Journal
NANO LETTERS
Volume 15, Issue 5, Pages 2985-2991Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl504844d
Keywords
Nanoscale; molecular junctions; thermal transport; self-assembly; thermoreflectance; molecular dynamics
Categories
Funding
- National Science Foundation (NSF) CAREER Award [ENG-1149374]
- NSF [CCF-0811770]
- American Chemical Society (ACS) PRF DNI [PRF51423DN10]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1149374] Funding Source: National Science Foundation
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We present measurements of the thermal conductance of self-assembled monolayer (SAM) junctions formed between metal leads (Au, Ag, Pt, and Pd) with mismatched phonon spectra. The thermal conductance obtained from frequency domain thermoreflectance experiments is 65 +/- 7 MW/m(2) K for matched Au-alkanedithiolAu junctions, while the mismatched Au-alkanedithiolPd junctions yield a thermal conductance of 36 +/- 3 MW/m(2) K. The experimental observation that junction thermal conductance (per molecule) decreases as the mismatch between the lead vibrational spectra increases, paired with results from molecular dynamics (MD) simulations, suggest that phonons scatter elastically at the metalSAM interfaces. Furthermore, we resolve a known discrepancy between measurements and MD predictions of SAM thermal conductance by using a contact mechanics model to predict 54 +/- 15% areal contact in the Au-alkanedithiolAu experimental junction. This incomplete contact obscures the actual junction thermal conductance of 115 +/- 22 MW/m(2) K, which is comparable to that of metaldielectric interfaces.
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