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Probing nanoscale solids at thermal extremes.

G E Begtrup¹, K G Ray, B M Kessler

¹Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.

Physical Review Letters

|November 13, 2007

Summary

Carbon nanotubes exhibit remarkable stability up to 3200 K, surpassing graphite and diamond. This nanoscale thermal platform enables real-time electron microscopy of materials at extreme temperatures.

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Area of Science:

Materials Science
Nanotechnology
Physics

Background:

Understanding material behavior at extreme temperatures is crucial for advanced applications.
Transmission electron microscopy (TEM) is a powerful tool for nanoscale characterization.
Existing platforms often lack the capability for simultaneous extreme temperature operation and high-resolution imaging.

Purpose of the Study:

To develop and demonstrate a novel nanoscale thermal platform for extreme temperature operation.
To investigate the thermal stability and properties of multiwall carbon nanotubes (CNTs) at high temperatures.
To explore the melting behavior of gold nanocrystals using this platform.

Main Methods:

Development of a nanoscale thermal platform compatible with real-time high-resolution transmission electron microscopy.

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In-situ heating experiments on multiwall carbon nanotubes (CNTs) up to 3200 K.

In-situ heating experiments on gold (Au) nanocrystals to determine melting point dependence on diameter.

Main Results:

Multiwall carbon nanotubes (CNTs) demonstrate atomic-scale stability up to 3200 K, exceeding the robustness of graphite and diamond.
CNTs retain 10% of their peak thermal conductivity and support high current densities (~2 x 10^8 A/cm^2) at extreme temperatures.
The platform enabled determination of the diameter-dependent melting temperature of gold nanocrystals down to 3 nm.

Conclusions:

Carbon nanotubes possess exceptional thermal stability and mechanical robustness at extreme temperatures.
The developed nanoscale thermal platform is effective for studying material properties under extreme conditions.
This research provides critical data for the design and application of nanomaterials in high-temperature environments.