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High-performance photoluminescence-based oxygen sensing with Pr-modified ZnO nanofibers

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)922-928
Number of pages7
JournalApplied Surface Science
Early online date6 Apr 2019
DateSubmitted - 13 Feb 2019
DateAccepted/In press - 4 Apr 2019
DateE-pub ahead of print - 6 Apr 2019
DatePublished (current) - 31 Jul 2019


Praseodymium (Pr)-modified zinc oxide (ZnO) nanofibers have been fabricated using an electrospinning-calcination method. These Pr-modified ZnO nanofibers present porous morphologies containing numerous ZnO nanocrystallites with average sizes that are much smaller than those found in pure ZnO nanofibers formed by the same procedures. Most Pr is identified at the surface of / interface between the nanocrystallites. In addition to the morphological modifications, addition of Pr is also shown to enhance the crystalline quality of the ZnO. Consequently, the Pr-modified ZnO nanofibers have a higher UV emission efficiency and exhibit a much-enhanced UV emission-based O 2 sensing performance than the pure ZnO nanofibers. By way of illustration, the Pr-modified nanofibers show O 2 sensing responses of R = 39% at room temperature and R = 71% at 115 °C (cf. R = 19% and 52% with the pure ZnO nanofibers at these same operating temperatures). These results suggest that electrospun Pr-modified ZnO nanofibers hold real promise for high-performance optical gas sensing applications.

    Research areas

  • Electrospinning, Gas sensing, Nanofibers, Photoluminescence, Praseodymium, Zinc oxide



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