Dual-Functional One-Pot Synthesized Au-Y-TMA MOF Hybrid: an Electrode Modifier for High-Performance Symmetric Supercapacitor and Kanamycin Aptasensor for Spiked Milk Samples.

In this study, a one-pot hydrothermal synthesis method was used to synthesize a novel gold-yttrium trimesic acid metal-organic framework (Au-Y-TMA MOF), demonstrating significant improvements over conventional single-metal MOFs, that is, yttrium trimesic acid (Y-TMA), in both supercapacitor applications and electrochemical antibiotic detection. The X-ray diffraction patterns of Au-Y-TMA confirmed the presence and impact of Au in the Y-TMA matrix, while field emission scanning electron microscopy (FE-SEM) images revealed a heterogeneous combination of gold nanoparticles (AuNPs) and Y-TMA, suggesting a nonuniform distribution and possible interaction. The developed half-cell supercapacitor exhibited a remarkable capacitance value of 1836 F/g at a current density of 5 A/g by galvanostatic charging-discharging (GCD) measurement. The symmetric full-cell device achieved a capacitance value of 99.85 F/g at a current density of 1 A/g, with an 82% retention value for 10000 GCD curve cycles. The device also demonstrated an energy density of 8.85 Wh/kg, power density of 3.6 kW/kg, and 97% Coulombic efficiency, highlighting the superior performance of Au-Y-TMA in supercapacitor applications. Moreover, a thiolate aptamer (aptSH) was immobilized on the surface of the Au-Y-TMA electrode. Results showcased selective, sensitive (5.82%/nM), and reproducible determination of kanamycin with a detection limit of 1.14 nM. Moreover, the recovery rates of milk samples treated with kanamycin, which varied from 87% to 91%, demonstrated their practical viability. Raman-active spectroscopic analysis was performed to inculcate the kanamycin detection mechanism of the electrode. This study advances scientific understanding and underscores the potential for significant societal impact by improving energy storage technologies and ensuring food safety through sensitive antibiotic detection.