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Tuning the conduction mechanism in niobium-doped titania nanoparticle networks
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SYSNO ASEP 0361372 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Tuning the conduction mechanism in niobium-doped titania nanoparticle networks Author(s) Němec, Hynek (FZU-D) RID, ORCID, SAI
Mics, Zoltan (FZU-D)
Kempa, Martin (FZU-D) RID, ORCID
Kužel, Petr (FZU-D) RID, ORCID, SAI
Hayden, O. (DE)
Liu, Y. (DE)
Bein, T. (DE)
Fattakhova-Rohlfing, D. (DE)Source Title Journal of Physical Chemistry C. - : American Chemical Society - ISSN 1932-7447
Roč. 115, č. 14 (2011), s. 6968-6974Number of pages 7 s. Language eng - English Country US - United States Keywords time-domain terahertz spectroscopy ; electron transport ; transparent conductors ; doped TiO2 Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GP202/09/P099 GA ČR - Czech Science Foundation (CSF) IAA100100902 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000289215400103 DOI 10.1021/jp200822y Annotation Networks of niobium-doped TiO2 anatase nanoparticles with variable doping concentrations were investigated by time-domain terahertz spectroscopy and microwave impedance spectroscopy. A detailed description of their electromagnetic response is proposed; the model takes into account the depolarization fields of inhomogeneous samples and allows us to understand the conductive and dielectric response of individual nanoparticles. We find that electron hopping is the dominating contribution to the conductivity at terahertz frequencies and that the dielectric losses of TiO2 nanoparticles are enhanced in comparison with bulk anatase. The conductive properties of nanoparticles can be tuned via synthesis conditions and thermal posttreatment. In particular, annealing at elevated temperatures improves the nanoparticle crystallinity, reduces the density of structural defects, and enhances the conductive percolation of the network. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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