02154nas a2200265   4500008004100000022001400041245005700055210005600112260006900168300001200237490000800249520136900257653002001626653000801646653000801654653001501662653000801677100002401685700001301709700001701722700002201739700001901761700002101780856008701801       2008                        eng d  a0925-400500aEPR and DRS evidence for NO2 sensing in Al-doped ZnO0 aEPR and DRS evidence for NO2 sensing in Aldoped ZnO  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR  a668-6730 v1303 a<p>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 (AI: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 degrees 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 A]-incorporated ZnO. The TG-DTA depicts formation of ZnO phase at 287 degrees 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 NO, 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-chemical studies such as EPR and DRS. (c) 2007 Published by Elsevier B.V.</p>10aaluminum doping10aDRS10aEPR10aNO2 sensor10aZnO1 aNavale, Shalaka, C.1 aRavi, V.1 aSrinivas, D.1 aMulla, Imtiaz, S.1 aGosavi, S., W.1 aKulkarni, S., K.  uhttps://library.ncl.res.in/content/epr-and-drs-evidence-no2-sensing-al-doped-zno-0