Effect of zinc:cobalt composition in ZnCo2O4 spinels for highly selective liquefied petroleum gas sensing at low and high temperatures

Kalpana B. Gawande, Sandeep B. Gawande, Sanjay R. Thakare, Vivek R. Mate, Sunil R. Kadam, Bharat B. Kale, Milind V. Kulkarni

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Nano ZnCo2O4 mixed phase materials were synthesized at varying zinc and cobalt ratios such as 1:1, 1:1.5, 1:2, 1:2.5 and 1:3. With a change in composition from 1:1 to 1:2.5, the gas sensing response characteristics increased two times (from 40 to 77.5 kΩ), while at higher zinc cobalt composition (1:3) a saturation point is shown (about 80 kΩ). This shows that optimal cobalt loading (1:2.5) leads to a two times enhancement in redox ability (from 174 to 346 mmol) and number of active sites, and this upshot significantly helps the sensing response reach a much lower 10 ppm and increases the saturation point to a higher 60 ppm LPG concentration. Furthermore, nano ZnCo2O4 (with a zinc and cobalt ratio of 1:2.5) material exhibited an excellent response time (∼80-90 s), rapid recovery time (∼65-75 s), excellent repeatability (fourth cycle), good selectivity (for LPG), higher gas response (∼77.5 kΩ), lower as well as higher operating temperature (from 30 to 250°C). The results clearly reveal that by tuning cobalt composition in ZnxCo2-xO4, we can achieve maximum sensing efficiency and repeatability.

Original languageEnglish
Pages (from-to)40429-40436
Number of pages8
JournalRSC Advances
Volume5
Issue number50
DOIs
StatePublished - 1 Jan 2015
Externally publishedYes

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