In situ diffuse reflectance infrared spectroscopy (DRIFTS) study of the reversibility of CdGeON sensors towards oxygen

✍ Scribed by J.J. Benítez; M.A. Centeno; C.Louis dit Picard; O. Merdrignac; Y. Laurent; J.A. Odriozola

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 503 KB
• Volume: 31
• Category: Article
• ISSN: 0925-4005
• DOI: 10.1016/0925-4005(96)80066-9

✦ Synopsis

A novel diffuse reflectance infrared spectroscopy (DRIFTS) chamber, specially designed for in situ and simultaneous infrared and conductance analysis of sensors, is described in this paper. The capabilities of this new tool are shown through the study of the reversible behaviour versus temperature of a CdGeON sensor under N2 and synthetic-air atmospheres. The conductance of the sensor is directly related to the presence of DRIFTS bands at 810, 780 and 580 cm-~ assigned to oxygenated species directly bonded to single Ge atoms. These species are eliminated or restored in the solid network upon heating under N2 or synthetic air, respectively. From the analysis of the resistancetemperature Arrbenius-type relationships, the influence of the atmosphere on the conduction mechanism is discussed.