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Surface cleaning of 2D materials : Boron Nitride Nanosheets (BNNS) and exfoliated Graphite Nanoplatelets (GNP)

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Guerra, Valentina and McNally, Tony (2020) Surface cleaning of 2D materials : Boron Nitride Nanosheets (BNNS) and exfoliated Graphite Nanoplatelets (GNP). Advanced Materials Interfaces . 2000944. doi:10.1002/admi.202000944 (In Press)

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Official URL: https://doi.org/10.1002/admi.202000944

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Abstract

Surface impurities such as water and surfactants can significantly affect the properties of 2D materials. They disrupt the 2D material lattice structure and surface chemistry and also promote electron and phonon scattering. Strategies to clean the surfaces of 2D materials are therefore critical to achieving optimal properties. Boron nitride nanosheets (BNNS) and exfoliated graphite nanoplatelets (GNP) are treated using three procedures: washing with ethanol, water‐assisted freeze‐drying, and freeze‐drying without addition of water in an attempt to remove two impurities—water and an ionic surfactant (sodium cholate, SC). There is total removal of water from BNNS when the starting material is treated using either freeze drying method whereas some water (≈40%) and traces of ethanol are detected in BNNS when washed with ethanol. It is not possible to exclude the presence of SC on BNNS and GNP post treatment; however, the relatively high amount of sodium (from SC) in the samples after freeze‐drying suggests the process contributed to the separation of BNNS and GNP aggregates. The BNNS flakes separate when washed with ethanol or freeze‐dried in the absence of water. The crystalline structure of BNNS and GNP is retained post treatments. This approach provides a route to cleaning and separating 2D materials.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Nanostructured materials, Graphene, Boron nitride, Nanotubes, Surface contamination , Surfaces (Technology)
Journal or Publication Title: Advanced Materials Interfaces
Publisher: Wiley
ISSN: 2196-7350
Official Date: 18 August 2020
Dates:
DateEvent
18 August 2020Available
Date of first compliant deposit: 19 August 2020
Article Number: 2000944
DOI: 10.1002/admi.202000944
Status: Peer Reviewed
Publication Status: In Press
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/L016389/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EngD StudentshipThomas Swan & Co Ltd.https://www.thomas-swan.co.uk/
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