Here, a zinc-based metal–organic framework-decorated graphene oxide (MOF@GO) nanocomposite was synthesized and incorporated within a polyacrylonitrile (PAN) nanofibrous filter to enhance the particulate matter (PM) removal efficiency. For this purpose, the PAN nanofibrous filters containing different contents of the MOF@GO nanocomposite (PAN/MOF@GO) were fabricated, and their morphology was studied using field-emission scanning electron microscopy. The results revealed the formation of uniform and bead-free nanofibers with the MOF@GO wrapping tightly around them. The resultant nanofibrous filters were evaluated for PM removal and possible breath monitoring. The results revealed good mechanical properties with freestanding ability and hydrophobic behavior of the PAN/MOF@GO nanofibrous filters, indicating the possibility of long-term application in high humidity conditions. More importantly, the optimized PAN/MOF@GO nanofibrous filter exhibited a high PM filtration efficiency (95.13%), low pressure drop (15.29 Pa), and superior quality factor (0.198 Pa–1). Moreover, the electrical resistance of the PAN/MOF@GO nanofibrous filter changed with different breathing patterns, indicating the possibility of using the developed nanofibrous filter for human respiration monitoring. This work provides new insights into the fabrication of nanofibrous filters with boosted performance for PM removal by the synergistic effect of GO and MOF particles.

I. INTRODUCTIONRecently, Electronic textiles (E-textiles) based on piezoelectric properties have gained tremendous attention based on the piezoelectric effect with the ability to convert mechanical energy into electricity and vice versa. poly vinylidene fluoride (PVDF) as a Polymeric Piezoelectric Materials (PPM) have many advantages over Ceramics Piezoelectric Materials (CPM) such as flexibility, low processing cost, biocompatibility, high chemical resistance and other properties. To improve the piezoelectric performance of PVDF for sensor application, the amount of electroactive crystalline phases, specially the β-phase with the largest spontaneous polarization, should be enhanced [1][2][3][4][5].Various studies showed that the incorporation of piezoelectric nano materials was found to be efficient for improving the piezoelectric properties of PVDF-based nanofibrous mat. Examples include nano-clay [6], zinc oxide (ZnO) particle [7], Co-doped ZnO [8], Metal Organic Frameworks (MOFs) [9] and TiO2 [10] which their piezoelectric enhancing effect has been shown, recently.Recently, porous crystalline materials consisting of organic ligands and metal ions, called Metal-organic frameworks (MOFs), linked through coordination bonds have been attended. These nanostructures have attracted a lot of interest in a wide range of applications [11][12][13][14] Due to their superior unique structural features including high porosity, tunable pore size, specific surface area and versatile performance.