http://www.cnr.it/ontology/cnr/individuo/prodotto/ID167195

Seeded growth of asymmetric binary nanocrystals made of a semiconductor TiO2 rodlike section and a magnetic gamma-Fe2O3 spherical domain (Articolo in rivista)

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Seeded growth of asymmetric binary nanocrystals made of a semiconductor TiO2 rodlike section and a magnetic gamma-Fe2O3 spherical domain (Articolo in rivista) (literal)

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Alternative label

Buonsanti, R; Grillo, V; Carlino, E; Giannini, C; Curri, ML; Innocenti, C; Sangregorio, C; Achterhold, K; Parak, FG; Agostiano, A; Cozzoli, PD (2006)
Seeded growth of asymmetric binary nanocrystals made of a semiconductor TiO2 rodlike section and a magnetic gamma-Fe2O3 spherical domain
in Journal of the American Chemical Society (Print); ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

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Buonsanti, R; Grillo, V; Carlino, E; Giannini, C; Curri, ML; Innocenti, C; Sangregorio, C; Achterhold, K; Parak, FG; Agostiano, A; Cozzoli, PD (literal)

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Univ Bari, Dipartmento Chim, I-70126 Bari, Italy; INFM, CNR, TASC, Natl Lab, I-34012 Trieste, Italy; CNR, IC, I-70126 Bari, Italy; CNR, IPCF, I-70126 Bari, Italy; Univ Florence, LAMM, UdR, Dipartimento Chim,INSTM, I-50019 Sesto Fiorentino, Italy; Tech Univ Munich, Phys Dept E17, D-85747 Garching, Germany; INFM, CNR, Natl Nanotechnol Lab, Unita Ric IIT, I-73100 Lecce, Italy (literal)

Titolo

Seeded growth of asymmetric binary nanocrystals made of a semiconductor TiO2 rodlike section and a magnetic gamma-Fe2O3 spherical domain (literal)

Abstract

Asymmetric binary nanocrystals (BNCs), comprising one c-axis elongated anatase TiO2 section and one gamma-Fe2O3 spherical domain attached together, are synthesized by heterogeneous nucleation of iron oxide onto the longitudinal facets of TiO2 nanorods in a ternary surfactant mixture. The topologically controlled composition of the BNCs is ascertained by a combination of powder X-ray diffraction, Raman and Mossbauer spectroscopy, high-angle annular dark-field imaging, and high-resolution transmission electron microscopy lattice fringe mapping, while their size-dependent magnetic behavior is demonstrated by ac susceptibility measurements. The heteroepitaxial growth proceeds through a mechanism never observed before for colloidal nanoheterostructures: the two domains share a restricted and locally curved junction region, which accommodates efficiently the interfacial strain and retards the formation of misfit dislocations. It is believed that these BNCs, which combine the properties of two technologically relevant oxide materials, can pave the way to reinforced applications in several fields of nanoscience, such as in photocatalysis, in malignant cell treatments, and in nanocrystal assembly. (literal)

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