Hexagonal ZnO nanoplates/graphene composites with excellent sensing performance to NO2 at room temperature

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

4 Scopus Citations
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Author(s)

  • Jinniu Zhang
  • Yuhong Huang
  • Xiaolin Zhang
  • Hongbing Lu
  • Kewei Xu
  • Fei Ma

Detail(s)

Original languageEnglish
Article number147785
Journal / PublicationApplied Surface Science
Volume537
Online published7 Sep 2020
Publication statusPublished - 30 Jan 2021

Abstract

Metal oxides with high-energy facets usually have more active surface sites to facilitate gas adsorption. In this work, the ZnO/graphene composites are synthesized hydrothermally and the morphology of ZnO nanoparticles can be changed from nanorods to nanoplates with the high-energy {0001} polar surface exposed by changing the density of sodium citrate in the reaction. The ZnO{0001}/graphene composites have better sensing properties to NO2 at room temperature (RT). Based on first-principles calculation, the adsorption energy of NO2 on the ZnO{0001} facet is more negative than that on the {011¯0} surface indicating stronger interactions between the former and NO2. Furthermore, the ZnO{011¯0} surface shows semiconducting characteristics, whereas the ZnO{0001} polar surface is metallic. The metallic characteristics promote charge transfer at the interface between ZnO and graphene and enhance the NO2 detection sensitivity.

Research Area(s)

  • Graphene, Metallic characteristics, Semiconducting characteristics, ZnO{0001} polar surface

Citation Format(s)

Hexagonal ZnO nanoplates/graphene composites with excellent sensing performance to NO2 at room temperature. / Zhang, Lizhai; Zhang, Jinniu; Huang, Yuhong; Xu, Huiyan; Zhang, Xiaolin; Lu, Hongbing; Xu, Kewei; Chu, Paul K.; Ma, Fei.

In: Applied Surface Science, Vol. 537, 147785, 30.01.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review