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Zn_2GeO_4/SnO_2 nanowire heterostructures driven by plateau-rayleigh instability

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Dolado Fernández, Jaime and Renforth, Kate L. and Nunn, James E and Hindsmarsh, Steve A. and Hidalgo Alcalde, Pedro and Sánchez, Ana M. and Méndez Martín, Bianchi (2020) Zn_2GeO_4/SnO_2 nanowire heterostructures driven by plateau-rayleigh instability. Crystal growth & design, 20 (1). pp. 506-513. ISSN 1528-7483

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Official URL: http://dx.doi.org/10.1021/acs.cgd.9b01494


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Abstract

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.


Item Type:Article
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©2020 American Chemical Society
This work was supported by the Spanish Ministry of Innovation, Science and Technology through Research Projects MAT-2015-65274-R/FEDER, RTI2018-097195-B-100 and M-ERA.NET PCIN-2017-106.

Uncontrolled Keywords:Shell nanowires; Crystal-growth; Quantum dots; Luminescence; Emission; Defects; Oxide
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:59219
Deposited On:20 Feb 2020 13:16
Last Modified:21 Apr 2020 18:37

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