Abstract
Herein, we report the successful synthesis of two types of Co3O4 nanostructures, i.e., urchin-shaped and nanoneedle bundles. The prepared nanomaterials were synthesized via facile hydrothermal and subsequent heat treatment process at 300 degrees C. The structure and morphologies of both prepared materials were thoroughly characterized using different analytical tools and finally, the prepared nanomaterials were used as electron mediators to fabricate high-sensitive hydrazine chemical sensors. The detailed sensing studies revealed that the fabricated sensors based on Co3O4 urchin-shaped and nanoneedle bundles exhibited high sensitivity and low-detection limit. The detailed sensing performances such as sensitivity, detection limit, and linear range for the fabricated hydrazine chemical sensors were comprehensively compared. The results exhibited that the Co3O4 urchin-shaped structures based hydrazine sensor showed wider linear range (5-610 mu M) and lower detection limit (1.29 mu M), however, the Co3O4 nanoneedle bundles based hydrazine sensor exhibited higher sensitivity (95.25 mu A.mM(-1)).