Electrical response on the nickel-ion containing organic–inorganic hybrid system for the sensing of dopamine

A complexation mediated route has been applied for the synthesis of Ni(II)-HMDA (hexamethylenediamine) hybrid system and the synthesized complex material was tailored as a sensing platform of dopamine. The electric field induced polarization study exhibited the hysteresis loop for Ni(II)-HMDA and with the gradual addition of dopamine to the complex, a steady increase of maximum polarization value of the loop was noticed. The increment of the polarization hysteresis loops were associated with the ligand exchange mechanism between HMDA and dopamine. The dopamine sensing performance of Ni(II)-HMDA hybrid system was further studied using the dielectric capacitance, AC-conductivity measurement and impedimetric techniques.