2012
DOI: 10.1016/j.matchemphys.2012.09.057
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NO2 gas sorption studies of Ge33Se67 films using quartz crystal microbalance

Abstract: A study on the NO 2 gas sorption ability of amorphous Ge 33 Se 67 coated quartz crystal microbalance (QCM) is presented. The thin films have been characterized before and after sorption/desorption processes of NO 2 by energy-dispersive X-ray spectroscopy (EDS), grazing angle X-ray diffraction (GAXRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and atom force microscopy (AFM) measurements. These studies indicated that physisorption occurs when NO 2 gas molecules are introduced into the chalcogen… Show more

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Cited by 6 publications
(7 citation statements)
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“…So, the sorption process of NO 2 in the Ge 20 Se 80 is physical in nature but the forces occurrying at it are strong enough to prevent its reversibility. Compared to the Ge 33 Se 67 [15] the studied films absorb lower amount of NO 2 which is in harmony with the reduced free volume predicted by the density and structural factor data.…”
Section: Discussionsupporting
confidence: 85%
See 1 more Smart Citation
“…So, the sorption process of NO 2 in the Ge 20 Se 80 is physical in nature but the forces occurrying at it are strong enough to prevent its reversibility. Compared to the Ge 33 Se 67 [15] the studied films absorb lower amount of NO 2 which is in harmony with the reduced free volume predicted by the density and structural factor data.…”
Section: Discussionsupporting
confidence: 85%
“…In other words, it is desirable to create active films as thick as possible, which are expected to absorb more gaseous molecules and still assure good resonance parameters of the QCM. The chalcogenide glasses have already been a subject of such studies [15] which revealed their possible applicability in the field of gas sensing and the physical nature of the sorption process.…”
Section: Theoretical Considerationsmentioning
confidence: 99%
“…Similarly, the minimal changes to the areal intensity of the Ge-Ge bond are also attributed to the near stoichiometric composition of these films. With increasing amount of Ge, as in the films, we suggest an effect similar to the swelling reported for amorphous Ge films [26] which occurs in order to reduce the packing density in the system, since it is very high for this composition [20]. This high compactness of the structure significantly increases the stress within the films.…”
Section: Discussionsupporting
confidence: 75%
“…7. [20]. Data regarding the molar volume was taken from [21] and packing fraction data was calculated according to [22].…”
Section: Resultsmentioning
confidence: 99%
“…This is characteristic for all studied compositions with small variations in the particular penetration depth, which depends upon the density of the chalcogenide glass ( Figure 7 ) which is one other factor to be considered. [ 51 ]…”
Section: Discussionmentioning
confidence: 99%