"Interfaces between different materials are often heat-flow bottlenecks due to stifled phonon transport. Inserting a third material usually only makes things worse because of an additional interface created," Ramanath said. "However, our method of introducing an ultrathin nanolayer of organic molecules that strongly bond with both the materials at the interface gives rise to multi-fold increases in interfacial thermal conductance, contrary to poor heat conduction seen at inorganic-organic interfaces. This method to tune thermal conductance by controlling adhesion using an organic nanolayer works for multiple materials systems, and offers a new means for atomic- and molecular-level manipulation of multiple properties at different types of materials interfaces. Also, it's cool to be able to do this rather unobtrusively by the simple method of self-assembly of a single layer of molecules."
Results of the new study, titled "Bonding-induced thermal conductance enhancement at inorganic heterointerfaces using nanomolecular monolayers," were published online recently by Nature Materials, and will appear in an upcoming print edition of the journal. The study may be viewed online at: http://go.nature.com/3LLeYP
The research team used a combination of experiments and theory to validate their findings.
"Our study establishes the correlation between interfacial bond strength and thermal conductance, which serves to underpin new theoretical descriptions and open up new ways to control interfacial heat transfer," said co-author Pawel Keblinski, professor in the Department of Materials Science and Engineering at Rensselaer.
"It is truly remarkable that a single molecular layer can bring about such a large improvement in the thermal properties of interfaces by forming strong interfacial bonds. This would be useful for controlling heat transport for many applications in electron
|Contact: Michael Mullaney|
Rensselaer Polytechnic Institute