3D porous flower-like ZnO microstructures loaded by large-size Ag and their ultrahigh sensitivity to ethanol

Hao Wang, Qiang Li, Xiaokun Zheng, Chao Wang, Jiangwei Ma, Benben Yan, Zhinan Du, Mengyuan Li, Weijia Wang, Huiqing Fan

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57 Scopus citations

Abstract

3D porous flower-like ZnO microstructures loaded by large-size Ag were successfully synthesized via a simple two-stage method. XRD and XPS results proved that the synthesized Ag/ZnO was a pure phase. SEM and TEM results showed that the Ag nanoparticles with large size (about 400 nm) were successfully loaded on the porous flower-like ZnO. The sensitivity of Ag/ZnO was 268 to 200 ppm ethanol at 300 °C, which was 6 times higher than that of pure ZnO. In addition, the sensor of Ag/ZnO exhibited a faster response/recovery behavior and a lower detection limit. The enhanced gas sensing performance of Ag/ZnO has been explained from three aspects: the “spillover effect” of Ag, the formation of metal-semiconductor heterojunction and the role of “electronic sensitization”.

Original languageEnglish
Article number154453
JournalJournal of Alloys and Compounds
Volume829
DOIs
StatePublished - 15 Jul 2020

Keywords

  • Ethanol
  • Gas sensor
  • Large-size Ag
  • Porous flower-like ZnO

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