Ultra-low thermal conductivity in TiO2:C superlattices

Janne-Petteri Niemelä; A. Giri; P.E. Hopkins; Maarit Karppinen

doi:10.1039/C5TA01719J

Ultra-low thermal conductivity in TiO2:C superlattices

Janne-Petteri Niemelä, A. Giri, P.E. Hopkins, Maarit Karppinen

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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.

Original language	English
Pages (from-to)	11527-11532
Journal	JOURNAL OF MATERIALS CHEMISTRY. A
Volume	2015
Issue number	3
DOIs	https://doi.org/10.1039/C5TA01719J
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

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10.1039/C5TA01719J

ERC-5-acceptedAccepted author manuscript, 490 KB

Molecular-Layer-Engineered Inorganic-Organic Hybrid Materials
Mustonen, O. (Project Member), Multia, J. (Project Member), Tripathi, T. (Project Member), Jin, H. (Project Member), Khayyami, A. (Project Member), Thomas, C. (Project Member), Ahvenniemi, E. (Project Member), Heiska, J. (Project Member), Hagen, D. (Project Member), Karppinen, M. (Principal investigator), Aleksandrova, I. (Project Member), Haggren, A. (Project Member), Nisula, M. (Project Member), Johansson, L.-S. (Project Member), Tiittanen, T. (Project Member), Giedraityte, Z. (Project Member), Krahl, F. (Project Member), Marin, G. (Project Member), Chou, T.-L. (Project Member), Niemelä, J.-P. (Project Member), Ghazy, A. (Project Member), Srivastava, D. (Project Member), Philip, A. (Project Member), Lepikko, S. (Project Member), Safdar, M. (Project Member) & Medina, E. (Project Member)
23/12/2013 → 31/01/2019
Project: EU: ERC grants

Cite this

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title = "Ultra-low thermal conductivity in TiO2:C superlattices",

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.",

author = "Janne-Petteri Niemel{\"a} and A. Giri and P.E. Hopkins and Maarit Karppinen",

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year = "2015",

doi = "10.1039/C5TA01719J",

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T1 - Ultra-low thermal conductivity in TiO2:C superlattices

AU - Niemelä, Janne-Petteri

AU - Giri, A.

AU - Hopkins, P.E.

AU - Karppinen, Maarit

N1 - | openaire: EC/FP7/339478/EU//LAYERENG-HYBMAT

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

U2 - 10.1039/C5TA01719J

DO - 10.1039/C5TA01719J

M3 - Article

SN - 2050-7488

VL - 2015

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JO - JOURNAL OF MATERIALS CHEMISTRY. A

JF - JOURNAL OF MATERIALS CHEMISTRY. A

IS - 3

ER -

Ultra-low thermal conductivity in TiO2:C superlattices

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Molecular-Layer-Engineered Inorganic-Organic Hybrid Materials

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