Self-assembly and photopolymerization of a novel quaternary-ammonium functionalized diacetylene on noble metal nanoparticles: A comparative study
| Autor: | Maria Isabel Martinez-Espinoza, Marina Alloisio, Sergio Thea, Massimo Maccagno |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Scanning electron microscopy (SEM) General Physics and Astronomy Nanoparticle 02 engineering and technology Core-shell assembly engineering.material 010402 general chemistry 01 natural sciences Silver nanoparticle chemistry.chemical_compound Organic chemistry Noble metal nanoparticles Noble metal nanoparticles Polydiacetylenes Core-shell assembly Spectroscopic characterization Scanning electron microscopy (SEM) Thermogravimetric analysis (TGA) Diacetylene Thermogravimetric analysis (TGA) Cationic polymerization Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Monomer Photopolymer chemistry Chemical engineering Polymerization engineering Noble metal Spectroscopic characterization Polydiacetylenes 0210 nano-technology |
| Popis: | Stable hydrosols of gold and silver nanoparticles coated with the quaternary-ammonium group endowed diacetylene DAAMM (N,N,N-trimethyl-3-(pentacosa-10,12-diynamido)propan-1-ammonium) were obtained through a ligand-exchange reaction leaving the morphology of the pristine cores unmodified. Photopolymerization of the chemisorbed diacetylene shell occurred in both red and blue phases thanks to the presence of internal, H-bondable amide functions in the monomer chain, which are supposed to help the formation of a packed bilayer on the metal surfaces. Multidisciplinary characterization of the polymerized samples, including spectroscopic, morphological and thermal techniques, highlighted that differences occur in the polymerization process on gold and silver nanoparticles under different experimental conditions, suggesting a higher affinity of the trimethylammonium headgroup for gold substrates in acidic media. With respect to the extensively investigated PCDA (pentacosa-10,12-diynoic acid), DAAMM showed reduced capability of photogenerating thick polymer shells, especially in the more delocalized blue form, probably because of the inefficiency of the cationic monomer to form the multi-bilayered architecture typical of the highly-performing, carboxyl-terminated diacetylene. On the other end, the inner cross-linked structure gives to poly(DAAMM)-coated nanohybrids increased stability in water with respect to self-assembled counterparts deriving from saturated cationic surfactants, making them a promising sensing platform for rapid and cost effective assays of real samples. |
| Databáze: | OpenAIRE |
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