Flexible inorganic piezoelectric functional films and their applications

Abstract

Piezoelectric materials play an increasingly important role in energy harvesters, sensors, and actuators. Flexible and thin piezoelectric films have been demonstrated to provide advanced functionalities and improved performances. However, the research on flexible inorganic piezoelectric thin films has rarely been systematically summarized. Here, we summarize the recent advances in the flexible inorganic piezoelectric thin films, focusing on their structural designs, fabrication techniques, and applications in various practical scenarios. Specifically, different fabrication techniques suitable for diverse inorganic piezoelectric nanostructures are reviewed, including sol-gel, hydrothermal, electrospinning, and other techniques, and the integration process with flexible substrates is further discussed. Biomedical and industrial applications of the flexible piezoelectric thin films are emphasized. Finally, some existing challenges and future perspectives are discussed.

Piezoelectric dressings for advanced wound healing

“…173 Piezoelectric ceramics mainly have perovskite or wurtzite structures, such as PZT, BaTiO 3 , (Bi, Na)TiO 3 (BNT), (K, Na)NbO 3 (KNN), etc. 171,172,174,175 Although PZT materials have high piezoelectric properties, they should be avoided in the biomedical field due to the potential toxicity of Pb. 176,177 BTO is one of the earliest discovered piezoelectric materials.…”

Piezoelectric Energy Harvester Technologies: Synthesis, Mechanisms, and Multifunctional Applications

“…By implementing energy harvesting to power wireless technologies, large-scale energy demand can be reduced, in particular for battery charging, and new applications such as the IoT can be enabled by locally harvesting power through energy harvesting. Thus, considerable effort has been devoted to the development of energy harvesting devices, encompassing piezoelectric, triboelectric, thermoelectric, and solar cell technologies, all of which find applications across various scenarios. − As summarized in Table , piezoelectric and triboelectric devices demonstrate promising potential for converting ambient mechanical movement into electricity, unaffected by weather conditions and heat dissipation limitations, ,, while thermoelectric devices offer the opportunity to make use of waste heat sources, and solar cell can potentially provide higher power levels, but which are dependent on ambient or solar light sources. Therefore, exploring the optimum application scenarios could lead to better-designed devices for specific purposes.…”

A Review of Flexible Acceleration Sensors Based on Piezoelectric Materials: Performance Characterization, Parametric Analysis, Frontier Technologies, and Applications

“…Ceramic/polymer composites were first proposed in 1978, in which electrical properties have been greatly improved and are expected to exhibit some new properties [79,80]. Inorganic materials in the material will be very sensitive to applied forces due to high voltage [81,82]. In addition, due to the high elasticity of the elastic matrix in the composite, they also have good shape preservation and flexibility.…”