Rights statement: This is the peer reviewed version of the following article: M. Famili, I. Grace, H. Sadeghi, C. J. Lambert, ChemPhysChem 2017, 18, 1234 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/cphc.201700147/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Accepted author manuscript, 1.4 MB, PDF document
Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Suppression of Phonon Transport in Molecular Christmas Trees
AU - Famili, Marjan
AU - Grace, Iain
AU - Sadeghi, Hatef
AU - Lambert, Colin J.
N1 - This is the peer reviewed version of the following article: M. Famili, I. Grace, H. Sadeghi, C. J. Lambert, ChemPhysChem 2017, 18, 1234 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/cphc.201700147/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
PY - 2017/5/19
Y1 - 2017/5/19
N2 - Minimising the phonon thermal conductance of self-assembled molecular films, whilst preserving their electrical properties, is highly desirable, both for thermal management at the nanoscale and for the design of high-efficiency thermoelectric materials. Here we highlight a new strategy for minimising the phonon thermal conductance of Christmas-tree-like molecules composed of a long trunk, along which phonons can propagate, attached to pendant molecular branches. We demonstrate that phonon transport along the trunk is suppressed by Fano resonances associated with internal vibrational modes of the branches and that thermal conductance is suppressed most-effectively in molecules with pendant branches of different lengths. As examples, we use density functional theory to demonstrate the reduction in phonon transport in tree-like molecules formed from alkane or acene trunks with various pendant branches.
AB - Minimising the phonon thermal conductance of self-assembled molecular films, whilst preserving their electrical properties, is highly desirable, both for thermal management at the nanoscale and for the design of high-efficiency thermoelectric materials. Here we highlight a new strategy for minimising the phonon thermal conductance of Christmas-tree-like molecules composed of a long trunk, along which phonons can propagate, attached to pendant molecular branches. We demonstrate that phonon transport along the trunk is suppressed by Fano resonances associated with internal vibrational modes of the branches and that thermal conductance is suppressed most-effectively in molecules with pendant branches of different lengths. As examples, we use density functional theory to demonstrate the reduction in phonon transport in tree-like molecules formed from alkane or acene trunks with various pendant branches.
U2 - 10.1002/cphc.201700147
DO - 10.1002/cphc.201700147
M3 - Journal article
C2 - 28240806
VL - 18
SP - 1234
EP - 1241
JO - ChemPhysChem
JF - ChemPhysChem
SN - 1439-4235
IS - 10
ER -