Stability and Sensing Enhancement by Nanocubic CeO2 with {100} Polar Facets on Graphene for NO2 at Room Temperature

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

8 Scopus Citations
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Author(s)

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

Detail(s)

Original languageEnglish
Pages (from-to)4722-4731
Journal / PublicationACS Applied Materials and Interfaces
Volume12
Issue number4
Online published2 Jan 2020
Publication statusPublished - 29 Jan 2020

Abstract

Metal oxides with a polar surface interact strongly with polar NO2 molecules, thus facilitating sensitive detection of NO2. In this work, the composites comprising graphene and cubic CeO2 nanoparticles with the {100} polar surface are prepared by a hydrothermal technique, and they exhibit fast response, excellent selectivity, stable recovery, and sensitive detection with a low detection limitation of 1 ppm for NO2 at room temperature. According to the first-principle calculations, the adsorption energy of NO2 on the CeO2{100} polar surface is the most negative corresponding to the strongest interactions between them. The formation energy of oxygen vacancies (Ov) on the {100} polar plane is also negative, and the abundant Ov facilitates the adsorption of NO2. The internal electric field near the polar surface promotes the charge separation and accelerates the charge exchange between NO2 and the composites. In addition, graphene promotes electron transfer at the interface and improves the stability of the CeO2{100} polar surface. The composites of graphene and metal oxides with a polar surface are excellent for NO2 detection, and the discovery reveals a new sensing strategy.

Research Area(s)

  • CeO2{100} polar surface, heterojunction, internal electric field, polar NO2 molecular, polarity compensation, stability

Citation Format(s)

Stability and Sensing Enhancement by Nanocubic CeO2 with {100} Polar Facets on Graphene for NO2 at Room Temperature. / Zhang, Lizhai; Zhang, Jinniu; Huang, Yuhong; Xu, Huiyan; Zhang, Xiaolin; Lu, Hongbing; Xu, Kewei; Chu, Paul K.; Ma, Fei.

In: ACS Applied Materials and Interfaces, Vol. 12, No. 4, 29.01.2020, p. 4722-4731.

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