Direct Writing of Patterned, Lead‐Free Nanowire Aligned Flexible Piezoelectric Device

Abstract

A high‐performance flexible piezoelectric nanogenerator (PNG) is fabricated by a direct writing method, which acquires both patterned piezoelectric structure and aligned piezoelectric nanowires simultaneously. The voltage output of the as‐prepared PNG is nearly 400% compared with that of the traditional spin‐coated device due to the effective utilization of stress. This facile printing approach provides an efficient strategy for significant improvement of the piezoresponse.

Comprehensive biocompatibility of nontoxic and high-output flexible energy harvester using lead-free piezoceramic thin film

“…onto flexible plastics, but the output was low since it could not be crystallized (amorphous KNN, a-KNN) below 300 • C. 51 Although Gao et al fabricated a decent-performance flexible nanogenerator using patterned/aligned KNN-elastomer composites, the device was too thick (∼200 µm) to achieve efficient mechanical flexibility and high output density. 52 On the contrary, our AD-formed KNN f-PEH device is strikingly superior to these representative previous reports of flexible lead-free generators. The high performance in this work is even comparable to that of prior high-performance lead-based f-PEHs made by sol-gel PZT films, 11,65 AD-formed PZT thick film, 55 and solid-grown Pb(Mg 1/3 Nb 2/3 )O 3 -PZT (PMN-PZT) thick film 66 with IDEs under similar deformations.…”

“…By contrast, (K,Na)NbO 3 (KNN)-based piezoceramics have attracted attention as replacements for lead-based ceramics because of their large piezoelectricity and high Curie temperature with good doping tunability. [45][46][47][48][49][50][51][52] Nevertheless, the deposition or post-crystallization of KNN-based materials involves difficult processing due to the loss of vaporizable alkaline compositions and slow deposition rates. 53,54 Recently, our group developed a new deposition method, aerosol deposition method (ADM), which is a gas-deposition process that uses as-synthesized particles directly with an accelerated gas to build colloidal aerosol flows.…”

CL‐20 based Explosive Ink of Emulsion Binder System for Direct Ink Writing

“…Direct ink writing (DIW) is a low-cost, high efficiency material forming technology, which has been widely used in ceramic materials [5][6], piezoelectric materials [7], as well as novel functional materials [8] design and preparation fields. In the field of energetic materials, DIW technology has attracted more and more attentions.…”

3D printing of anisotropic polymer nanocomposites with aligned BaTiO3 nanowires for enhanced energy density

“…Three-dimensional printing (3D printing, also known as additive manufacturing) is widely regarded as a revolution in manufacturing technology, with significant promise for electronic applications. [37][38][39] During the printing process, the ceramic/ polymer slurry experiences a high shear environment within the very small nozzle (typically with a diameter of 100 mm), which will produce high orientation of the fillers and form anisotropic materials. 39,40 In addition, 3D printing is a computercontrolled technique, which can print samples with designed geometric shape, precise size, short processing times and at low cost.…”