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3D and 2D growth of SnO2 nanostructures on Ga2O3 nanowires: Synthesis and structural characterization

Abstract

In this work, a simple thermal evaporation method has been used to obtain a variety of Ga2O3/SnO2 nano-assemblies with different shape and dimensionality, which may affect their physical properties, especially those influenced by surface properties. The obtained nanostructures have been characterized by electron microscopy related techniques in order to understand the growth mechanisms. By using both metallic gallium and tin oxide powders precursors, Ga2O3 nanowires (straight or branched) decorated with SnO2 nanoparticles or SnO2 quasi-two dimensional plates have been produced after dynamic thermal annealing for 2.5, 8.0 and 15.0 hours. For shorter treatments, Sn segregation at the Ga2O3 nanowires surface or defect planes have been observed by high resolution TEM, which suggests that they could act as nucleation sites for further growing of SnO2. On the other hand, longer treatments promote the formation of Ga doped SnO2 belts, from which SnO2 nanowires eventually emerge. High-resolution TEM imaging and microanalysis reveal that Ga accumulation at (200) SnO2 planes could stabilize some non-stoichiometric or intermediate tin oxide phases, such as Sn2O3, at local areas in the belts. The presence of non-stoichiometric tin oxide is relevant in applications, since surface states affect the physical-chemical behavior of tin oxide.

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Publication details

The article was received on 18 Jul 2017, accepted on 08 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE01311F
Citation: CrystEngComm, 2017, Accepted Manuscript
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    3D and 2D growth of SnO2 nanostructures on Ga2O3 nanowires: Synthesis and structural characterization

    M. Alonso-Orts, A. Sanchez, I. Lopez, E. Nogales, J. Piqueras and B. Mendez, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01311F

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