02982nas a2200241   4500008004100000245017100041210006900212260000900281300001400290490000600304520201700310653004302327653002802370653003502398653002502433653002502458100002102483700001702504700002302521700003102544700003502575856013002610       2024                        eng d00aPolymer nanocomposites with UiO-derived zirconia fillers for energy generation and pressure-sensing devices: the role of crystal structure and surface characteristics0 aPolymer nanocomposites with UiOderived zirconia fillers for ener  cMAR   a5809-58180 v73 a<p>
	Piezoelectric energy harvesting and pressure sensing using polymer nanocomposites have opened up promising avenues in the field of flexible electronics. Herein, the influence of varying crystal structures of zirconia nanoparticles on a piezoelectric energy-generating zirconia-poly(vinylidene difluoride) (PVDF) composite is investigated, and the fabrication of a security alert pavement unit using the material with an optimized composition is demonstrated. More specifically, two metal-organic frameworks, UiO-66 and UiO-67, were employed to synthesize four different types of zirconia nanoparticles with precise control of the monoclinic and tetragonal phases. Polymer nanocomposite with monoclinic zirconia nanoparticles derived from UiO-66 (ZrO2-66m) performed better than other derivatives with 61% enhancement in the beta phase with respect to pure PVDF. It was hypothesized that the stable crystalline structure of the monoclinic phase might act as a better nucleating agent, and among monoclinic derivatives, ZrO2-66m was found to be more hydrophobic, probably enabling a better interaction with PVDF. Subsequently, a prototype device with a PVDF-ZrO2-66m (P/66m) film was made and tested for its energy generation. The maximum output voltage generated by the device under an irregular biomechanical hand tapping force of 8-9 N was 80 V, while the maximum open circuit current was found to be 65 mu A. The prototype displayed a power of 2162.24 mu W at a load resistance of 1 M Omega. A laboratory scale demonstration was executed with the prototype as an energy-generating and security alert pavement unit. A wireless, Bluetooth-based security alert system supported by an Android application was developed and demonstrated as a promising application with the fabricated prototype. The results and demonstrations validate that the PVDF-monoclinic ZrO2 nanoparticle nanocomposites will be an excellent value addition for flexible, durable energy generation and pressure-sensing applications.</p>
10aenergy generation and pressure sensing10apiezoelectric materials10aPVDF/ZrO2 polymernanocomposite10aself-powered devices10awearable electronics1 aMukherjee, Gargi1 aVerma, Ankur1 aMadhu, Arjun, Hari1 aPrasad, Bhagavatula, L. V.1 aKarumuthil, Subash, Cherumanni  uhttps://library.ncl.res.in/content/polymer-nanocomposites-uio-derived-zirconia-fillers-energy-generation-and-pressure-sensing