Improved Capacitive Performance and Polarization Sustainability of Silver Stannate Nanoparticles: The Role of Carbon Nitride Incorporation

A wet chemical, complexation-mediated route has been applied for the synthesis of organic molecule-stabilized silver stannate, Ag₂SnO₃ (ASO), nanoparticles. The system was functionalized with carbon nitride (ASO-CN). Both the systems (ASO and ASO-CN) were designed in the form of devices for the measurement of dielectric, ac conductivity, impedance, and electric field-induced polarization properties. The enhancement of the capacitive performance was noticed due to the incorporation of carbon nitride to silver stannate. The ac conductivity study showed small polaron tunneling and correlated barrier hopping types of the conduction mechanism for both ASO- and ASO-CN-based devices. A fatigue-free electric field-induced polarization hysteresis loop was observed at ±1 and ±5 kV/mm field conditions for ASO and ASO-CN systems and attained the maximum polarization values of 0.05 and 0.31 μC/cm², respectively, for 10³ cycles. The time-dependent polarization stability was analyzed for 10³ s for both the devices. The sustainability of the ASO-CN-based device was higher compared with that of the ASO-based system.