A mems _-preconcentrator employing a carbon molecular sieve membrane for highly volatile organic compound sampling

Hung Yang Kuo, Wei Riu Cheng, Tzu Heng Wu, Horn Jiunn Sheen, Chih Chia Wang, Chia Jung Lu

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents the synthesis and evaluation of a carbon molecular sieve membrane (CMSM) grown inside a MEMS-fabricated μ-preconcentrator for sampling highly volatile organic compounds. An array of µ-pillars measuring 100 µm in diameter and 250 µm in height were fabricated inside a microfluidic channel to increase the attaching surface for the CMSM. The surface area of the CMSM was measured as high as 899 m2/g. A GC peak amplification factor >2 × 104 was demonstrated with gaseous ethyl acetate. Up to 1.4 L of gaseous ethanol at the 100 ppb level could be concentrated without exceeding the capacity of this microchip device. Sharp desorption chromatographic peaks (<3.5 s) were obtained while using this device directly as a GC injector. Less volatile compounds such as gaseous toluene, m-xylene, and mesitylene appeared to be adsorbed strongly on CMSM, showing a memory effect. Sampling parameters such as sample volatilities, sampling capacities, and compound residual issues were empirically determined and discussed.

Original languageEnglish
Article number104
JournalChemosensors
Volume9
Issue number5
DOIs
Publication statusPublished - 2021 May

Keywords

  • Carbon molecular sieve membrane
  • MEMS
  • Preconcentration
  • VOCs

ASJC Scopus subject areas

  • Analytical Chemistry
  • Physical and Theoretical Chemistry

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