Počet záznamů: 1

Photoconductive, dielectric and percolation properties of anodic TiO.sub.2./sub. nanotubes studied by terahertz spectroscopy

SYSNO ASEP	0489478
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Photoconductive, dielectric and percolation properties of anodic TiO₂ nanotubes studied by terahertz spectroscopy
Tvůrce(i)	Kuchařík, Jiří (FZU-D)_ORCID Sopha, H. (CZ) Krbal, M. (CZ) Rychetský, Ivan (FZU-D)_{RID, ORCID} Kužel, Petr (FZU-D)_{RID, ORCID, SAI} Macák, J. M. (CZ) Němec, Hynek (FZU-D)_{RID, ORCID, SAI}
Celkový počet autorů	7
Číslo článku	014004
Zdroj.dok.	Journal of Physics D-Applied Physics. - : Institute of Physics Publishing - ISSN 0022-3727 Roč. 51, č. 1 (2018), s. 1-9
Poč.str.	9 s.
Jazyk dok.	eng - angličtina
Země vyd.	GB - Velká Británie
Klíč. slova	anodic TiO₂ nanotubes ; terahertz spectroscopy ; charge transport ; dielectric properties
Vědní obor RIV	BM - Fyzika pevných látek a magnetismus
Obor OECD	Condensed matter physics (including formerly solid state physics, supercond.)
CEP	GA17-03662S GA ČR - Grantová agentura ČR
Institucionální podpora	FZU-D - RVO:68378271
UT WOS	000417809200001
EID SCOPUS	85038612206
DOI	10.1088/1361-6463/aa9b11
Anotace	Self-organized layers of anodic TiO2 nanotubes were investigated by time-resolved terahertz spectroscopy in the steady state and upon photoexcitation. The interpretation of the conductivity spectra is based on the response of confined charges calculated by the Monte-Carlo method and on the evaluated distribution of the probing terahertz electric field in the heterogeneous structure. We show that the charge motion perpendicular to the nanotube axis is confined on ~10 nm scale, and that the charge mobility inside these confinement areas is comparable to that observed in a bulk anatase crystal. The electrical connectivity between individual nanotubes assessed from the terahertz spectra qualitatively correlates with the geometry observed in SEM images. The measured transient terahertz transmission spectra feature an apparent resonance. We demonstrate that it is not a signature of a new low-energy excitation but a geometrical effect of Fabry–Pérot interferences in the photoexcited slab.
Pracoviště	Fyzikální ústav
Kontakt	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Rok sběru	2019

Počet záznamů: 1