Mesoscopic thermal transport and energy dissipation in carbon nanotubes
نویسندگان
چکیده
We have measured the thermal conductivity of an individual multiwalled carbon nanotube (MWNT) using a microfabricated suspended device. The observed thermal conductivity is more than 3000W/K-m at room temperature, which is two orders of magnitude higher than the estimation from previous experiments that used macroscopic mat samples. In addition, the temperature distributions in electrically heated MWNTs have been measured with a scanning thermal microscope. The temperature profiles along the tube axis in MWNTs indicate the bulk dissipation of electronic energy to phonons, which suggests diffusive electronic transport. r 2002 Elsevier Science B.V. All rights reserved.
منابع مشابه
Mesoscopic thermal and thermoelectric measurements of individual carbon nanotubes
We discuss the mesoscopic experimental measurements of electron energy dissipation, phonon thermal transport, and thermoelectric phenomena in individual carbon nanotubes. The temperature distributions in electrically heated individual multiwalled carbon nanotubes have been measured with a scanning thermal microscope. The temperature profiles along the tube axis in nanotubes indicate the bulk di...
متن کاملQuasi-ballistic thermal transport from nanoscale interfaces observed using ultrafast coherent soft X-ray beams.
Fourier theory of thermal transport considers heat transport as a diffusive process where energy flow is driven by a temperature gradient. However, this is not valid at length scales smaller than the mean free path for the energy carriers in a material, which can be hundreds of nanometres in crystalline materials at room temperature. In this case, heat flow will become 'ballistic'--driven by di...
متن کاملRole of Interatomic Potentials in Simulation of Thermal Transport in Carbon Nanotubes
Interatomic potentials, which describe interactions between elements of nanosystems, are crucial in theoretical study of their physical properties. We focus on two well known empirical potentials, i.e. Tersoff's and Brenner's potentials, and compare their performance in calculation of thermal transport in carbon nanotubes. In this way, we study the temperature and diameter dependence of thermal...
متن کاملSingle Walled Carbon Nanotube Effects on Mixed Convection heat Transfer in an Enclosure: a LBM Approach
The effects of Single Walled Carbon Nanotube (SWCNT) on mixed convection in a cavity are investigated numerically. The problem is studied for different Richardson numbers (0.1-10), volume fractions of nanotubes (0-1%), and aspect ratio of the cavity (0.5-2.5) when the Grashof number is equal to 103. The volume fraction of added nanotubes to Water as base fluid are lowers than 1% to make dilute ...
متن کاملImaging dissipation and hot spots in carbon nanotube network transistors
We use infrared thermometry of carbon nanotube network CNN transistors and find the formation of distinct hot spots during operation. However, the average CNN temperature at breakdown is significantly lower than expected from the breakdown of individual nanotubes, suggesting extremely high regions of power dissipation at the CNN junctions. Statistical analysis and comparison with a thermal mode...
متن کامل