In-situ measurement for 2d-material exfoliation

Reference number 9118

Sectors: Electronics


Proposed use

The proposed technology is an online monitoring system that can monitor layered 2D material production in a liquid dispersion, in real time. The system can characterize a liquid dispersion across a number of wavelengths and can also measure the number of layers of a material in dispersion.

The technology has been previously used to measure changes in graphene concentration in liquid dispersion. Graphene is one of the most unique 2D material that has numerous applications such as opto-electronics, semiconductors, biomedical sensors, energy conversation and storage. The invention can also be used to provide real-time monitoring in chemical reactions of other industrial sectors such as pharmaceutical industry.

Problem addressed

It is challenging to achieve mass production and scale-up for 2D materials, because the efficiency of production methods, especially the exfoliation method need to the improved. Exfoliation method is a core step for separating nanosheets from layered precursor to produce 2D material.

The measurement of production output and material quality of 2D materials can only be achieved through lab-scale ex-situ approaches. However, lab-scale ex-situ approaches result in an exfoliation process with many disadvantages including: invasive sampling, long time processing sample and slow turnaround time.

These disadvantages can be addressed with smart production monitoring approach but this requires complex technical considerations. This is because, material quality, reproducibility, batch traceability and integration should all be controlled during 2D material production with exfoliation method.

Technology overview

The invention indirectly measures the changes in optical characteristics of liquid dispersion by measuring the reflected light from diffuse background surface. The system involves four core steps including: measurement of static and dynamic liquid dispersions, characterisation of liquid dispersions across many discrete wavelengths, reduction of wavelength resolution and optimisation of in situ measurement of production to improve the production output of 2D materials like graphene.


  • Collecting process performance information in real time
  • Non-invasive sampling and measurement
  • Ability to detect exfoliation processing in real time
  • High temporal resolution and mixing time characterisation
  • Easy implementation in real system
  • Broad range of flow conditions
  • Low cost implementation and easy to scale-out
  • High compatibility with industrial internet platform (IoT,
    IIoT/Industry 4.0)
  • Broad range of applications in chemical processing industries such as sensing formulations, drug discovery, and pharmaceutical productions

Intellectual property information

2D-MATERIAL EXFOLIATION: PCT Application (Number: WO2021/019228)


Portrait of Professor Omar Matar
Professor Omar Matar

Head of Department of Chemical Engineering
Faculty of Engineering, Department of Chemical Engineering

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Portrait of Professor Camille Petit
Professor Camille Petit

Professor of Materials Engineering
Faculty of Engineering, Department of Chemical Engineering

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Contact us about this technology


Dr Valeska Gonzalez

Industry Partnerships and Commercialisation Executive, Engineering

Dr Valeska Gonzalez is Industry Partnerships and Commercialisation Executive for the Faculty of Engineering at Imperial College London

Contact Valeska

+44 (0)20 7594 6893

[email protected]

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