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-salt02859nas a2200241   4500008004100000022001400041245013900055210006900194260000800263300001600271490000700287520198900294100002102283700001902304700001902323700001902342700001802361700002802379700003102407700002002438700003002458856012902488       2025                        eng d  a2050-748800aHighly moisture-stable ferroelectric ammonium phosphate salt showing piezoelectric energy harvesting and rotation sensing applications0 aHighly moisturestable ferroelectric ammonium phosphate salt show  cJUL  a22574-225820 v133 a<p>
	Ferroelectric phosphate-based materials are known for their biocompatibility, dipole switching, and high thermal stability. In this context, we report a novel organic ferroelectric material, diisopropylammonium bis(4-nitrophenyl) phosphate (DIPABNPP), crystallizing in the monoclinic C2 space group. DIPABNPP exhibits a high second harmonic generation (SHG) efficiency 2.5 times higher than that of potassium dihydrogen phosphate (KDP). The ferroelectric nature of DIPABNPP was confirmed by the observation of a rectangular P-E hysteresis loop, which gave a saturated polarization value of 6.82 mu C cm-2. The ferroelectric polar domains of DIPABNPP, along with the bias-dependent amplitude butterfly and phase hysteresis loops, were visualized by piezoresponse force microscopy (PFM). Furthermore, the polydimethyl siloxane (PDMS) composites of DIPABNPP enabled the fabrication of humidity-resistant piezoelectric nanogenerators (PENGs) with energy harvesting and mechanical-electrical sensing capabilities. The top-performing 10 wt% DIPABNPP-PDMS device achieved a peak output voltage of 9.5 V and a charge storage efficiency of 81.8%, successfully powering 53 LEDs. Additionally, its rapid response time of 18.5 ms enables precise rotation sensing capabilities, suggesting potential applications in motion monitoring, such as revolution per minute (RPM) counting. We also present a unique and refined method for obtaining the output work efficiency (OWE) parameter, which quantifies the ratio of harvested electrical energy to the maximum elastic energy stored in the composite device, taking into consideration several key parameters during the PENG measurements. For the 10 wt% DIPABNPP-PDMS composite, an OWE of 13.1% was achieved, highlighting both its current performance and potential for optimization. This metric provides a standardized approach for evaluating PENGs, addressing a critical gap in assessing mechanical-to-electrical energy conversion efficiency.</p>
1 aKushwaha, Vikash1 aPrajesh, Neetu1 aGopal, Animesh1 aSahoo, Supriya1 aDeswal, Swati1 aKirana, Antonysylvester1 aShanmuganathan, Kadhiravan1 aZareba, Jan, K.1 aBoomishankar, Ramamoorthy  uhttps://library.ncl.res.in/content/highly-moisture-stable-ferroelectric-ammonium-phosphate-salt-showing-piezoelectric-energy