Detail publikace

ZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Properties

TOMIC, M. CLAROS VARGAS, M. GRÁCIA, I. FIGUERAS, E. CANÉ, C. VALLEJOS VARGAS, S.

Originální název

ZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Properties

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Zinc oxide rod structures are synthetized and subsequently modified with Au, Fe2O3, or Cu2O to form nanoscale interfaces at the rod surface. X-ray photoelectron spectroscopy corroborates the presence of Fe in the form of oxide-Fe2O3; Cu in the form of two oxides-CuO and Cu2O, with the major presence of Cu2O; and Au in three oxidation states-Au3+, Au+, and Au-0, with the content of metallic Au being the highest among the other states. These structures are tested towards nitrogen dioxide, ethanol, acetone, carbon monoxide, and toluene, finding a remarkable increase in the response and sensitivity of the Au-modified ZnO films, especially towards nitrogen dioxide and ethanol. The results for the Au-modified ZnO films report about 47 times higher response to 10 ppm of nitrogen dioxide as compared to the non-modified structures with a sensitivity of 39.96% ppm(-1) and a limit of detection of 26 ppb to this gas. These results are attributed to the cumulative effects of several factors, such as the presence of oxygen vacancies, the gas-sensing mechanism influenced by the nano-interfaces formed between ZnO and Au, and the catalytic nature of the Au nanoparticles.

Klíčová slova

zinc oxide; gold; iron oxide; copper oxide; interfaces; Schottky junctions; heterojunctions; gas sensing; nitrogen dioxide

Autoři

TOMIC, M.; CLAROS VARGAS, M.; GRÁCIA, I.; FIGUERAS, E.; CANÉ, C.; VALLEJOS VARGAS, S.

Vydáno

30. 6. 2021

Nakladatel

MDPI

Místo

BASEL

ISSN

1424-8220

Periodikum

SENSORS

Ročník

21

Číslo

13

Stát

Švýcarská konfederace

Strany od

1

Strany do

24

Strany počet

24

URL

https://www.mdpi.com/1424-8220/21/13/4509

Plný text v Digitální knihovně

http://hdl.handle.net/11012/202245

BibTex

@article{BUT172780,
  author="Milena {Tomic} and Martha Carmiňa {Claros Vargas} and Isabel {Grácia} and Eduard {Figueras} and Carles {Cané} and Stella {Vallejos Vargas}",
  title="ZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Properties",
  journal="SENSORS",
  year="2021",
  volume="21",
  number="13",
  pages="1--24",
  doi="10.3390/s21134509",
  issn="1424-8220",
  url="https://www.mdpi.com/1424-8220/21/13/4509"
}