02217nas a2200289   4500008004100000022001400041245007500055210006900130260000900199300001400208490000700222520131600229653001501545653002201560653002101582653002301603653001801626100001901644700001901663700001801682700002501700700002001725700002001745700003101765700003001796856010101826       2021                        eng d  a1861-472800a Flexible energy harvester from an organic ferroelectric ammonium salt0 aFlexible energy harvester from an organic ferroelectric ammonium  cDEC   a4122-41290 v163 aOrganic ferroelectrics due to their low cost, easy preparation, light weight, high flexibility and phase stability are gaining tremendous attention in the field of portable electronics. In this work, we report the synthesis, structure and ferroelectric behavior of a two-component ammonium salt 2, containing a bulky [Bn(4-BrBn)NMe2](+) (Bn=benzyl and 4-BrBn=4-bromobenzyl) cation and tetrahedral (BF4)(-) anion. The structural analysis revealed the presence of rich non-classical C-H...F and C-H...Br interactions in this molecule that were quantified by Hirshfeld surface analysis. The polarization (P) vs. electric field (E) hysteresis loop measurements on 2 gave a remnant polarization (P-r) of 14.4 mu C cm(-2) at room temperature. Flexible polymer composites with various (5, 10, 15 and 20) weight percentages (wt%) of 2 in thermoplastic polyurethane (TPU) were prepared and tested for mechanical energy harvesting applications. A notable peak-to-peak output voltage of 20 V, maximum current density of 1.1 mu A cm(-2) and power density of 21.1 mu W cm(-2) were recorded for the 15 wt% 2-TPU composite device. Furthermore, the voltage output generated from this device was utilized to rapidly charge a 100 mu F capacitor, with stored energies and measured charges of 156 mu J and 121.6 mu C, respectively.10aDielectric10aenergy harvesting10aferroelectricity10aorganic composites10apiezoelectric1 aGupta, Rishabh1 aSahoo, Supriya1 aDeswal, Swati1 aKothavade, Premkumar1 aDixit, Prashant1 aZareba, Jan, K.1 aShanmuganathan, Kadhiravan1 aBoomishankar, Ramamoorthy  uhttps://library.ncl.res.in/content/flexible-energy-harvester-organic-ferroelectric-ammonium-salt02643nas a2200313   4500008004100000022001400041245012700055210006900182260000800251300001600259490000700275520158000282653001601862653001501878653002201893653002101915653002101936100001901957700002301976700002501999700002402024700003002048700002302078700002002101700001802121700003102139700003002170856012902200       2024                        eng d  a1944-824400aHighly electrostrictive salt cocrystal and the piezoelectric nanogenerator application of its 3D-printed polymer composite0 aHighly electrostrictive salt cocrystal and the piezoelectric nan  cMAY  a26406-264160 v163 a<p>
	Ionic cocrystals with hydrogen bonding can form exciting materials with enhanced optical and electronic properties. We present a highly moisture-stable ammonium salt cocrystal [CH3C6H4CH(CH3)NH2][CH3C6H4CH(CH3)NH3][PF6] ((p-TEA)(p-TEAH)PF6) crystallizing in the polar monoclinic C2 space group. The asymmetry in (p-TEA)(p-TEAH)PF6 was induced by its chiral substituents, while the polar order and structural stability were achieved by using the octahedral PF6- anion and the consequent formation of salt cocrystal. The ferroelectric properties of (p-TEA)(p-TEAH)PF6 were confirmed through P-E loop measurements. Piezoresponse force microscopy (PFM) enabled the visualization of its domain structure with characteristic ``butterfly'' and hysteresis loops associated with ferro- and piezoelectric properties. Notably, (p-TEA)(p-TEAH)PF6 exhibits a large electrostrictive coefficient (Q(33)) value of 2.02 m(4) C-2, higher than those found for ceramic-based materials and comparable to that of polyvinylidene difluoride. Furthermore, the composite films of (p-TEA)(p-TEAH)PF6 with polycaprolactone (PCL) polymer and its gyroid-shaped 3D-printed composite scaled-up device, 3DP-Gy, were prepared and evaluated for piezoelectric energy-harvesting functionality. A high output voltage of 22.8 V and a power density of 118.5 mu W cm(-3) have been recorded for the 3DP-Gy device. Remarkably, no loss in voltage outputs was observed for the (p-TEA)(p-TEAH)PF6 devices even after exposure to 99% relative humidity, showcasing their utility under extremely humid conditions.</p>
10a3D printing10acocrystals10aenergy harvesting10aferroelectricity10aPiezoelectricity1 aSahoo, Supriya1 aPanday, Rishukumar1 aKothavade, Premkumar1 aSharma, Vijay, Bhan1 aSowmiyanarayanan, Anirudh1 aPraveenkumar, Balu1 aZareba, Jan, K.1 aKabra, Dinesh1 aShanmuganathan, Kadhiravan1 aBoomishankar, Ramamoorthy  uhttps://library.ncl.res.in/content/highly-electrostrictive-salt-cocrystal-and-piezoelectric-nanogenerator-application-its-3d