Photoconductive, dielectric and percolation properties of anodic TiO2 nanotubes studied by terahertz spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39911317" target="_blank" >RIV/00216275:25310/18:39911317 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/18:00489478

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1361-6463/aa9b11" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6463/aa9b11</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6463/aa9b11" target="_blank" >10.1088/1361-6463/aa9b11</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photoconductive, dielectric and percolation properties of anodic TiO2 nanotubes studied by terahertz spectroscopy

Popis výsledku v původním jazyce

Self-organized layers of anodic TiO2 nanotubes were investigated using 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.

Název v anglickém jazyce

Photoconductive, dielectric and percolation properties of anodic TiO2 nanotubes studied by terahertz spectroscopy

Popis výsledku anglicky

Self-organized layers of anodic TiO2 nanotubes were investigated using 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physics D: Applied Physics

ISSN

0022-3727

e-ISSN

1361-6463

Svazek periodika

51

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

014004

Kód UT WoS článku

000417809200001

EID výsledku v databázi Scopus

2-s2.0-85038612206