Dense arrays of vertically aligned ZnO nanorods have been grown onto either silver or gold seedless substrates trough a simple hydrothermal method by exploiting the galvanic effect between the substrate and metallic parts. The nanorods exhibit larger bases and more defined hexagonal shapes, in comparison with standard non-galvanic wet-chemistry synthesis. X-ray diffraction (XRD) shows that the iron contamination, associated with the galvanic contact, significantly improves the in-plane compatibility of ZnO with the Au and Ag cubic lattice. Photoluminescence (PL) measurements indicate that the contamination does not affect the number density of localized defects, but lowers their energy levels uniformly; differently, the band-edge emission is not altered appreciably. Finally, we have found that the ZnO hetero-nucleation by galvanic effect initiates at different times in different sites of the substrate area. Our results can be useful for the fabrication of high performance piezonanodevices comprising high-density metal-to-ZnO nanoscaled junctions without intermediate polycrystalline layers.

Scarpellini, D., Paoloni, S., Medaglia, P.g., Pizzoferrato, R., Orsini, A., Falconi, C. (2015). Structural and optical properties of dense vertically aligned ZnO nanorods grown onto silver and gold thin films by galvanic effect with iron contamination. MATERIALS RESEARCH BULLETIN, 65(May 2015), 231-237 [10.1016/j.materresbull.2015.01.059].

Structural and optical properties of dense vertically aligned ZnO nanorods grown onto silver and gold thin films by galvanic effect with iron contamination

PAOLONI, STEFANO;MEDAGLIA, PIER GIANNI;PIZZOFERRATO, ROBERTO;ORSINI, ANDREA;FALCONI, CHRISTIAN
2015

Abstract

Dense arrays of vertically aligned ZnO nanorods have been grown onto either silver or gold seedless substrates trough a simple hydrothermal method by exploiting the galvanic effect between the substrate and metallic parts. The nanorods exhibit larger bases and more defined hexagonal shapes, in comparison with standard non-galvanic wet-chemistry synthesis. X-ray diffraction (XRD) shows that the iron contamination, associated with the galvanic contact, significantly improves the in-plane compatibility of ZnO with the Au and Ag cubic lattice. Photoluminescence (PL) measurements indicate that the contamination does not affect the number density of localized defects, but lowers their energy levels uniformly; differently, the band-edge emission is not altered appreciably. Finally, we have found that the ZnO hetero-nucleation by galvanic effect initiates at different times in different sites of the substrate area. Our results can be useful for the fabrication of high performance piezonanodevices comprising high-density metal-to-ZnO nanoscaled junctions without intermediate polycrystalline layers.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
English
Con Impact Factor ISI
Crystal growth; Crystal structure; Luminescence; Nanostructures; X-ray diffraction
http://dx.medra.org/10.1016/j.materresbull.2015.01.059
Scarpellini, D., Paoloni, S., Medaglia, P.g., Pizzoferrato, R., Orsini, A., Falconi, C. (2015). Structural and optical properties of dense vertically aligned ZnO nanorods grown onto silver and gold thin films by galvanic effect with iron contamination. MATERIALS RESEARCH BULLETIN, 65(May 2015), 231-237 [10.1016/j.materresbull.2015.01.059].
Scarpellini, D; Paoloni, S; Medaglia, Pg; Pizzoferrato, R; Orsini, A; Falconi, C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/113154
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