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Issue 21, 2015
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Ultra-low thermal conductivity in TiO2:C superlattices

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Abstract

TiO2:C superlattices are fabricated from atomic/molecular layer deposited (ALD/MLD) inorganic–organic [(TiO2)m(Ti–O–C6H4–O–)k=1]n thin films via a post-deposition annealing treatment that converts the as-deposited monomolecular organic layers into sub-nanometer-thick graphitic interface layers confined within the TiO2 matrix. The internal graphitic layers act as effective phonon-scattering boundaries that bring about a ten-fold reduction in the thermal conductivity of the films with a decreasing superlattice period down to an ultra-low value of 0.66 ± 0.04 W m−1 K−1 – a finding that makes inorganic-C superlattices fabricated by the present method promising structures for e.g. high-temperature thermal barriers and thermoelectric applications.

Graphical abstract: Ultra-low thermal conductivity in TiO2:C superlattices

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Article information


Submitted
06 Mar 2015
Accepted
13 Apr 2015
First published
13 Apr 2015

J. Mater. Chem. A, 2015,3, 11527-11532
Article type
Paper
Author version available

Ultra-low thermal conductivity in TiO2:C superlattices

J. Niemelä, A. Giri, P. E. Hopkins and M. Karppinen, J. Mater. Chem. A, 2015, 3, 11527
DOI: 10.1039/C5TA01719J

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