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oai:docta.ucm.es:20.500.14352/60712024-08-29T16:35:19Zcom_20.500.14352_14col_20.500.14352_15

Dolado Fernández, Jaime Renforth, Kate L. Nunn, James E Hindsmarsh, Steve A. Hidalgo Alcalde, Pedro Sánchez, Ana M. Méndez Martín, María Bianchi 2023-06-16T15:16:06Z 2023-06-16T15:16:06Z 2020-01 1528-7483 10.1021/acs.cgd.9b01494 https://hdl.handle.net/20.500.14352/6071 http://dx.doi.org/10.1021/acs.cgd.9b01494 https://pubs.acs.org/ Herein, we report the formation of a particular core-shell structure, with a zinc germanate (Zn_2GeO_4) nanowire core and a discontinuous shell of SnO_2 nanocrystals, obtained in a single-step process. We propose a growth model that combines the Plateau-Rayleigh mechanism to produce a pattern of amorphous germanium oxide (a-GeO_2) particles along the Zn_2GeO_4 nanowire and the subsequent growth of well-faceted SnO_2 crystals when the nanowire orientation meets good lattice matching conditions. In this latter case, the linear array of a-GeO_2 particles acts as nucleation sites for the SnO_2 crystallites, leading to a skewer-like morphology that retains the periodicity of the Plateau-Rayleigh process. Otherwise, nanowires with different orientations appear decorated with a pattern of a-GeO_2 beads mimicking a necklace. Atomic resolution electron microscopy has been used to characterize the Zn_2GeO_4/SnO_2 nanoheterostructures. In addition, optical confinement effects have been observed in the luminescence maps and spectra, which have potential for further exploitation in the design of optical microcavities. eng open access Zn_2GeO_4/SnO_2 nanowire heterostructures driven by plateau-rayleigh instability journal article