A volatile organic compound sensor using porous Co3O4 spheres

Tae Hyung Kim, Ji Wook Yoon, Jong Heun Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Porous Co3O4 spheres with bimodal pore distribution (size: 2-3 nm and ∼ 30 nm) were prepared by ultrasonic spray pyrolysis of aqueous droplets containing Co-acetate and polyethylene glycol (PEG), while dense Co3O4 secondary particles with monomodal pore distribution (size: 2-3 nm) were prepared from the spray solution without PEG. The formation of mesopores (∼ 30 nm) was attributed to the decomposition of PEG. The responses of a porous Co3O4 sensor to various indoor air pollutants such as 5 ppm C2H5OH, xylene, toluene, benzene, and HCHO at 200°C were found to be significantly higher than those of a commercial sensor using Co3O4 and dense Co3O4 secondary particles. Enhanced gas response of porous Co3O4 sensor was attributed to high surface area and the effective diffusion of analyte gas through mesopores (∼ 30 nm). Highly sensitive porous Co3O4 sensor can be used to monitor various indoor air pollutants.

Original languageEnglish
Pages (from-to)134-138
Number of pages5
JournalJournal of the Korean Ceramic Society
Volume53
Issue number2
DOIs
Publication statusPublished - 2016 Mar 1

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Keywords

  • CoO
  • Gas sensor
  • Spray pyrolysis
  • Volatile organic compound

ASJC Scopus subject areas

  • Ceramics and Composites

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