@article { ISI:000255107700017,
	title = {EPR and DRS evidence for NO2 sensing in Al-doped ZnO},
	journal = {Sensors and Actuators B-Chemical},
	volume = {130},
	number = {2},
	year = {2008},
	month = {MAR},
	pages = {668-673},
	publisher = {ELSEVIER SCIENCE SA},
	type = {Article},
	address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND},
	abstract = {<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>},
	keywords = {aluminum doping, DRS, EPR, NO2 sensor, ZnO},
	issn = {0925-4005},
	doi = {10.1016/j.snb.2007.10.055},
	author = {Navale, Shalaka C. and Ravi, V. and Srinivas, D. and Mulla, Imtiaz S. and Gosavi, S. W. and Kulkarni, S. K.}
}
@article { ISI:000263509700027,
	title = {Selective oxidation of benzyl alcohol over copper phthalocyanine immobilized on MCM-41},
	journal = {Catalysis Letters},
	volume = {128},
	number = {3-4},
	year = {2009},
	month = {MAR},
	pages = {434-442},
	publisher = {SPRINGER},
	address = {233 SPRING ST, NEW YORK, NY 10013 USA},
	abstract = {<p>Copper phthalocyanine (CuPc) complexes immobilized on {\textquoteleft}{\textquoteleft}neat{\textquoteright}{\textquoteright} and Ti(4+) and Al(3+) containing MCM-41 mimic the functionality of metalloenzymes. These novel materials catalyze the oxidation of benzyl alcohol to selectively benzaldehyde at moderate temperatures using peroxides and molecular oxygen as oxidant. Electron paramagnetic resonance and X-ray photoelectron spectroscopic studies revealed that the acidity of the support (MCM-41) influences the electronic structure of the immobilized CuPc. On acidic supports a part of copper in CuPc got reduced from a {\textquoteleft}{\textquoteleft}formal{\textquoteright}{\textquoteright} +2 to +1 oxidation state. This reduction of copper in its oxidation state on different supports decreased in the order: Al-MCM-41 (Bronsted and strong Lewis acid sites) \&gt; MCM-41 (silanol sites) \&gt; Ti-MCM-41 (weak Lewis acid sites). A linear variation in catalytic activity with the concentration of Cu(1+) ions in different catalyst samples was observed. The study reveals that by suitably modifying the acidic properties of the support one can, in principle, fine-tune the electronic and catalytic properties of the active oxidation sites.</p>},
	keywords = {Copper phthalocyanine, EPR, MCM-41, Selective oxidation of benzyl alcohol, UV-visible spectroscopy},
	issn = {1011-372X},
	doi = {10.1007/s10562-008-9770-4},
	author = {Hamza, A. and Srinivas, D.}
}
