| Summary: | 碩士 === 國立臺灣師範大學 === 化學學系 === 85 ===
Fullerene(C60) coated piezoelectric quartz crystal membrane detectors in the gas and liquid systems, were prepared and applied the interaction between fullerene and various organic molecules.This study included two parts.Firstly, fullerene (C60) coated piezoelectric quartz crystal membrane gas detector was designed to detect organic vapors adsorbed on C60/quartz membrane, which compare with β-carotene and pyrene simultaneously.Secondly, fullerene coated piezoelectric liquid detector was prepared for long carbon chain organic molecules.Sensor with a home -made microcomputer interface for signal acquisition and data processing.
In the study with piezoelectric gas detector, the affinity of C60 to organic molecules with various function group, e.g. aldehydes(RCHO), ketones(RCOR'), acids(RCOOH), amines(RNH2), alcohols(ROH) was investigated.The sensitivity for various coating material was found to be in the order: β-carotene>C60>pyrene.The selectivity order of C60 coated crystal for various organic molecules seems to be in the order:Acid>Aldehyde>Amine>Alcohol>Ketone.Only amines seem to perform chemical adsorption on C60 piezoelectric membrane while physical adsorption is found in all another cases.The selectivity of β-carotene for various organic molecules was toi be in the order:Acid>Aldehyde>Amine>Alcohol>Ketone.Aldehydes and amines seem to perform chemical adsorption.All these organic molecules are extremely weak affinity to pyrene with physical adsorption.The adsorbed ability of alkyne on C60, β-carotene and pyrene membrane is much greater than alkenes or alkanes.The adsorption rate of various organic molecules with these coating materials was also investigated and showed to be in the order:C60>β-carotene>pyrene.
The selectivities of C60、βl-carotene and pyrene coated crytals for various organic molecules in the gas flow system.Showed quite in accordance with that in the stationary system.The sensitivity of O3 pre-reacted C60、β-carotene and pyrene coated crystals for various organic molecules in the flow system was also investigated.
In the study with liquid piezoelectric detector, Fullerene (C60) coated piezoelectric quartz crystal liquid detector was prepared and applied to detect various long carbon chain organic molecules in solutions.The selectivity of C60 coated crystal seems to be in the order: Amine>Acid>Aldehyde>Ketone.In addition, the longer carbon chain molecules exhibited the greater frequency shift probably due to stronger adsorption on the quartz crystal.
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