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Graphene A short summary

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Presentation on theme: "Graphene A short summary"— Presentation transcript:

1 Graphene A short summary
Patrik Thuiner

2 Goal Create a device fully transparent to electrons and fully opaque to ions e- CO2+ Ar+

3 Sample preparation / graphene transfer
1 2 3 ? Find “good” side of copper foil Etch away “bad” layer in nitric acid Spin-coat with PMMA Etch away copper foil with Fe 3 nitrate PMMA with graphene layer on bottom floating on Fe 3 nitrate First step of cleaning with demineralized water Second step of cleaning with demineralized water PMMA with graphene on bottom scooped out with mesh/GEM PMMA dissolved with acetone in Critical Point Dryer Nitric Acid 4 5 6 Iron 3 Nitrate Iron 3 Nitrate Demineralized Water 7 8 9 Acetone Demineralized Water Demineralized Water

4 Single-layer graphene on copper mesh
Coverage in the order of 70-95% e- Defects CO2+ Ar+

5 Triple-layer graphene on copper mesh
Coverage in the order of 99.9% Contaminations between layers? e- CO2+ Ar+

6 Triple-layer graphene on GEM bot electrode
field focussing kΩ to MΩ Coverage in the order of 99.9% Short between electrodes on all samples so far Probably due to graphene sample borders pre-acceleration transmission

7 New GEM layout active area YES! YES! NO!

8 Graphene samples and transfer
Previous samples New samples Supplier Graphene Supermarket Advanced Graphene Products Single-layer samples Single-layer graphene on copper (5cm x 5cm) Single-layer High Strength Metallurgical Graphene™ on PMMA (1cm x 1cm) Multi-layer samples Single-layer transferred onto another single-layer, onto another… Directly grown multi-layer Graphene transfer Cutting to smaller sample size Spin-coating with PMMA Etching of copper Transfer onto support Removal of PMMA Transfer onto support Removal of PMMA Support structure GEM-like copper mesh standard GEM, 3cm x 3cm New GEM, 0.5cm x 0.5cm area


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