Physico-Chemical nanomaterials science

Investigation of photoluminescent properties of MgO and Ga2O3 nanopowders for gas sensor applications
Venhryn Yu.I.1, Serednytski A.S.1, Popovych D.I.1
1 Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NAS of Ukraine. Naukova str., 3b, Lviv-79060, Ukraine.
E-mail: popovych@iapmm.lviv.ua

The study of structural, morphological and photoluminescent properties of magnesium oxide, gallium trioxide nanopowders and its mixes obtained using pulsed laser reactive technology [1] is carried out. Fig.1 shows the room temperature photoluminescent 
	
Fig.1. Photoluminescent spectra in air and vacuum (12 Pa) of MgО nanopowders.	
spectra of MgO nanoparticles with excitation wavelength at 365 nm. Main emission peak located at about 480 nm is can be ascribed to recombination processes resulting from the formation of oxygen vacancy complexes. For Ga2O3 main emission band located at about 440 nm. Changing the gas environment leads to a significant change in the intensity of the spectra and its deformation for both metal oxides, that can be used in the gas sensors [2]. The use of mixed metal oxides (MgO/Ga2O3) leads to improve sensitivity, enhanced adsorption ability, extensive catalytic activity, and high thermodynamic stability which is of considerable interest to the gas sensing.

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