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Positron annihilation approved less amount of defect in ZnO: effect on the performance of Al/ZnO/ITO Schottky diode.

The design of an energy-harvesting unit with superior output characteristics, i.e., high power density, is a great technological challenge in the present time. Here, simple, lightweight, flexible, and cost-effective piezoelectric nanogenerators (PENGs) have been fabricated by integrating the aluminum electrodes onto Er/Fe stimulated electroactive, visible-light-emitting, and large dielectric PVDF films in which ErCl·6HO and Fe(NO)·9HO act as the catalytic agents for electroactive β polymorph nucleation and the enhancement of dielectric properties. The developed PENGs exhibit excellent energy-harvesting performance with very high power density and very fast charging ability compared with the previously reported PVDF-assisted prototype nanogenerators. The PENGs lead to very large power density (∼160 and ∼55.34 mW cm) under periodic finger imparting for Er- and Fe-stimulated PVDF-film-based energy-harvester units, respectively. The fabricated self-powered PENG is also able to light up 54 commercially available light-emitting diodes.

A simple, cost-effective and environment-friendly biowaste crab shell-extracted chitin nanofiber-based superior piezoelectric nanogenerator was fabricated in this study.

A novel mixed ligand one-dimensional coordination polymer (1D CP), {[Cd2(adc)2(4-nvp)6]·(MeOH)·(H2O)} n (1; H2adc = 9,10-anthracenedicarboxylic acid, and 4-nvp = 4-(1-naphthylvinyl)­pyridine), has been synthesized and structurally characterized by single crystal X-ray crystallography. The 1D polymer undergoes supramolecular aggregation via hydrogen bonding, C–H···π, and π···π interactions. Interestingly, compound 1 shows increasing conductivity upon irradiation of light. Therefore, it has the potential to be used in optoelectronic devices. Moreover, the supramolecular assembly of 1 specifically detects Cr3+ cation in the presence of other competitive analytes. Most importantly, compound 1 exhibits fascinating turn-on Cr3+ sensing, which seems to be an ornament in the field of sensing application.