A preconcentrator chip employing μ-SPME array coated with in-situ-synthesized carbon adsorbent film for VOCs analysis

Ming Yee Wong, Wei Rui Cheng, Mao Huang Liu, Wei Cheng Tian, Chia Jung Lu

研究成果: 雜誌貢獻文章同行評審

19 引文 斯高帕斯(Scopus)

摘要

We report the design, fabrication, and evaluation of a μ-preconcentrator chip that utilizes an array of solid-phase microextraction (SPME) needles coated with in-situ-grown carbon adsorbent film. The structure of the SPME needle (diameter=100 μm, height=250 μm) array inside the sampling chamber was fabricated using a deep reactive-ion etching (DRIE) process to enhance the attachable surface area for adsorbent film. Heaters and temperature sensors were fabricated onto the back of a μ-preconcentrator chip using lithography patterning and a metal lift-off process. The devices were sealed by anodic bonding and diced prior to the application of the adsorbent film. An adsorbent precursor, cellulose was dissolved in water and dynamically coated onto the SPME needle array. The coated cellulose film was converted into a porous carbon film via pyrolysis at 600 °C in a N2 atmosphere. The surface area of the carbon adsorbent film was 308 m2/g, which is higher than that of a commercial adsorbent Carbopack X. A preconcentration factor as high as 13,637-fold was demonstrated using toluene. Eleven volatile organic compounds (VOCs) of different volatilities and functional groups were sampled and analyzed by GC-FID, and the desorption peak widths at half height were all less than 2.6 s after elution from a 15 m capillary GC column. There was no sign of performance degradation after continuous operation for 50 cycles in air.

原文英語
頁(從 - 到)307-313
頁數7
期刊Talanta
101
DOIs
出版狀態已發佈 - 2012 十一月 15

ASJC Scopus subject areas

  • Analytical Chemistry

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