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In this paper, we report on thin film transistors based on gas phase synthesized ZnO nanoparticles using low temperature deposited silicon dioxide and silicon nitride as gate dielectrica. For bottom gate transistors, the devices using silicon nitride as gate insulator show the lowest off-current for a given induced charge and the steepest subthreshold slope. The charge carrier mobility of around 3x10-3 cm2/Vs and an Ion/Ioff ratio of around 105 are almost independent of the insulator material. In a double gated thin film transistor using low stress silicon nitride as top gate insulator, transistor parameters are extracted for the identical semiconducting layer when the bottom gate is used and when the top gate is used, respectively. It is shown that the extracted charge carrier mobil ity is not inherent for the ZnO nanoparticle layer but rather an effective value for the device under investigation