NO₂ Gas Sorption Studies of Ge₃₃Se₆₇ Films Using Quartz Crystal Microbalance

Authors

Velichka Georgieva, Bulgarian Academy of Sciences
Maria Mitkova, Boise State UniversityFollow
Ping Chen, Boise State UniversityFollow
Dmitri Tenne, Boise State UniversityFollow
Kasandra Wolf, Boise State University
Victoria Gadjanova, Bulgarian Academy of Sciences

Document Type

Article

Publication Date

12-14-2012

DOI

http://dx.doi.org/10.1016/j.matchemphys.2012.09.057

Abstract

A study on the NO₂ gas sorption ability of amorphous Ge₃₃Se₆₇ coated quartz crystal microbalance (QCM) is presented. The thin films have been characterized before and after sorption/desorption processes of NO₂ 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 NO₂ gas molecules are introduced into the chalcogenide film and the thin film composition or structure do not change. The mass loading due to NO₂ gas sorption was calculated by the resonator’s frequency shift. At the conditions of our experiment, up to 6.8 ng of the gas was sorbed into 200 nm thick Ge₃₃Se₆₇ film at 5000 ppm NO₂ concentration. It has been established that the process of gas molecules sorption is reversible.

Publication Information

Georgieva, Velichka; Mitkova, Maria; Chen, Ping; Tenne, Dmitri; Wolf, Kasandra; and Gadjanova, Victoria. (2012). "NO₂ Gas Sorption Studies of Ge₃₃Se₆₇ Films Using Quartz Crystal Microbalance". Materials Chemistry and Physics, 137(2), 552-557.