ZnO nanorods based hydrazine sensors.

Electrochemical sensor for the detection of hydrazine has been fabricated at the surface of gold electrode modified with ZnO nanorods. The ZnO nanorods were grown by non-catalytic simple thermal evaporation process by using metallic zinc powder in the presence of oxygen at low-temperature. The detailed structural studies revealed that the as-grown ZnO nanorods are well-crystalline with the wurtzite hexagonal phase and grown along the [0001] direction in preference. A good and reproducible sensitivity of 4.76 microA cm(-2) microM(-1) has been obtained from the fabricated hexagonal-shaped ZnO nanorods based electrochemical sensor. The response time of the fabricated sensor was less than 10 s with a linear range from 0.2 to 2.0 microM and correlation coefficient of R = 0.9914. The limit of detection (LOD), based on S/N ratio was estimated to be 2.2 microM.