Thermal Test of Free Standing Wires/Fibers and Films (Sub-Micrometer Thick)
sub-μm-thick; Room Temperature to 10K
Product Detail
ACS Material's TET testing service measures the thermal conductivity, thermal diffusivity and specific heat of sub-micrometer-thick wires, fibers and films. The specimen is measured free-standing, in vacuum, by the transient electro-thermal technique. It needs three specimens about 1 mm long and runs at room temperature or from room temperature to 10 K. Typical lead time is 1–3 weeks, longer for the 10 K run.
How the measurement works
The specimen hangs between two electrodes in vacuum, fixed at both ends with silver paste. A step current heats it, and because its electrical resistance follows its temperature, the voltage across it traces the temperature rise. The rise time gives the thermal diffusivity and the size of the steady rise gives the thermal conductivity; together they give the volumetric heat capacity, and with the density the specific heat. Heat has to flow along the specimen, so it must span the gap on its own. The TET guide covers the set-up and the signal analysis in detail. The electrothermal measurement method used here is patented: US Patent 12,372,489 B2.
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 | This service |
| A coating on its substrate, sub-micrometer to millimeter thick | Coatings service |
| A 2D layer, tens of nanometers or thinner | 2D materials 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
How is this different from the micrometer-thick service?
The micrometer-thick service is for specimens of micrometer-scale thickness. It needs three specimens about 5 mm long, offers room temperature, room temperature to 10 K and −20 °C to 70 °C, and has a typical lead time of 1–2 weeks.
Which temperature options are there?
Room temperature and room temperature to 10 K. Choose one in the Type menu at the top of this page. The 10 K run has a longer lead time.
Does my sample need to conduct electricity?
Not necessarily. TET passes a current through the specimen, so we coat a non-conductive specimen with a thin metal film first; the coating protocol guide explains how the film's share is removed. Tell us whether yours conducts electricity.
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.
Can we run TET in our own lab?
Yes, for specimens within its range. The ThermalSure® TEPT X1 implements TET as a self-contained instrument. It measures in-plane thermal diffusivity, and in-plane thermal conductivity when density and specific heat are known, on conductive and non-conductive wires 0.2–300 µm in diameter and films 0.5–300 µm thick, a few millimeters long; the TEPT X1 guide explains how a run works. This service lists three free-standing sub-micrometer specimens about 1 mm long; use the sample checker to include your actual dimensions in the inquiry.
Related guides
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