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author:

Cong, J. (Cong, J..) [1] | Duan, P. (Duan, P..) [2] | Zhong, F. (Zhong, F..) [3] | Luo, Y. (Luo, Y..) [4] | Zheng, Y. (Zheng, Y..) [5] | Cai, G. (Cai, G..) [6] | Xiao, Y. (Xiao, Y..) [7] | Jiang, L. (Jiang, L..) [8]

Indexed by:

Scopus

Abstract:

The work showed a novel amperometric NH3 sensor based on SrM2O4 (M = Sm, La, Gd, Y) with CaFe2O4 type structural sensing electrode. A distinct B-site strategy was developed to prepare a series of semiconductor oxides SrM2O4 (M = Sm, La, Gd, Y) to establish the relationships between the band structure and sensing properties of the optimized sensing electrode. The structural analyses carried out by X-ray diffraction, scanning electron microscopy and Mott-Schottky curves confirm that four metal oxides SrM2O4 (M = Sm, La, Gd, Y) are all n-type semiconductors, and a preferential sensing mechanism of NH3 sensor was proposed by the combination of mass spectrometry track. The electrochemical results indicate that NH3 sensing properties are closely related to the band structure of the metal semiconductor oxides. Compared with the conduction band obtained from Mott-Schottky curves, it is the most negative for SrSm2O4 sensing electrode, suggesting that electrons are easier to overcome energy barriers over SrSm2O4. Consequently, the NH3 sensor with SrSm2O4 sensing electrode exhibits high sensitivity, quicker response/recovery speed, excellent selectivity and stability compared to other three sensors, exhibiting a great application prospects for SrSm2O4 sensing electrode used in the automotive equipments. © 2019 Elsevier B.V.

Keyword:

Band structure; CaFe2O4 type; NH3 sensors; Sensing properties; SrSm2O4 sensing electrode

Community:

  • [ 1 ] [Cong, J.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China
  • [ 2 ] [Duan, P.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China
  • [ 3 ] [Zhong, F.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China
  • [ 4 ] [Luo, Y.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China
  • [ 5 ] [Zheng, Y.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China
  • [ 6 ] [Cai, G.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China
  • [ 7 ] [Xiao, Y.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China
  • [ 8 ] [Jiang, L.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, Fuzhou, Fujian 350002, China

Reprint 's Address:

  • [Zhong, F.]National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Gongye Road No.523, China

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Source :

Sensors and Actuators, B: Chemical

ISSN: 0925-4005

Year: 2020

Volume: 303

6 . 3 9 3

JCR@2018

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 18

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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