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GaN/Ga2O3 Core/Shell Nanowires Growth: Towards High Response Gas Sensors

Centre de Nanosciences et de Nanotechnologies—CNRS-UMR9001, Université Paris-Sud, Université Paris-Saclay, 10 Boulevard Thomas Gobert, F-91120 Palaiseau, France
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Appl. Sci. 2019, 9(17), 3528; https://doi.org/10.3390/app9173528
Received: 30 June 2019 / Revised: 19 August 2019 / Accepted: 21 August 2019 / Published: 28 August 2019
(This article belongs to the Section Nanotechnology and Applied Nanosciences)
The development of sensors working in a large range of temperature is of crucial importance in areas such as monitoring of industrial processes or personal tracking using smart objects. Devices integrating GaN/Ga2O3 core/shell nanowires (NWs) are a promising solution for monitoring carbon monoxide (CO). Because the performances of sensors primarily depend on the material properties composing the active layer of the device, it is essential to control them and achieve material synthesis in the first time. In this work, we investigate the synthesis of GaN/Ga2O3 core-shell NWs with a special focus on the formation of the shell. The GaN NWs grown by plasma-assisted molecular beam epitaxy, are post-treated following thermal oxidation to form a Ga2O3-shell surrounding the GaN-core. We establish that the shell thickness can be modulated from 1 to 14 nm by changing the oxidation conditions and follows classical oxidation process: A first rapid oxide-shell growth, followed by a reduced but continuous oxide growth. We also discuss the impact of the atmosphere on the oxidation growth rate. By combining XRD-STEM and EDX analyses, we demonstrate that the oxide-shell is crystalline, presents the β-Ga2O3 phase, and is synthesized in an epitaxial relationship with the GaN-core. View Full-Text
Keywords: core/shell nanowires; GaN; Ga2O3; metal-oxide semiconductor; gas sensor devices core/shell nanowires; GaN; Ga2O3; metal-oxide semiconductor; gas sensor devices
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MDPI and ACS Style

Bui, Q.C.; Largeau, L.; Morassi, M.; Jegenyes, N.; Mauguin, O.; Travers, L.; Lafosse, X.; Dupuis, C.; Harmand, J.-C.; Tchernycheva, M.; Gogneau, N. GaN/Ga2O3 Core/Shell Nanowires Growth: Towards High Response Gas Sensors. Appl. Sci. 2019, 9, 3528.

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