Hierarchical Dense Array of ZnO Nanowires Spatially Grown on ZnO/TiO2 Nanofibers and Their Ultraviolet Activated Gas Sensing Properties

Published on Jan 9, 2020in Journal of Physical Chemistry C4.126
· DOI :10.1021/ACS.JPCC.9B07207
Mir Mehdi Hashemi3
Estimated H-index: 3
(UT: University of Tehran),
Alireza Nikfarjam14
Estimated H-index: 14
(UT: University of Tehran)
+ 1 AuthorsNahideh Salehifar6
Estimated H-index: 6
(UT: University of Tehran)
Sources
Abstract
Three-dimensional heterostructure using selective growth of ZnO nanowires on TiO2/ZnO nanocomposite nanofiber by novel combination of post seeding method in electrospinning process and hydrothermal technique is presented in this work. Hierarchical dense array of ZnO nanowires with diameter of 70-120 nm and aspect ratio of about 10 on TiO2/ZnO composite nanofibers (ZnO@TiO2/ZnO) was fabricated. XRD, UV-Vis, FESEM, HRTEM, TEM, EDX and XPS analysis were used for characterization of nanofibers. The results demonstrate of about 4 times enhancement in UV spectrum absorption in the range of 240-300 nm compared to the non-hierarchical structures. It was found that, optimized operating temperature for TiO2/ZnO nanofibers were 260◦C and 240◦C in dark and under UV illumination. Results showed that ZnO@TiO2/ZnO exhibit about 3 times improvement in gas sensitivity with UV irradiation for 10ppm to 200ppm of ethanol gas with reduced response and recovery times. UV illuminated ZnO@TiO2/ZnO had about 3.81 times and 4.30 t...
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