Influence of Zn-substitution on structural, morphological, electrical, and gas sensing properties of ZnxAl2O4 (x = 0.1 to 0.5) synthesized by a sol-gel auto-combustion method. Issue 5 (1st March 2021)

• Record Type: Journal Article
• Authors: Tikare, Rina R.; Powar, Rohit R.; Parale, Vinayak G.; Park, Hyung-Ho; Shinde, Tukaram J.; Kanase, Dhanaji G.
• Is Part Of: Ceramics international. Volume 47:Issue 5(2021)
• Page Start: 6779
• Page End: 6789
• Publication Date: 2021-03-01
• Subjects: Sol-gel auto-combustion method -- XRD -- FTIR -- TEM -- Selectivity -- Gas sensor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.11.021
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The nanosphere decorated needle-like morphology of zinc-substituted aluminate having general formula Zn x Al2 O4 ( x = 0.1, 0.2, 0.3, 0.4, and 0.5) (ZAN) samples were synthesized by a sol-gel auto-combustion method. The phase formation and stability temperature were confirmed by TG-DTA analysis. XRD study confirmed the formation of a cubic spinel structure of ZAN samples. The effect of Zn-substitution on structural and morphological properties of aluminate were investigated using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), Field emission scanning electron microscopy (FESEM), and Energy dispersive X-ray analysis (EDAX). The D.C. electrical resistivity study of ZAN samples revealed that resistance decreased with increasing temperature confirmed semiconducting nature. Nanosphere existing on micro-needles of zinc-substituted aluminate gas sensor revealed sensing to several analyte gases such as H2 S, Cl2, CH3 OH, SO2, and NO2 working at room temperature to 300 ° C. The Zn0·4 Al2 O4 compositional gas sensor produced the highest response at operating temperature 200 ° C to 100 ppm H2 S. The results revealed that the prepared nanosphere decorated needles of the ZAN sensor was sensitive and selective to H2 S gas.