Mater.Phys.Mech.(MPM)
No 2, Vol. 13, 2012, pages 175-180

ZINC OXIDE TETRAPOD SYNTHESIS AND APPLICATION FOR UV SENSORS

S. Rackauskas, T. Talka, E.I. Kauppinen, A.G. Nasibulin

Abstract

Zinc oxide tetrapods (ZnO-Ts) were synthesized by air oxidation of zinc vapor. For stable production of the ZnO-Ts at the furnace temperatures of 900 C, the lowest evaporator temperature was found to be 480 C. Aerosol measurements showed that the fraction of naturally charged particles decreased with evaporator temperature from 89 % at 480 °C to 43 % at 420 °C. Various UV sensors were prepared to study the response and reset times and the On/Off ratio as a function of the ZnO-T concentrations, interelectrode distance and air humidity conditions. The presence of humid air was found to increase the conductivity of the ZnO-T sensors and to lower the response and reset times as well as On/Off ratio to 98, 96 and 88 %, respectively.

Keywords: ZnO; tetrapod; synthesis; UV sensor

full paper (pdf, 2256 Kb)