Synthesis, characterizations, and hydrogen sulfide gas sensing application of BiOx (x = 1, 1.5) nanostructures

• Published in: International journal of hydrogen energy 2023-01, Vol.48 (2), p.840-848
• Main Authors: Bhalerao, Krishna D., Nakate, Yogesh T., Choudhury, Sandip P., Nakate, Umesh T., Yewale, M.A., Kadam, S.L., Ingole, R.S., Kulkarni, S.C., Khollam, Y.B.
• Format: Article
• Language: English
• Subjects: Bismuth oxide; Gas sensor; Hydrogen sulfide; Hydrothermal synthesis; Nanosheets
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2022.09.235

Hydrogen sulfide is one of the harmful gases that contribute to air pollution. Therefore, there is a need to develop high-response hydrogen sulfide (H₂S) gas sensors. Herein, the bismuth oxide nanostructured material was prepared using the hydrothermal chemical route. The prepared material was characterized using XRD, FESEM, TEM, XPS, EDS, and UV–visible spectroscopy techniques. The gas sensor device was fabricated using bismuth oxide nanomaterial, and gas sensing properties were investigated. The sensor exhibited the highest response of 22–92% towards H₂S gas at 250 °C for 10–100 ppm concentration range, respectively. The 92% response was recorded for 100 ppm H2S gas with rapid response and recovery times of 511 and 492 s, respectively. The sensor was tested at different operating temperatures and H2S gas concentrations. The sensor's selectivity, dynamic resistance response repeatability, and long-term (30 days) stability were studied. The nanostructured bismuth oxide can be a promising candidate for high-response H₂S sensor applications. [Display omitted] •2D Nanosheets structured BiOxvia hydrothermal technique and characterizations.•BiOx sensor exhibiting high response and good selectivity towards H2S gas at 250 °C.•BiOx sensor highly sensed in H2S gas concentration 10–100 ppm at 250 °C.•BiOx sensor shows dynamic sensor resistance response with excellent repeatability.•BiOx sensor shows long term stability.