Humidity-Independent Gas Sensors Using Pr-Doped In2O3 Macroporous Spheres

Role of Cyclic Pr3+/Pr4+ Redox Reactions in Suppression of Water-Poisoning Effect

Jun Sik Kim, Chan Woong Na, Chang Hoon Kwak, Hua Yao Li, Ji Won Yoon, Jae Hyeok Kim, Seong Yong Jeong, Jong Heun Lee

Research output: Contribution to journalArticle

Abstract

Pure and 3-12 at. % Pr-doped In2O3 macroporous spheres were fabricated by ultrasonic spray pyrolysis and their acetone-sensing characteristics under dry and humid conditions were investigated to design humidity-independent gas sensors. The 12 at. % Pr-doped In2O3 sensor exhibited approximately the same acetone responses and sensor resistances at 450 °C regardless of the humidity variation, whereas the pure In2O3 exhibited significant deterioration in gas-sensing characteristics upon the change in the atmosphere, from dry to humid (relative humidity: 80%). Moreover, the 12 at. % Pr-doped In2O3 sensor exhibited a high response to acetone with negligible cross responses to interfering gases (NH3, CO, benzene, toluene, NO2, and H2) under the highly humid atmosphere. The mechanism for the humidity-immune gas-sensing characteristics was investigated by X-ray photoelectron and diffuse reflectance infrared Fourier transform spectroscopies together with the phenomenological gas-sensing results and discussed in relation with Pr3+/Pr4+ redox pairs, regenerative oxygen adsorption, and scavenging of hydroxyl groups.

Original languageEnglish
Pages (from-to)25322-25329
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number28
DOIs
Publication statusPublished - 2019 Jun 24

Fingerprint

Redox reactions
Chemical sensors
Atmospheric humidity
Acetone
Gases
Water
Sensors
Spray pyrolysis
Scavenging
Toluene
Carbon Monoxide
Photoelectrons
Benzene
Hydroxyl Radical
Fourier transform infrared spectroscopy
Deterioration
Ultrasonics
Oxygen
Adsorption
X rays

Keywords

  • cyclic redox reactions
  • humidity dependence
  • indium oxide
  • oxide semiconductor gas sensor
  • praseodymium

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Humidity-Independent Gas Sensors Using Pr-Doped In2O3 Macroporous Spheres : Role of Cyclic Pr3+/Pr4+ Redox Reactions in Suppression of Water-Poisoning Effect. / Kim, Jun Sik; Na, Chan Woong; Kwak, Chang Hoon; Li, Hua Yao; Yoon, Ji Won; Kim, Jae Hyeok; Jeong, Seong Yong; Lee, Jong Heun.

In: ACS Applied Materials and Interfaces, Vol. 11, No. 28, 24.06.2019, p. 25322-25329.

Research output: Contribution to journalArticle

Kim, Jun Sik ; Na, Chan Woong ; Kwak, Chang Hoon ; Li, Hua Yao ; Yoon, Ji Won ; Kim, Jae Hyeok ; Jeong, Seong Yong ; Lee, Jong Heun. / Humidity-Independent Gas Sensors Using Pr-Doped In2O3 Macroporous Spheres : Role of Cyclic Pr3+/Pr4+ Redox Reactions in Suppression of Water-Poisoning Effect. In: ACS Applied Materials and Interfaces. 2019 ; Vol. 11, No. 28. pp. 25322-25329.
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