Measuring Thermal and Thermoelectric Properties of One-Dimensional Nanostructures Using a Microfabricated Device

TLDR

A microfabricated device with two silicon nitride membranes, each equipped with a platinum heater/thermometer, measures thermal conductance, electrical conductance, and Seebeck coefficient of one‑dimensional nanostructures by Joule heating one membrane and monitoring heat flow to the other over 4–400 K. The study reports measurement sensitivity, error sources, and uncertainties, and presents thermal and electrical data for 148 nm and 10 nm single‑wall carbon nanotube bundles.

Abstract

We have batch-fabricated a microdevice consisting of two adjacent symmetric silicon nitride membranes suspended by long silicon nitride beams for measuring thermophysical properties of one-dimensional nanostructures (nanotubes, nanowires, and nanobelts) bridging the two membranes. A platinum resistance heater/thermometer is fabricated on each membrane. One membrane can be Joule heated to cause heat conduction through the sample to the other membrane. Thermal conductance, electrical conductance, and Seebeck coefficient can be measured using this microdevice in the temperature range of 4–400 K of an evacuated Helium cryostat. Measurement sensitivity, errors, and uncertainty are discussed. Measurement results of a 148 nm and a 10 nm-diameter single wall carbon nanotube bundle are presented.