| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 104 === Abstract
A self-assembly miniaturized dielectric barrier discharge plasma has applied for the detection of volatile organic gas molecules in this experiment. This miniaturized plasma detector was made by inserting a stainless steel capillary column into a glass tube and sealed it inside a glass tube, then tangled an electric wire around the glass tube. A high-voltage alternating current was applied on both electrodes, a stable plasma was generated under atmospheric pressure. In this experiment , we use argon as a carrier gas to detect signal. When volatile organic gas molecules passed through the plasma, they would reacted with argon ions in the plasma, caused an obviously change in the background voltage of argon plasma. This research further investigated the correlation of the distance between the electrode and plasma, flow rate and voltage to the response of detector ,to find the optimum condition in each variables. When organic gas molecules with different functional groups, such as: alkanes, alcohols, ketones, esters, aromatics and halide passed through the argon plasma ,they all caused an obviously change in the signal. And the intensity of the signal would gradually increased followed by the increasing of the length of carbon chain of organic compounds. The lowest detection limit of this detector for iso-butanol was 1.61 ng. This detector has the advantages of small volume, low cost, and would showed a significant change in the intensity of the signal when organic gas molecules passed through the plasma, therefore, it can be applied for the detection of volatile organic gas molecules.
Key words：dielectric barrier、atmospheric plasma、gas chromatography
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