Artículo
Seed-free growth of strongly UV emitting self-supported hybrid ZnO nanowire/graphite membranes
Fecha de publicación:
03/2020
Editorial:
Elsevier Science
Revista:
Materials Letters
ISSN:
0167-577X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Self-supported membranes consisting of entangled 2 to 6 μm long ZnO nanowires (NWs) on graphite with excellent UV emission were fabricated by a vapor transport technique at high temperature in a tubular furnace. The NWs grew on catalyst-free graphite flakes that had been mechanically compacted within an alumina boat crucible (the “substrate crucible”). The self-supported ZnO NW/graphite membrane detached spontaneously from the graphite substrate during the cooling stage after NW growth. The inversion of the substrate crucible orientation to an upside down position (usually used by our group for rigid substrates) resulted in strong reductions of the UV/visible emission ratio; by a factor of ~20 for NWs grown on compacted graphite and of ~1000 for NWs grown on Au-catalyzed Si wafers. Simulations of the transport fluid dynamics within the synthesis tube demonstrate that the substrate holder shape and substrate position within the holder play crucial roles in the reduction of precursor velocities, which is likely a key factor for achieving the long entangled NWs with enhanced UV/visible emission ratios that conform the self-supported ZnO NW/graphite membranes.
Palabras clave:
ZnO
,
SEED-FREE
,
NANOWIRE GROWTH
,
VAPOR TRANSPORT
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Colecciones
Articulos (INFINOA)
Articulos de INSTITUTO DE FISICA DEL NOROESTE ARGENTINO
Articulos de INSTITUTO DE FISICA DEL NOROESTE ARGENTINO
Citación
Tosi, Ezequiel; Marín Ramírez, Oscar Alonso; Tirado, Monica Cecilia; Comedi, David Mario; Seed-free growth of strongly UV emitting self-supported hybrid ZnO nanowire/graphite membranes; Elsevier Science; Materials Letters; 269; 58; 3-2020; 1-4
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