Graphene visibility vs. SiO2 thickness

In summary, the conversation discusses the visibility of single-layer flakes of graphene on substrates with non-optimum thickness of SiO2. The person is wondering if the flakes will still be visible on substrates with 320 nm of SiO2, and references a paper that suggests a change in contrast and wavelength. Another person responds that it won't matter much, as graphene is still visible on surfaces with 250-300 nm of SiO2.
  • #1

has anyone had any experience with visibility of single-layer flakes of graphene on substrates with non-optimum thickness of SiO2?
We've been shopping for some Silicon wafers with 300 nm of SiO2, but our supplier can only ensure the oxide thickness within 10% of the specified value. I was wondering if the substrates with, say, 320 nm of SiO2 would still allow the flakes to be visible with an optical microscope.

The only paper I found specifically addressing this problem ("Making graphene visible", ) has a calculated visibility plot which would suggest that at oxide thickness of 320 nm the contrast would reduce and shift to a different wavelength (compared to the thickness of 300 nm) and I was wondering how much of an issue this would be in practice.
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  • #2
It won’t matter so much. Graphene is pretty easy to see on 250-300nm surfaces (it’s even easier to see on 100 non surfaces).

Related to Graphene visibility vs. SiO2 thickness

1. What is Graphene visibility?

Graphene visibility refers to the ability to observe or see graphene layers on a substrate, such as SiO2. This is an important factor in studying and utilizing graphene for various applications.

2. How does the thickness of SiO2 affect Graphene visibility?

The thickness of SiO2 has a significant impact on the visibility of graphene. Thinner layers of SiO2 allow for better visibility of graphene layers, while thicker layers can obscure or hide the graphene.

3. Why is Graphene visibility vs. SiO2 thickness important?

Understanding the relationship between Graphene visibility and SiO2 thickness is crucial for researchers and scientists working with graphene. It can help determine the optimal thickness of SiO2 for specific applications and improve the accuracy of measurements.

4. How is Graphene visibility vs. SiO2 thickness measured?

Graphene visibility vs. SiO2 thickness is typically measured using atomic force microscopy (AFM) or scanning electron microscopy (SEM). These techniques allow for the visualization and measurement of graphene layers on different thicknesses of SiO2.

5. What are the potential applications of studying Graphene visibility vs. SiO2 thickness?

Studying Graphene visibility vs. SiO2 thickness can have various applications, such as optimizing the fabrication process of graphene devices, improving the accuracy of graphene-based sensors, and developing new techniques for studying and manipulating graphene layers.

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