Xiujuan Lin

Digital light processing (DLP) presents a promising approach for fabricating intricately designed piezoelectric components, which are essential for developing high‐sensitivity piezoelectric sensor systems. However, the inherent layer‐by‐layer stacking nature of DLP induces interlayer cracking in printed ceramics, which severely deteriorates their performance. This work introduces an innovative interfacial engineering strategy to print superlattice components with exceptional piezoelectric performance. A moderate exposure time improves the surface characteristics of cured layers, that initiates controlled secondary curing at material interfaces. This process strengthens interlayer bonding and consequently boosts the mechanical properties of the green body. The optimal interlayer bonding quality is observed for t‐20 ceramics. Its piezoelectric constant ( d ₃₃ ) reaches an exciting 516 ± 8 pC·N ⁻¹ , which approaches the level of commercial ceramic and exceeds the values of most 3D‐printed advanced piezoelectric materials. The printed superlattice component achieves an ultra‐high piezoelectric response, e.g., open‐circuit voltage up to 493 V at 17.3 N. The component exhibits an extremely pressure‐sensitive sensitivity of 27.9 V·N ⁻¹ , along with a voltage response at a very faint load of 0.1 N. Applications in various scenarios show the component's favorable sensing characteristics and reliable non‐contact dynamic monitoring capability, which opens new avenues for its applications in the sensing field.

To date, lead‐based piezoelectric ceramics continue to be extensively utilized and studied as essential functional materials in various electromechanical applications. Achieving a combination of high piezoelectric coefficients, excellent mechanical quality factors, and thermal stability is critical for resonant piezoelectric systems, yet advancements in optimizing these properties remain a significant challenge. Here, defect engineering based on chemical composition modulation was used to prepare lead‐based 0.06Pb(Ni _1/3 Nb _2/3 )O ₃ ‒0.94[0.05Pb(Mn _1/3 Sb _2/3 )‒0.95Pb(Zr _0.48 Ti _0.52 )O ₃ ] ceramics, overcoming the performance‐limiting negative correlation. This led to an enhancement in piezoelectric performance ( d ₃₃ = 462 pC/N, Q _m = 1717) without significant sacrifice of mechanical quality factor, along with low loss (tan δ = 0.24%) and high Curie temperature ( T _c = 322°C). The advanced piezoelectric temperature stability is confirmed by a d ₃₃ value variation of only 2.17% as the temperature increased from 25°C to 200°C, surpassing many advanced commercial lead‐based materials (PZT‐5A). This work demonstrates significant progress in the comprehensive performance and temperature stability of lead‐based piezoelectric ceramics, achieving a well‐balanced performance and stimulating further efforts toward high‐temperature piezoelectric applications.

The high-temperature flexible composite film consists of BS–PT–SBT piezoelectric ceramic particles and PI matrix. It shows a high sensitivity of 6.56 V N⁻¹, and can further serve as a functional component in multi-scenario sensing applications.

The flexible piezoelectric pressure sensor is essential in areas such as machine sensing and human activity monitoring. Here, 0-dimensional PZT piezoelectric ceramic nanoparticles with carbon coating were synthesized by a surface-modified technique. The excellent electrical conductivity of the carbon shell causes redistribution and accumulation of mobile charges in the carbon layer, resulting in a greatly increased piezoelectric effect by inducing an enhanced electric field. A series of organic–inorganic composite films were prepared by the spin-coating method using polydimethylsiloxane (PDMS) as the matrix. The as-fabricated flexible PZT@C/PDMS composite film with 40 wt% PZT@C powder exhibits an excellent output voltage of ~74 V, a peak of output current ~295 nA, as well as a big sensitivity of 5.26 V N⁻¹. Moreover, the composite film can be used as a pressure sensor to detect changes in force as well as for monitoring limb movements such as finger flexion, wrist flexion, and pedaling. This study reveals the promising applications of flexible 40%PZT@C/PDMS composite film for limb motion monitoring and pressure sensing.

BiFeO₃ (BFO), Mn-doped-BFO (BFMO), Ti-doped-BFO (BFTO), and (Mn,Ti)-codoped-BFO (BFMTO) thin films are fabricated on the Pt/TiO₂/SiO₂/Si substrates via a sol–gel method combined with spin-coating and the subsequent layer-by-layer annealing technique. Compared with BFO film, the BFMTO film exhibits the lowest leakage current density ([ ][ ]A/cm²@290[ ]kV/cm). Notably, the polarization–electric field (P–E) loop of BFMTO film exhibits a positive displacement along the x-axis due to the existence of internal bias electric field, which is in agreement with the results of the PFM phase and amplitude curves. Especially, a very prominent inverse piezoelectric constant of [ ][ ]pm/V was obtained, which overcomes other related thin films. The internal bias electric field of BFMTO film can be caused by the different work functions of the thin film and the bottom electrode, accumulation of oxygen vacancies and the formation of defect dipoles. Besides, the internal bias electric field of BFMTO film has a good stability at the same electric field after experiencing the test cycle from low electric field to high electric field (400–1900[ ]kV/cm). These results indicate that self-polarized BFMTO film can be integrated to devices without additional polarization process, and have a wide range of application in microelectromechanical systems.