Zr6O4(OH)4 Based Metal-Organic Frameworks for the Enhanced Chemiresistive Sensing of Ethanol

Because of their special qualities, metal-organic frameworks, or MOFs, have drawn a lot of interest for their potential in chemiresistive ethanol sensing. Three distinct MOF materials Zr6O4(OH)4(TPA-NH2)6, Zr6O4(OH)4TPA6, and Zr6O4(OH)4NDCA6 were thoroughly examined and fabricated in this work to determine which was most appropriate for use in ethanol sensing applications. According to Tauc plot analysis, Zr6O4(OH)4(TPA-NH2)6 had the lowest optical band gap energy, 3.79 eV. FTIR spectroscopy further showed the various vibrational modes in each MOF, with Zr6O4(OH)4(TPA-NH2)6, exhibiting peculiar absorption peaks at 488 and 767 cm− 1. Dynamic light scattering provided information on Zr6O4(OH)4(TPA-NH2)6 particle size distribution. Moreover, Zr6O4(OH)4(TPA-NH2)6 demonstrated remarkable sensitivity in chemiresistive ethanol sensing, as it continuously had the strongest sensor response at various ethanol concentrations. Zr6O4(OH)4(TPA-NH2)6 was found to have the lowest limit of detection (8.69 ppm) in LOD study, indicating that it is very sensitive to ethanol. Zr6O4(OH)4(TPA-NH2)6 was shown to be the most selective for ethanol based on selectivity testing. Zr6O4(OH)4(TPA-NH2)6 exhibited the fastest response time and most effective recovery, as seen by their response and recovery times. These results offer important new understandings of the properties and functionality of MOFs for chemiresistive ethanol sensing, with Zr6O4(OH)4(TPA-NH2)6 showing great promise.