Triazene UV-triggered photogeneration of silver/gold nanoparticles in block copolymer templates
- 251 Downloads
This article describes an attractive way to in situ create noble metal nanoparticles in block copolymer matrixes through the UV-triggered photodecomposition of the photolabile triazene units without the use of any conventional reducing agent. The poly(isodecyl methacrylate-co-triazene urethane methacrylate) random copolymer containing pendent photocleavable triazene junctions (COP-1) was synthesized under RAFT conditions and subsequently employed as macroinitiator to obtain a block copolymer, namely poly(isodecyl methacrylate-co-triazene urethane methacrylate)-block-poly(acrylic acid) (COP-2). The photogeneration of silver/gold metal nanoparticles (NPs) from noble metal precursors (1 wt% AgNO3 or AuBr3 metal salts) induced through the UV decomposition of triazene units with the formation of some radical active species was monitored in solution and thin films. The in situ growth of Ag/Au nanostructures into polymer matrixes for which the light is a key element has been confirmed by UV spectroscopy and TEM analysis. The TEM images allowed the visualization of the silver NPs (sizes of 4–16 nm in COP-1 and of 2–6 nm in COP-2) as well as of the gold NPs (sizes between 10 and 20 nm in COP-1 and from 15 to 25 nm in COP-2), which are mainly spherical in shape, even though there is some triangular or hexagonal gold nanoparticles.
KeywordsTriazene block copolymer UV irradiation Photodecomposition Silver/gold nanoparticles Nanocomposite materials
This work was financially supported by CNCSIS-UEFISCDI, project number PN-II-ID-PCE-2011-3-0164 (40/5.10.2011).
- Chibac AL, Melinte V, Buruiana T, Mangalagiu I, Buruiana EC (2015) Preparation of photocrosslinked sol-gel composites based on urethane-acrylic matrix, silsesquioxane sequences, TiO2, and Ag/Au NPs for use in photocatalytic applications. J Polym Sci Part A 53:1189–1204. doi: 10.1002/pola.27548 CrossRefGoogle Scholar
- Leiva A, Fuentes I, Bossel E, Urzua M, Mendez M, Pino M, Radic D, Marquez V, Gonzalez-Nilo FD (2014) Block copolymers in the synthesis of gold nanoparticles. Two new approaches: copolymer aggregates as reductants and stabilizers and simultaneous formation of copolymer aggregates and gold nanoparticles. J Polym Sci Part A 52:3069–3079. doi: 10.1002/pola.27354 CrossRefGoogle Scholar
- Nuyken O, Dahn U (1997) New polyesters with photosensitive backbones based on the triazene unit. J Polym Sci Part A 35:3017–3025. doi: 10.1002/(SICI)1099-0518(199710)35:14<3017:AID-POLA23>3.0.CO;2-K CrossRefGoogle Scholar
- Schmidl G, Dellith J, Schneidewind H, Zopf D, Stranik O, Gawlik A, Anders S, Tympel V, Katzer C, Schmidl F, Fritzsche W (2015) Formation and characterization of silver nanoparticles embedded in optical transparent materials for plasmonic sensor surfaces. Mater Sci Eng B 193:207–216. doi: 10.1016/j.mseb.2014.12.001 CrossRefGoogle Scholar