Preparation of Gallium Sulfide Nanosheets by Liquid Exfoliation and Their Application As Hydrogen Evolution Catalysts

By Andrew Harvey, C. Backes, Z. Gholamvand, D. Hanlon, D. McAteer, H. Nerl, E. McGuire, A. Seral-Ascaso, Q. Ramasse, Niall McEvoy and 7 more. 2015

218 citations recorded by the source corpus.

Here, we demonstrate the production of large quantities of gallium sulfide (GaS) nanosheets by liquid exfoliation of layered GaS powder. The exfoliation was achieved by sonication of the powder in suitable solvents. The variation of dispersed concentration with solvent was consistent with classical solution thermodynamics and showed successful solvents to be those with Hildebrand solubility parameters close to 21.5 MPa1/2. In this way, nanosheets could be produced at concentrations of up to ∼0.2 mg/mL with lateral sizes and thicknesses of 50–1000 nm and 3–80 layers, respectively. The nanosheets appeared to be relatively defect-free although oxygen was observed in the vicinity of the edges. Using controlled centrifugation techniques, it was possible to prepare dispersions containing size-selected nanosheets. Spectroscopic measurements showed the optical properties of the dispersions to vary strongly with nanosheet size, allowing the elucidation of spectroscopic metrics for in situ estimation of nanosheet s...

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/d1c17c89632be768786b0872220517dab8990a1c

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

In Materials Chemistry

Citations in the corpus

Guidelines for Exfoliation, Characterization and Processing of Layered Materials Produced by Liquid Exfoliation (2017, background): “9 approach.(27) Therefore, in general, when attempting to exfoliate a new material it is important to not only consider the stabilizer, but also to test various available exfoliation methods.”
From two-dimensional materials to their heterostructures: An electrochemist's perspective (2017, methodology): “GaS nanosheets were also prepared by LPE and HER activity (b ∼ 85–106 mV dec−1) dependent on their lateral size was observed [96].”
Production and processing of graphene and related materials (2020, methodology): “It was applied to WS2 and MoS2 [186, 245, 452, 453] as Ni(OH)2 [240], GaS [188], BP [190] and FLG [176, 236] in solvents [176, 188, 190] as well as aqueous surfactant [177, 186, 236, 240, 452] or polymer systems [453].”