title: One-Pot Hybrid SnO2/Poly(methyl methacrylate) Nanocomposite Formation through Pulsed Laser Irradiation.
abstract: The localized in situ formation of tin dioxide (SnO2) nanoparticles embedded in poly(methyl methacrylate) (PMMA) films is presented. This is achieved by the photoinduced conversion of the tin acetate precursor included in polymeric films, through controlled UV or visible pulsed laser irradiation at λ=355 and 532 nm, respectively. The evolution of the formation of nanoparticles is followed by UV/Vis spectroscopy and shows that their growth is affected in different ways by the laser pulses at the two applied wavelengths. This, in combination with electron microscopy analysis, reveals that, depending on the irradiation wavelength, the size of the nanoparticles in the final nanocomposites differs. This difference is attributed to distinct mechanistic pathways that lead to the synthesis of small nanoparticles (from 1.5 to 4.5 nm) at λ=355 nm, whereas bigger ones (from 5 to 16 nm) are formed at λ=532 nm. At the same time, structural studies with both X-ray and electron diffraction measurements demonstrate the crystallinity of SnO2nanoparticles in both cases, whereas XPS analysis confirms the light-induced oxidation of tin acetate into SnO2. Taken all together, it is demonstrated that the pulsed laser irradiation at λ=355 and 532 nm leads to the formation of SnO2nanoparticles with defined features highly dispersed in PMMA solid matrices.
authors.affiliation: Smart Materials, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
authors.forename: Gianvito
authors.identifier: http://orcid.org/0000-0002-8973-3109
authors.initials: G
authors.lastname: Caputo
authors.affiliation: Electron Microscopy, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
authors.forename: Alice
authors.initials: A
authors.lastname: Scarpellini
authors.affiliation: Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
authors.forename: Francisco
authors.initials: F
authors.lastname: Palazon
authors.affiliation: Smart Materials, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
authors.forename: Athanassia
authors.initials: A
authors.lastname: Athanassiou
authors.affiliation: Smart Materials, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
authors.forename: Despina
authors.initials: D
authors.lastname: Fragouli
keywords: materials science; nanoparticles; photochemistry; polymers; thin films