We provide our silicon nitride membranes coated with exceptional high-quality mono-layer graphene. Chemical Vapour Deposition is used to grow a single layer of graphene on Copper foil which then is transferred onto a wide range of substrates. Silson’s expertise and capabilities allow us to transfer a high quality film following a very strict wet transfer process developed and improved over the last years.

a) SEM image of monolayer graphene transferred onto Silicon nitride membrane,
b) TEM image showing a single 3μm coated hole,
c) hexagonal diffraction pattern

For wide ranges of nanomaterials, analysis in the TEM requires that they are deposited on a support material which has an influence in the structural and compositional information that can be obtained. Traditionally thin amorphous carbon films have been used, but graphene offers unique advantages as a TEM support material: it is extremely strong and electrically conductive (to avoid charging under the electron beam), thermally and chemically stable, offers the lowest background contrast possible and provides an inbuilt calibration for both
imaging and diffraction.

Using graphene-based supports has enabled high resolution imaging and analysis of nanoparticles, polymeric assemblies, virus and DNA samples by cryo-EM, and even the atomic resolution observation of the rotation of a single molecule.

SEM image of monolayer
graphene on 1.2μm hole array
SEM image for transferred
monolayer graphene

Graphene specifications
• Appearance (colour): Transparent
• No of graphene layers: 1 (monolayer)
• Raman D/G ratio: 0.05
• Grain size: Up to 100 μm
• Coverage in perforated membranes:
>95% for 1-1.2μm holes
>80% for 2μm holes

Raman Spectrum of our transferred monolayer graphene

Substrate options
Substrates can be chosen between perforated or standard membranes with the option of metals coating. Other product customizations are available on request.

  • Standard silicon nitride membranes as individual frames
  • Windows for TEM
  • Multi frame arrays, including TEM MFAs:
    1. MFA1: 23.5 x 23.5 mm2 with different arrays
    2. MFA2: 17.5 x 17.5 mm2 with different arrays
    3. MFA3: 14 x 14 mm2 with different arrays
  • Perforated silicon nitride membranes:
    arrays from 1 μm holes & 2μm pitch to 5 μm holes & 10 pitch
Example of substrate, TEM MFA
Example of substrate, MFA1

*Other substrates and sizes are available on request, including larger apertures.

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Latest News from Silson

A high-tech company that sells its cutting edge products across the globe has been hailed by an MP as a shining example of how regional support can help a business of any size to achieve its ambitions.

Southam-based Silson, which makes ultra-thin membranes for use in science around the world, has just celebrated its 25th anniversary with the unveiling of the latest phase of its development.

Funding for this project is the result of a successful grant application to the European Agricultural Fund for Rural Development (EAFRD) under the CWLEP Business Development priority.

This funding, managed by the Rural Payments Agency, part financed the development of the first floor of the company’s headquarters into office space and further laboratories.

Follow this link to head to the Warwickshire Means Business website to read more about Silson’s opening day on 28th June 2019.

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Latest News from Silson

Southam-based Silson is expanding after securing support from Lloyds Bank Commercial Banking and the University of Warwick Science Park.

A £373,000 funding package from Lloyds Bank has helped director Peter Anastasi to buy new premises at Insight Park and purchase a specialist electron-beam deposition tool.

This investment was also supported by a £35,000 grant from the University of Warwick Science Park’s Business Ready programme. Silson sells its ultra-thin membranes to customers in 35 countries, which include research institutes working with X-ray and electron beam technology.

The new machinery is expected to boost the company’s turnover by adding X-ray filters to its range of products.

Mr Anastasi said: “Our products are unbelievably thin membranes — around 100 nanometres thick. They are made like small windows that allow light to pass through, and that makes them ideal for the use in X-ray and e-beam research. It’s a very niche market.”

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Latest News from Silson

Latest News from Silson