The Physico-Chemical Nanomaterials Science

Photoluminescent properties of doped ZnO nanopowders for gas sensors
Venhryn Yu.I., Bovhyra R.V., Savka S.S., Serednytski A.S.,Popovych D.I.
Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NAS of Ukraine. Naukova str., 3b, Lviv-79060, Ukraine. 
E-mail: venhrunyura@gmail.com
In this work carried out research the features of photoluminescence of the doped (In, Si, Ge, Mg) ZnO nanopowders in vacuum and various gaseous ambient. The nanopowders were obtained using pulsed laser reactive technology, doping was carried out by pulsed laser deposition of a thin film on nanopowders surface with further activation by laser annealing. The XRD and SEM methods were used for structural and morphological characterization of obtained nanopowders. The photoluminescence spectra measured in gas and in vacuum at room temperature (fig.1.) shows that luminescence intensity in visible region depends on the ambient atmosphere. All spectra has two bands in visible region which are sensitive to ambient gas, a blue-band centered at 430 nm and stronger in intensity the yellow band around 525 nm, that can be used in the gas sensors [1]. Also, photoluminescence spectra were measured under different excitation energies. Changing the excitation energies can excite different surface adsorption electronic states and significantly increase the selectivity and sensitivity of the gas analysis. 

		a)					b)
Fig.1. Photoluminescent spectrum of ZnO nanopowders doped In (a) and Si (b) in air and vacuum.

1.	Zhyrovetsky V.M., Popovych D.I., Savka S.S., Serednytski A.S. Nanopowder Metal Oxide for Photoluminescent Gas Sensing // Nanoscale Research Letters. -2017 –12. -P.132(5).