Title: A versatile approach to synthesise optically active hierarchical ZnS/ZnO heterostructures

Authors: Do Quang Trung; Nguyen Tu; Pham Toan Thang; Pham Thanh Huy

Addresses: Nano Optoelectronics Laboratory (LaNopel), Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), F building, 40 Ta Quang Buu street, Hanoi, Vietnam ' Nano Optoelectronics Laboratory (LaNopel), Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), F building, 40 Ta Quang Buu street, Hanoi, Vietnam ' Nano Optoelectronics Laboratory (LaNopel), Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), F building, 40 Ta Quang Buu street, Hanoi, Vietnam ' Nano Optoelectronics Laboratory (LaNopel), Advanced Institute for Science and Technology (AIST), Hanoi University of Science and Technology (HUST), F building, 40 Ta Quang Buu street, Hanoi, Vietnam

Abstract: One-dimensional hierarchical ZnS/ZnO heterostructures have been successfully fabricated by combining thermal evaporation method and in-situ/post oxidation process. Various morphologies of the secondary ZnO nanostructures such as nanosheets, nanoparticles, and nanoteeths were found to form on the ZnS nanowire backbone. The optical properties of the heterostructures were investigated by high-spatial resolution cathodoluminescence spectroscopy. It was demonstrated that optically active hierarchical ZnS/ZnO heterostructures, which strongly emit UV light with two emission bands at around 335 nm and 380 nm characterising both the ZnS and the ZnO phases, can be realised by controlling the oxidation temperature and duration. This research introduces a simple route to synthesise optically active ZnS/ZnO heterostructures.

Keywords: ZnS/ZnO heterostructures; one dimensional nanostructures; optical properties; thermal evaporation method; in-situ oxidation; post oxidation; ZnS-ZnS phase transition.

DOI: 10.1504/IJNT.2018.089570

International Journal of Nanotechnology, 2018 Vol.15 No.1/2/3, pp.222 - 232

Published online: 30 Jan 2018 *

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