Ultra-low thermal conductivity in TiO2:C superlattices

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2015
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Language
en
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11527-11532
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JOURNAL OF MATERIALS CHEMISTRY. A, Volume 2015, issue 3
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.
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Niemelä , J-P , Giri , A , Hopkins , P E & Karppinen , M 2015 , ' Ultra-low thermal conductivity in TiO2:C superlattices ' , JOURNAL OF MATERIALS CHEMISTRY. A , vol. 2015 , no. 3 , pp. 11527-11532 . https://doi.org/10.1039/C5TA01719J