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.