Transforming layered MoS2 into functional MoO2 nanowires

Journal article


Publication Details

Author(s): Vogl L, Schweizer P, Wu M, Spiecker E
Journal: Nanoscale
Publication year: 2019
Volume: 11
Journal issue: 24
Pages range: 11687-11695
ISSN: 2040-3364
eISSN: 2040-3372


Abstract

A new in situ synthesis method for the growth of MoO2 nanowires via controlled thermal oxidation of MoS2 flakes is presented, going from a 2D transition metal chalcogenide to a transition metal oxide nanostructure. The wire growth is performed under an optical microscope using a heating stage with adjustable atmospheric conditions. In contrast to prevalent syntheses, this templated growth leads to highly directional wires along defined MoS2 crystallographic directions. We examine the growth kinetics of the wires in dependence of the process temperature. In the temperature regime from 650 °C to 710 °C high quality MoO2 nanowires are formed in a reaction-limited growth process with an activation energy of 596 kJ mol-1. The functional properties of the nanowires are studied by a combination of in situ electron microscopy techniques. Four point measurements in an SEM reveal outstanding metal-like behavior of the nanowires with resistivity values as low as 3.5 × 10-6 Ω m. Surprisingly, junctions between intergrown nanowires show hardly any increase in resistivity which can be attributed to the well-defined orientational relationship of the nanowires resulting from their templated growth on MoS2. Elastic properties of the nanowires are studied by complementary in situ bending and resonance measurements in SEM yielding consistent values of 383 GPa for the Young's modulus. Finally, field emission of single MoO2 nanowires is studied in situ inside the TEM, and an emission current of 500 nA is achieved. The combination of simple synthesis route with outstanding functional properties make the MoO2 nanowires promising candidates for functional devices in the field of novel 1D-oxide/2D-chalcogenide hybrids. The presented synthesis can be generalized and applied to other metal chalcogenides such as WS2, as well.


FAU Authors / FAU Editors

Schweizer, Peter
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Vogl, Lilian
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Wu, Mingjian Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Additional Organisation
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden


How to cite

APA:
Vogl, L., Schweizer, P., Wu, M., & Spiecker, E. (2019). Transforming layered MoS2 into functional MoO2 nanowires. Nanoscale, 11(24), 11687-11695. https://dx.doi.org/10.1039/c9nr03346g

MLA:
Vogl, Lilian, et al. "Transforming layered MoS2 into functional MoO2 nanowires." Nanoscale 11.24 (2019): 11687-11695.

BibTeX: 

Last updated on 2019-16-07 at 15:15