Nanojunction effects in multiple ZnO nanowire gas sensor

The effects of nanojunctions in multiple ZnO nanowire sensors were investigated in terms of the electrical properties, the sensor response, and the rate characteristic of sensor response based on a comparison against single nanowire sensors. Due to the effects of nanojunctions, the multiple nanowire devices showed reduced gating effects as an electrical characteristic and an enhanced sensor response in hydrogen detection as compared to single nanowire device. On the other hand, it was found that the sensor response rate in multiple nanowires was affected by gas diffusion inside the nanojunctions. The effect of the nanojunctions on the rate characteristics of the sensor response was quantified from simplified kinetic-diffusion modeling based on the kinetic information of the single nanowire.