The adsorption properties of polyvinylcarbazole (PVC) films as sensitive layers of quartz crystal microbalance (QCM) sensors have been studied. Different organic vapors and complex mixture (a cologne) were tested as analytes. PVC films have demonstrated different adsorption properties under different temperatures. This makes it a perspective material for sensor applications.

Індекс рубрикатора НБУВ: Г471.8

Рубрики:

Хроматографія газів. Газорідинна хроматографія

Шифр НБУВ: Ж41115 Пошук видання у каталогах НБУВ 

This work reports on the results of numerical calculations of quartz microbalance (QCM) sensors response under adsorption of analyte molecules. The influence of share modulus and viscosity has been studied. It was shown that even in the case of sufficiently thin films (hundreds of nanometers), the viscosity effects can significantly affect the sensor response during adsorption. In the case of sufficiently thick layers, the viscosity effects can turn out to radically change the response of QCM to the adsorption of volatile molecules. Thus, utilizing QCM-based sensors in viscous medium it is necessary to take into account not only mass loaded (adsorbed) onto quartz surface but also effect of viscosity on sensor response.

This work reports on the investigation of sensory properties of thiacalix[4]arene molecules towards volatile halogen-aromatic compounds. Experiments were carried out using the 8-channel sensory system based on Quartz Crystal Microbalance (QCM) technique. Kinetic responses, concentration dependences and detection limit have been obtained. It has been shown that interaction of the sensitive layer with the analyte molecules is substantially defined by the chemical structure of thiacalix[4]arene. Thus, thiacalix[4]arene materials considered in this paper are of great interest for application in the sensory systems of "Electronic Nose" type.