Quartz crystal microbalance determination of vapors of volatile organic compounds on carbon nanotubes under batch conditions

摘要

Specific features of the sorption of vapors of monoatomic aliphatic alcohols and aromatic com- pounds on coatings formed from carbon nanotubes of various genesis studied by the method of piezoelectric micro weighing are considered. The morphology of the coatings is considered in dependence on the condi- tions of synthesis and aftertreatment of carbon nanotubes. A new method of the processing of signals from an array piezoelectric sensors is proposed; it allows an increase in the selectivity of the determination of volatile organic compounds in an equilibrium gas phase by 2-2.5 times. The advantages of the application of carbon nanotubes as sorption coatings in comparison to the standard polymeric sorbents for piezoelectric micro weighing are demonstrated: The detection limit decreases by 4-15 times and the duration of measurement by 5-55 times.