Highly Sensitive and Selective PbTiO 3 Gas Sensors with Negligible Humidity Interference in Ambient Atmosphere

Xing Hua Ma, Hua Yao Li, Sang Hyo Kweon, Seong Yong Jeong, Jong Heun Lee, Sahn Nahm

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Three PbTiO 3 nanostructures were synthesized using a one-step hydrothermal reaction with different TiO 2 powders as Ti sources, and their gas-sensing properties were investigated. The sensor comprising PbTiO 3 nanoplates (NPs) exhibited a high response (resistance ratio = 80.4) to 5 ppm ethanol at 300 °C and could detect trace concentrations of ethanol down to 100 ppb. Moreover, the sensor showed high ethanol selectivity and nearly the same sensing characteristics despite the wide range of humidity variation from 20 to 80% RH. The mechanism for humidity-independent gas sensing was elucidated using diffuse reflectance infrared Fourier transform spectra. PbTiO 3 NPs are new and promising sensing materials that can be used for detecting ethanol in a highly sensitive and selective manner with negligible interference from ambient humidity.

Original languageEnglish
Pages (from-to)5240-5246
Number of pages7
JournalACS Applied Materials and Interfaces
Volume11
Issue number5
DOIs
Publication statusPublished - 2019 Feb 6

Keywords

  • ethanol
  • gas sensor
  • humidity interference
  • PbTiO nanoplate
  • selectivity

ASJC Scopus subject areas

  • Materials Science(all)

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