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Tuning the conduction mechanism in niobium-doped titania nanoparticle networks
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SYSNO ASEP 0361372 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Tuning the conduction mechanism in niobium-doped titania nanoparticle networks Tvůrce(i) 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)Zdroj.dok. Journal of Physical Chemistry C. - : American Chemical Society - ISSN 1932-7447
Roč. 115, č. 14 (2011), s. 6968-6974Poč.str. 7 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova time-domain terahertz spectroscopy ; electron transport ; transparent conductors ; doped TiO2 Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GP202/09/P099 GA ČR - Grantová agentura ČR IAA100100902 GA AV ČR - Akademie věd CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000289215400103 DOI 10.1021/jp200822y Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2012
Počet záznamů: 1