| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 84 === A cryptand 22 coated piezoelectric quartz crystal
membranesensor with a home-made computer interface was prepared
andapplied as a GC-detector for variousorganic molecules.The
frequency of quartz crystal oscillator decrease due to
theadsorption of organic molecules on cryptand 22.The computer
interface includes the counting interrupt with Intel-8255 andthe
frequency measured with Intel-8254.A software was written to
control the interface and data acquisition. At first,effects
of functional group,molecule weight,steric hindrance and
polarity of organic molecules in bothstatic and flow cells on
frequency respones of thepiezoelectric crystal had been
investigated.The cryptand piezoelectric crystal gas
chromatographic detector demonstratedhigh sensitivity and good
reproducibility.The frequency shiftof various organic molecules
were in the order:R-COOH >> R--NH2 > R-OHand 10 amine (R-NH2) >
20 amine (R2-NH) > 30 amine (R3-N) and morepolarity molecules
had better response. The home-made cryptand piezoelectric
crystal gas chromatographicdetector with detection limits
2.38x10-6g for polar molecular showedgood competitivity with
respect to commercial TCD.
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