The search for sustainable and efficient energy conversion technologies is becoming increasingly critical in response to global energy and environmental challenges. Traditional lead-based piezoelectric materials, such as lead zirconate titanate (PZT), have high piezoelectric constant but present significant health problems and environmental risks due to their hazardous metal contaminants. This study addresses these concerns by investigating barium titanate (BTO), a lead-free alternative, and enhancing its performance using anisotropic nanowires (NWs) structures. BTO NWs were synthesized via a two-step hydrothermal method and incorporated into a poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] matrix to fabricate a piezoelectric composite film. The resulting device demonstrated a notable increase in electrical output compared to devices based on isotropic morphology of BTO nanoparticles, exhibiting enhanced performance. These findings suggest that BTO NWs hold significant promise for applications in flexible and wearable electronics, paving the way for further advancements in sustainable energy technology.

Citations

• Interphase engineering in carbon black–reinforced piezoelectric nanocomposites: A combined experimental and micromechanical modeling study
  Ziwen Zhao, Masoumeh Khamehchi, Mohammad J. Mahmoodi, Zhenjin Wang, Fumio Narita
  Materials & Design.2026; 268: 116391.     CrossRef
• MXene-reinforced ultrasensitive piezoelectric pressure sensors based on P(VDF-TrFE) nanofibers with hybrid nanofillers
  Jingyi Yang, Jianqiao Wang, Zike Guo, Shuai Liu, Yaohua Dong, Peng Zhou, Tianjin Zhang, Yajun Qi
  Journal of Alloys and Compounds.2026; 1079: 189867.     CrossRef
• Layer-engineered BNBT–polymer films for multifunctional applications
  M. Vijatovic Petrovic, A. Dzunuzovic, J. Bobic, Z. Despotovic, F. Cordero, E. Mercadelli, Z. Radovanovic, F. Craciun
  Journal of Alloys and Compounds.2026; 1079: 189972.     CrossRef
• Piezoionic sensor devices of integrated gradient electrolyte gels
  Yi Fang, Hongbing Li, Taeuk Eom, Chang Kyu Jeong, Yong Zhang
  Chemical Engineering Journal.2026; 540: 177542.     CrossRef
• Interfacial polarization triggered by low-k fillers boosts piezoelectricity of MMT/PT composites for intelligent health monitoring
  Yong Ao, Junjun Yuan, Wenqi Yu, Rui Yuan, Boling Lan, Shenglong Wang, Tingting Zhou, Guicen Liu, Wei Zhao, Zhiyuan Gao, Xiaofei Jiang, Weili Deng, Long Jin, Weiqing Yang
  Journal of Materials Chemistry A.2026;[Epub]     CrossRef
• Interfacial Engineering of Composite Piezoelectric Fibers Via an Anchor-Chain Architecture
  Jun Liu, Qiao Zhou, Pengcheng Zhang, Shuying Hu, Fang Zhou, Shuangshuang Ren, Ting Guo, Leiying Miao
  ACS Applied Engineering Materials.2026; 4(8): 4367.     CrossRef

The Hall factor in a two-dimensional device with indirect conduction valleys is calculated for several growth on various strain conditions. In the [001] or [111] growth direction, the two-dimensional constant energy surfaces of occupied valleys are shown to be isotropic ally distributed. However, in the [110] growth direction, the distribution of occupied valleys on the plane is not isotropic. This fact is the reason for the anisotropic Hall factor on the sample plane.