New way to check the quality of nanomaterials like graphene

Date:
August 12, 2020
Source:
University of Sussex
Summary:
A new way to check the quality of nanomaterials like graphene
has emerged.



FULL STORY ==========================================================================
A new way to check the quality of nanomaterials like graphene has emerged
from a team at the University of Sussex.


========================================================================== Graphene and nanomaterials have been touted as wonder materials, and
they are proving invaluable in all sorts of applications, such as in
the automotive and aerospace industries, where heavy metals are replaced
with lighter but equally strong composite materials. Nanomaterial quality therefore matters a great deal, but standardisation and quality checking
have eluded the industry.

The Sussex team have developed a technique that gives detailed
information about the size and thickness of graphene particles. It uses
a non-destructive, laser-based method for looking at the particles as a
whole, and lets them quickly build a detailed picture of the distribution
of particles in a given material. Their paper "Raman Metrics for
Molybdenum Disulfide and Graphene Enable Statistical Mapping of Nanosheet Populations" is published in the journal 'Chemistry of Materials'.

Dr Matt Large, who led the discovery in the School of Mathematical and
Physical Sciences at the University of Sussex, said: "Standards for
measurement are a really critical underpinning of modern economies. It
really comes down to one simple question; how do you know you got what
you paid for? "At the moment the graphene industry is a bit of a wild frontier; it's very difficult to compare different products because
there is no agreed way of measuring them. That's where studies like ours
come in.



========================================================================== "It's really an important issue for any business looking to reap the
benefits of graphene (or any other nanomaterial, for that matter) in
their products.

Often using the wrong material can either have no benefit at all, or
even make product performance worse.

"A particular example would be composite materials like
graphene-reinforced plastics; if a poor-quality graphene material is used
it can cause parts to fail instead of providing the improved strength
expected. This can be a big issue for industries such as automotive and aerospace, where there is enormous effort behind replacing heavier metal
parts with lighter composite materials (like carbon fibre) that are just
as strong. If graphene and other nanomaterials are to play a role in
reducing weight and cost then agreed standards are really important."
Aline Amorim Graf is a co-author of the paper in the team at the School
of Mathematical and Physical Sciences at the University of Sussex. She
said: "Some manufacturers say they produce graphene but actually --
no doubt inadvertently -- produce a form of graphite. Some will charge
up to -L-500 per gram.

"The trouble is there's no standardisation. What we've done is to create a
new way to measure the quality of nanomaterials like graphene. We use a
Raman spectrometer to do this, and have created an algorithm to automate
the process.

In this way, we can determine the quality, size and thickness of the
sample.



========================================================================== "Clearly the quality of graphene really matters. If you're using
graphene to strengthen structures, to use in health monitors, to use in supermarket tags, you want to know you're getting the real stuff. But
actually purchasers of graphene have no clue as to the quality of what
they're buying online. If you're using graphene to strengthen cement,
and it turns out it's actually not graphene or is low quality graphene,
then that's going to matter." Professor Alan Dalton, co-Director of the
Sussex Programme for Quantum Research and co-author of the paper, said:
"This is truly an important area of research for our team. We believe
that our new metric will be of great help to industry, researchers
and standards bodies alike who are key-stakeholders in the development
of 2D materials towards commercialisation." The Graphene Council has
long called for better standardisation. Terrance Barkan of the Graphene
Council has said has written: "The lack of an agreed global standard for graphene and closely related materials creates a vacuum and lack of trust
in the marketplace for industrial scale adoption of graphene materials."
The Sussex team continue their research and are open to checking the
quality of graphene on a consultative basis.


========================================================================== Story Source: Materials provided by University_of_Sussex. Original
written by Anna Ford.

Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Aline Amorim Graf, Sean P. Ogilvie, Hannah J. Wood, Christopher
J. Brown,
Manoj Tripathi, Alice A. K. King, Alan B. Dalton, Matthew
J. Large. Raman Metrics for Molybdenum Disulfide and Graphene
Enable Statistical Mapping of Nanosheet Populations. Chemistry of
Materials, 2020; 32 (14): 6213 DOI: 10.1021/acs.chemmater.0c02109 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200812144100.htm

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