Navale, Shalaka C. ; Ravi, V. ; Srinivas, D. ; Mulla, I. S. ; Gosavi, S. W. ; Kulkarni, S. K. (2008) EPR and DRS evidence for NO2 sensing in Al-doped ZnO Sensors and Actuators B: Chemical, 130 (2). pp. 668-673. ISSN 0925-4005
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09254...
Related URL: http://dx.doi.org/10.1016/j.snb.2007.10.055
Abstract
Zinc oxide (ZnO) is a well-known semiconducting multifunctional material wherein properties right from the morphology to gas sensitivity can be tailor-made by doping or surface modification. Aluminum (Al)-incorporated porous zinc oxide (Al:ZnO) exhibits good response towards NO2 at low-operating temperature. The NO2 gas concentration as low as 20 ppm exhibits S = 17% for 5 wt.% Al-incorporated ZnO. The NO2 response increases with operating temperature and concentration and reaches to its maximum at 300 °C without any interference from other gases such as SO3, HCl, LPG and alcohol. Physico-chemical characterization likes differential thermogravimetric analysis (TG-DTA) electron paramagnetic resonance (EPR) and diffused reflectance spectroscopy (DRS) have been used to understand the sensing behavior for pure and Al-incorporated ZnO. The TG-DTA depicts formation of ZnO phase at 287 °C. The EPR study reveals distinct variation for O- (g = 2.003) and Zn interstitial (g = 1.98) defect sites in pure and Al:ZnO. The DRS studies elucidate signature of adsorbed NOx species in aluminium-incorporated zinc oxide indicating its tendency to adsorb these species even at low temperatures. This paper is an attempt to correlate the gas sensing behavior with the physico-hemical studies such as EPR and DRS.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
Keywords: | NO Sensor; EPR; DRS; Aluminum Doping; ZnO |
ID Code: | 17941 |
Deposited On: | 17 Nov 2010 13:28 |
Last Modified: | 04 Jun 2011 08:38 |
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