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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 |
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