The Physico-Chemical Nanomaterials Science

The peculiarities of doped ZnО nanopowders 
luminescence in gas 
Venhryn Yu.I., Savka S.S., Bovhyra R.V., 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

Fig.1. PL spectra in air and vacuum (8 Pa) of Ca doped ZnO nanopowders.	
The research peculiarities of photoluminescence (PL) in vacuum and various gas of the doped (Ca, Ga, In, Ni, Al, Cu) ZnO nanopowders is carried out. The nanopowders were obtained using pulsed laser reactive technology [1], 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. Fig.1 shows the room temperature PL spectra of the Ca-doped ZnO nanoparticles measured with excitation wavelength at 375 nm. 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 [2]. The visible emissions observed may be ascribed to the intrinsic defects and oxygen vacancies. Large surface area and surface defects are the most important variables to determine the sensory properties of ZnO nanopowders and making them are the most favorable material for gas sensors.

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