Kilogram-scale synthesis of Pd-Loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors and their application to ultrasensitive and ultraselective detection of methylbenzenes

Ji Wook Yoon, Young Jun Hong, Gi Dae Park, Su Jin Hwang, Faissal Abdel-Hady, AbdulAziz A. Wazzan, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We report the kilogram-scale, simple, and cost-effective synthesis of Pd-loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors by spray drying of aqueous droplets containing cobalt nitrate, palladium nitrate, citric acid, and ethylene glycol and subsequent heat treatment. Highly viscous gel spheres containing Co and Pd salts were successfully converted into multi thin-shelled Co<inf>3</inf>O<inf>4</inf> reactors uniformly loaded with Pd catalysts by the sequential combustion of carbon and decomposition of the metal salts from the outer to the inner regions during one-step heat treatment. The responses (resistance ratio) of the Pd-loaded quintuple-shelled Co<inf>3</inf>O<inf>4</inf> microreactors to 5 ppm toluene and p-xylene were 30.8 and 64.2, respectively, and the selectivity values to toluene and p-xylene against ethanol interference (response ratio) were 14.5 and 30.1, respectively. The unprecedented high response and selectivity were attributed to the effective dissociation of less reactive methylbenzenes into more active smaller species assisted both by catalytic Co<inf>3</inf>O<inf>4</inf> and Pd during the prolonged retention within the microreactors. Kilogram-scale preparation of noble metal-loaded multishelled microreactors and their unique gas-sensing characteristics based on a novel microreactor concept can pave a new way to design of high-performance gas sensors for practical applications.

Original languageEnglish
Pages (from-to)7717-7723
Number of pages7
JournalACS Applied Materials and Interfaces
Volume7
Issue number14
DOIs
Publication statusPublished - 2015 Apr 15

Keywords

  • gas sensor
  • kilogram-scale preparation
  • methylbenzenes
  • Pd-loaded Co<inf>3</inf>O<inf>4</inf>
  • selectivity
  • yolk-shell microreactor

ASJC Scopus subject areas

  • Materials Science(all)

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