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Confinement of Semiconductor ZnO Nanoparticles in Block Copolymer Nanostructure

TitoloConfinement of Semiconductor ZnO Nanoparticles in Block Copolymer Nanostructure
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2017
AutoriMalafronte, A., Auriemma F., Di Girolamo R., Sasso C., Diletto C., Di Mauro A.E., Fanizza E., Morvillo Pasquale, Rodriguez A.M., Muñoz-Garcia A.B., Pavone M., and De Rosa C.
RivistaJournal of Physical Chemistry C
Volume121
Paginazione16617-16628
ISSN19327447
Parole chiaveBlock copolymers, Current voltage measurement, Density functional theory, Esters, Heterogeneous interfaces, Hybrid nanocomposites, II-VI semiconductors, Metal nanoparticles, N-type semiconductors, Nanocomposite films, Nanocomposites, Nanoparticles, Nanostructured matrix, Nanostructures, Oxide semiconductors, Polymer matrix composites, Polymethyl methacrylates, Polystyrene-b-poly(methyl methacrylate), Selective inclusion, Threshold concentrations, Zinc oxide
Abstract

The morphology and the electrical properties of hybrid nanocomposites characterized by the dispersion of ZnO nanoparticles (NPs), a n-type semiconductor, within an organic nanostructured matrix of polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) block copolymer are presented. A selective inclusion of NPs only into the lamellar PS nanodomains of the block copolymer matrix has been achieved by synthetizing ZnO NPs coated with n-hexadecylamine (HDA) and tert-butylphosphonic acid (TBPA) molecules and subsequent thermal annealing of the nanocomposites ZnO NPs/PS-b-PMMA. Thermal treatments have allowed obtaining in one step the vertical orientation of the lamellar BCP nanodomains and the migration of the NPs to the PS domains, resulting in the formation of nanocomposites characterized by a precise control of the position of n-semiconductor ZnO NPs. Current-voltage measurements on the nanocomposites have indicated the presence of continuous path of charge carriers in the BCP films when the ZnO NPs content is above a threshold concentration. The experimental results have allowed the setup and validation of a theoretical protocol to study heterogeneous interfaces. In particular, the interaction of ZnO most stable nonpolar surface with prototypical capping agents has been analyzed by using density functional theory (DFT) calculations. © 2017 American Chemical Society.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85026852126&doi=10.1021%2facs.jpcc.7b05125&partnerID=40&md5=54faae641f9abf8868d4536eb77f408e
DOI10.1021/acs.jpcc.7b05125
Citation KeyMalafronte201716617