Sol–gel electrospun mesoporous ZnMn2O4 nanofibers with superior specific surface area
Abstract
ZnMn2O4 has application potential in lithium ion batteries, supercapacitors, sensors, and thermistors. In this study, mesoporous spinel ZnMn2O4 nanofibers were synthesized by sol–gel assisted electrospinning combined with calcination, using poly(styrene-co-acrylonitrile) as sacrificial polymeric binder. Structural, morphological and optical properties of these ceramic nanofibers were characterized. X-ray diffraction and X-ray photoelectron spectroscopy results revealed the presence of hexagonal ZnMnO3 and MnO phases in the ZnMn2O4 nanofibers produced. Based on these observations we propose a plausible mechanism of formation of ZnMn2O4 nanofibers. The nanofibers calcined at 773 K exhibit a specific surface area of 79.5 m2 g−1, which is higher than that of the zinc manganite nanofibers synthesized hitherto by sol–gel electrospinning. Moreover, this material exhibits four bandgaps, which is believed to be the first observation in ZnMn2O4 nanofibers.
Notes
Acknowledgements
Shamitha C would like to thank the department of metallurgical and materials engineering, National Institute of Technology of Karnataka (NITK), India for a research fellowship. The authors thank Ms. U. Rashmi for her valuable assistance in scanning electron microscopy and SAIF Cochin for their kind assistance in high resolution transmission electron microscopy and UV–vis-NIR spectroscopy.
Funding
This research received no specific funding from any funding body.
Supplementary material
References
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