Thermal Test of 2D Materials (Room Temperature to 77 K)
tens of nm to sub-nm thick; Room Temperature to 77 K
Product Detail
ACS Material's Raman thermal testing service measures the thermal conductivity and interface thermal resistance of 2D materials, suspended over a hole or trench, or supported on a substrate. A focused laser heats the layer, and the layer's Raman spectrum reads its temperature. The service needs two specimens, tens of nanometers to sub-nanometer thick, and runs at room temperature or from room temperature to 77 K. Typical lead time is 2–4 weeks, longer for the 77 K run.
How the measurement works
The laser beam is focused on the layer through a microscope objective. Part of its power is absorbed and heats a small spot, and the light the layer scatters, collected back through the objective, carries its Raman spectrum. The position of a Raman peak moves with temperature, so a calibrated peak shift gives the local temperature rise. Over a hole or trench, heat has to spread through the layer itself to the supported rim, and the thermal conductivity is inferred from that rise and the absorbed laser power with a heat-flow model for the specimen geometry. For a supported layer, the analysis also includes heat transfer across the layer–substrate interface, which is how the interface thermal resistance is measured. The Raman thermometry guide explains the method and what dominates its error budget.
Is this the right service?
| Your sample | Service |
|---|---|
| Free-standing wire, fiber or film, micrometer thick | Micrometer-thick service |
| Free-standing wire, fiber or film, thinner than a micrometer | Sub-micrometer service |
| A coating on its substrate, sub-micrometer to millimeter thick | Coatings service |
| A 2D layer, tens of nanometers or thinner | This service |
| A bulk piece, tens of micrometers to tens of centimeters thick | Bulk materials service |
Specimens outside these limits are worth describing before you ship them. All five services are compared on the thermal testing services page.
Check your sample
Enter your specimen and what you need. The checker compares it with the numbers listed for each service, marks what it cannot compare, and writes an inquiry you can send as it is.
Sending specimens
FAQ
Suspended or supported: which do I need?
A suspended layer, over a hole or trench and more than 6 µm across, is usually used for the in-plane thermal conductivity of the layer itself. A supported layer, more than 3 µm across, is usually used for the interface thermal resistance to its substrate. Tell us which property you need when you send the details.
Which temperature options are there?
Room temperature and room temperature to 77 K. Choose one in the Type menu at the top of this page. The 77 K run has a longer lead time.
Which 2D materials can be measured?
Layers with a Raman peak that moves measurably with temperature, such as graphene and transition-metal dichalcogenides. Send the material and the layer count with your inquiry.
How do I order?
Choose the temperature option in the Type menu at the top of this page and add the test to the cart. Then check out, or click GET A QUOTE in the cart to request a quote. For a specimen outside the listed requirements, send the details first with the sample checker.
My film is thicker than a 2D layer. Which service fits?
A free-standing film of micrometer-scale thickness fits the micrometer-thick TET service, a thinner free-standing film the sub-micrometer service, and a film that stays on its substrate the coatings service.
Related guides
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