Tiny tool measures heat at the nanoscale
Cornell researchers , led by Prof. Richard Robinson, have developed a new way to precisely measure the extremely subtle movement of heat in nanostructures. The scientists developed a new instrument using special tools at the Cornell NanoScale Science and Technology Facility (CNF), and used it to directly measure the surface scattering of phonons in silicon nanosheets. They made nanosheets only 100 nanometers wide, which is 1,000 times thinner than a human hair. The advanced fabrication resources of the Cornell NanoScale Science and Technology Facility (CNF)were a key component in the success of their project.
Recently published online in Nano Letters and highlighted in Physics Today, the study features the researchers’ phonon spectrometer, whose measurements are 10 times sharper than standard methods. This boosted sensitivity has uncovered never-before-seen effects of phonon transport.
The paper, “Direct Measurements of Surface Scattering in Si Nanosheets using a Microscale Phonon Spectrometer: Implications for Casimir-Limit Predicted by Ziman Theory,” also co-authored by graduate students Mahmut Aksit and Obafemi Otelaja and Derek Stewart, a CNF senior research associate, was supported by the National Science Foundation and the Department of Energy, Office of Basic Energy Science. Dr, Derek Stewart is one of the NNIN Compuational Nanoscience Technical Liaisons, supporting user needs in computational nanoscience.
Source: Cornell Chronicle.