corresponding increase in feature height as measured by atomic force microscopy. |
| Databáze: | OpenAIRE |
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