Detail publikace

Investigating the thickness-effect of free-standing high aspect-ratio TiO2 nanotube layers on microwave-photoresponse using planar microwave resonators

ALIJANI, M. WILTSHIRE, B. SOPHA, H. SARPANAH, Z. MISTRÍK, J. HROMÁDKO, L. ZARIFI, M. MACÁK, J.

Originální název

Investigating the thickness-effect of free-standing high aspect-ratio TiO2 nanotube layers on microwave-photoresponse using planar microwave resonators

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

One-dimensional TiO2 nanotube (TNT) layers are a promising candidate for UV detection due to their distinctive anisotropic geometry which is effective for light harvesting and rapid carrier transport. Here, the photosensitivity efficiency of TNT layers with various thicknesses of 15, 50, 80, and 110 mu m was utilized at a microwave frequency regime by modeling and experimentally. A planar microwave split ring resonator (PMSRR) was designed and fabricated to operate at -8 GHz to study TNT layers by monitoring the scattering parameter (S21) of the PMSRR under a constant UV irradiation power of -96.4 mu W/cm2. According to the results, the 80 mu m thick TNT layers demonstrated the highest resonant amplitude variation for the customized PMSRR. The change of the resonant amplitude was mainly attributed to the conductivity variation contributed by perturbation of trapped electron concentration, as the dominant factor under UV illumination, and their electromagnetic wave interaction. The main advantage of the proposed method of PMSRR for microwave photosensitivity monitoring over the conventional direct current (DC) conductivity measurements is to eliminate the effect of contact resistance between the TNT layers and metal electrodes utilizing the contactless aspect of wave interactions with the TNT layers at microwave regime to perform electrode-less measurements.

Klíčová slova

Planar microwave resonator; TiO2; Nanotube; Real-time microwave sensing; UV detection

Autoři

ALIJANI, M.; WILTSHIRE, B.; SOPHA, H.; SARPANAH, Z.; MISTRÍK, J.; HROMÁDKO, L.; ZARIFI, M.; MACÁK, J.

Vydáno

1. 6. 2023

Nakladatel

Elsevier

Místo

AMSTERDAM

ISSN

2352-9407

Periodikum

Applied Materials Today

Ročník

32

Číslo

1

Stát

Nizozemsko

Strany od

1

Strany do

10

Strany počet

10

URL

https://www.sciencedirect.com/science/article/pii/S2352940723001026

Plný text v Digitální knihovně

http://hdl.handle.net/11012/213686

BibTex

@article{BUT183947,
  author="Mahnaz {Alijani} and Benjamin D. {Wiltshire} and Hanna Ingrid {Sopha} and Zahra {Sarpanah} and Jan {Mistrík} and Luděk {Hromádko} and Mohammad H. {Zarifi} and Jan {Macák}",
  title="Investigating the thickness-effect of free-standing high aspect-ratio TiO2 nanotube layers on microwave-photoresponse using planar microwave resonators",
  journal="Applied Materials Today",
  year="2023",
  volume="32",
  number="1",
  pages="10",
  doi="10.1016/j.apmt.2023.101832",
  issn="2352-9407",
  url="https://www.sciencedirect.com/science/article/pii/S2352940723001026"
}