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A passive, membrane-mediated, microfabricated vapor extractor (μVE) chip for collecting volatile organic compounds (VOC) from water and biofluids is presented. Its performance when interfaced to a micro-scale gas chromatograph (μGC) prototype is demonstrated. A mixture of 4 VOCs spiked into synthetic urine at ppm concentrations was extracted by the 2.8×2.3 cm μνΕ chip from a 700-μL sample in 3.5 min,...
In this paper, we present a robust and adaptable technique to integrate microfluidics with an on-chip thiolate-monolayer-protected gold nanoparticle coated chemiresistorarray for vapor analyte detection in a micro-scale gas chromatograph (μGC). The process involves mounting a sensing chip and capillary tubes within a silicon “extension carrier” (EC), capping the chemiresistor-array with a glass lid,...
Use of electron-beam induced crosslinking (EBIX) to pattern films of thiolate-monolayer-protected gold-nanoparticles (MPNs) on chemiresistor (CR) vapor sensors is described. MPNs with alkyl, cyanoalkyl, phenoxyalkyl, and hydroxyfluoroalkyl thiolate tail groups were patterned on integrated arrays of interdigital electrodes using electron doses of 500-750 μC/cm2. The dc resistances of solvent cast films...
In comprehensive two-dimensional gas chromatography (GC??GC), a modulator is placed at the juncture between two separation columns to focus and re-inject eluting mixture components, and thereby enhance the selectivity, sensitivity, and analyte capacity. Here, we present the design, fabrication, and testing of a two-stage microscale thermal modulator (??TM). The ???? cryogenically trap analytes eluting...
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