Ultra-low thermal conductivity in TiO2:C superlattices

作者：Niemela Janne Petteri^*; Giri Ashutosh; Hopkins Patrick E; Karppinen Maarit

来源：Journal of Materials Chemistry A, 2015, 3(21): 11527-11532.

DOI：10.1039/c5ta01719j

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 asdeposited 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.

• 出版日期2015