A nanometer gaped gas sensor with the colloid Pani

Colloid type conducting polymer forms a networking structure for electron move between its nanometer particles [1], Therefore, a nanometer gas sensor or a quantum dot using the colloidal conducting polymer may be possible. In this paper, we fabricated the nanometer gaped chemo type gas sensor. The Au electrodes with the nanometer gaps were made by electromigration. The colloid type conducting polymer (PAni) was used for the reaction matrix of the gas sensor. Resistance, I-V curves, was measured for the response of the gas sensor to NH3 gas. The results showed the resistance overall decreased to about 50% in the gas. The step type I-V curves, which are similar to those of a tunneling effect often observed at low temperatures, was observed in the NH₃ ⁺ gas environment.