Highly sensitive SnO2/Co3O4 nanocomposite materials for H2S gas sensor application

Abstract
The development of practical and adaptable hydrogen sulfide (H2S) detection equipment for air quality monitoring remains challenging. Owing to their remarkable electronic band alignment and excellent features, p-n heterojunction-based sensing technology has attracted significant interest in H2S gas sensors. In this study, n-type tin oxide/p-type cobalt oxide (n-SnO2/p-Co3O4) heterojunctions were fabricated using a metal precursor solution, followed by a straightforward hydrothermal method using pure Co3O4 and molar ratios of SnO2/Co3O4 = 0.18, SnO2/Co3O4 = 0.35, and SnO2/Co3O4 = 0.55. The synthesized samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HR-TEM), Brunauer–Emmett–Teller (BET) analysis, and X-ray photoelectron spectroscopy (XPS) to evaluate their structural, morphological, and chemical properties, and surface areas.

Author
Dyana Aziz Bayz

DOI
https://doi.org/10.1016/j.jiec.2025.08.020

ISSN
1876-794X

Publish Date: 10-Aug-2025