Cristin-resultat-ID: 1905390
Sist endret: 10. november 2021, 09:45
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

Enhanced gas sensing response for 2D α-MoO3 layers: thickness-dependent changes in defect concentration, surface oxygen adsorption, and metal-metal oxide contact

Bidragsytere:
  • Prashant Bisht
  • Arvind Kumar
  • Ingvild Julie Thue Jensen
  • Mujeeb Ahmad
  • Branson Belle og
  • Bodh Mehta

Tidsskrift

Sensors and actuators. B, Chemical
ISSN 0925-4005
e-ISSN 1873-3077
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Volum: 341
Artikkelnummer: 129953
Open Access

Importkilder

Scopus-ID: 2-s2.0-85104698817

Beskrivelse Beskrivelse

Tittel

Enhanced gas sensing response for 2D α-MoO3 layers: thickness-dependent changes in defect concentration, surface oxygen adsorption, and metal-metal oxide contact

Sammendrag

In this study, α-MoO3 two-dimensional (2D) layers and thin films were synthesized using pulsed laser deposition technique. X-ray diffraction and Raman spectroscopy confirm the formation of anisotropic α-MoO3. Atomic Force Microscopy images show the evolution of morphology from 2D layers to oriented crystallite growth with increase in film thickness. Temperature and gas concentration dependent, gas sensing response has been observed to be quite different in 2D layers in comparison to thin film sample. 2D α-MoO3 layers (∼ 6 nm) show higher response of about 25 % at a lower temperature (100 °C); They exhibit lower detection limits (up to 100 ppb) and selectivity towards NO2 gas. Also, 2D layers show p-type gas sensing response and nonlinear current-voltage (I–V) characteristics of metal- metal oxide junctions, in complete contrast to thin film sample, which shows an n-type gas sensing response and linear I–V characteristics. The results have been explained on the basis of lower oxygen defect concentration, enhanced oxygen adsorption at the surface, and metal- α-MoO3 contact favoring hole conduction.

Bidragsytere

Prashant Bisht

  • Tilknyttet:
    Forfatter
    ved Indian Institute of Technology, Delhi

Arvind Kumar

  • Tilknyttet:
    Forfatter
    ved Indian Institute of Technology, Delhi

Ingvild Julie Thue Jensen

  • Tilknyttet:
    Forfatter
    ved Bærekraftig energiteknologi ved SINTEF AS

Mujeeb Ahmad

  • Tilknyttet:
    Forfatter
    ved Indian Institute of Technology, Delhi

Branson Delano Belle

Bidragsyterens navn vises på dette resultatet som Branson Belle
  • Tilknyttet:
    Forfatter
    ved Bærekraftig energiteknologi ved SINTEF AS
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