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A study on the NO2 gas sorption ability of amorphous Ge33Se67 coated quartzcrystal microbalance (QCM) is presented. The thin films have been characterizedbefore and after sorption/desorption processes of NO2 by energy-dispersiveX-ray spectroscopy (EDS), grazing angle X-ray diffraction (GAXRD), Ramanspectroscopy, X-ray photoelectron spectroscopy (XPS) and atom force microscopy(AFM) measurements. These studies indicated that physisorption occurs when NO2gas molecules are introduced into the chalcogenide film and the thin filmcomposition or structure do not change. The mass loading due to NO2 gassorption was calculated by the resonator's frequency shift. At the conditionsof our experiment, up to 6.8 ng of the gas was sorbed into 200nm thick Ge33Se67film at 5000 ppm NO2 concentration. It has been established that the process ofgas molecules sorption is reversible.

NO2 Gas Sorption Studies of Ge33Se67 Films Using Quartz Crystal Microbalance