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High shear in situ exfoliation of 2D gallium oxide sheets from centrifugally derived thin films of liquid gallium

Vimalanathan K 1 , Palmer T 1 , Gardner Z 1 , Ling I 2 , Rahpeima S 1 , Elmas S 1 Show all authors , Gascooke JR 1 , Gibson CT 1 , Sun Q 3 , Zou J 3 , Andersson MR 1 , Darwish N 4 , Raston CL 1

Affiliations 

  • 1 Flinders Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University Adelaide SA 5001 Australia kasturi.vimalanathan@flinders.edu.au colin.raston@flinders.edu.au
  • 2 School of Science, Monash University Malaysia Jalan Lagoon Selatan, Bandar Sunway 47500 Selangor Malaysia
  • 3 Centre for Microscopy and Microanalysis, The University of Queensland Brisbane QLD 4072 Australia
  • 4 School of Molecular and Life Sciences, Curtin Institute for Functional Molecule and Interfaces, Curtin University Bentley Western Australia 6102 Australia
Nanoscale Adv, 2021 Oct 12;3(20):5785-5792.
PMID: 36132680 DOI: 10.1039/d1na00598g

Abstract

A diversity of two-dimensional nanomaterials has recently emerged with recent attention turning to the post-transition metal elements, in particular material derived from liquid metals and eutectic melts below 330 °C where processing is more flexible and in the temperature regime suitable for industry. This has been explored for liquid gallium using an angled vortex fluidic device (VFD) to fabricate ultrathin gallium oxide (Ga2O3) sheets under continuous flow conditions. We have established the nanosheets to form highly insulating material and have electrocatalytic activity for hydrogen evolution, with a Tafel slope of 39 mV dec-1 revealing promoting effects of the surface oxidation (passivation layer).

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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