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Integration of Interfacial Chemistry-Guided BaTiO3 Nanoparticle Arrangements in Polymer Film Stacks for
Wenkun Lv1, Yufan Weng2, Yumeng Wang3,4
1Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China.
Abstract:
Precise spatial arrangement of nanoparticles (NPs) within soft polymer matrices is essential for enabling hierarchical architectures with tailored dielectric and piezoelectric properties. However, constructing well-ordered, multilayered NP structures remains challenging due to interfacial aggregation, solvent-driven instabilities, and poor layer-to-layer registration. Here, we report a solvent-mediated confinement assembly approach that utilizes patterned polymer templates to direct the assembly of barium titanate (BaTiO3) nanoparticles in a poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] matrix. By controlling interfacial wettability, solvent evaporation, and polymer-nanoparticle interactions, we achieve highly ordered nanoparticle arrays with a feature size of 1 μm and an integration density of 2000 lines/cm. Multilayered architectures are further constructed via layer-by-layer (LbL) assembly, demonstrating enhanced dielectric energy storage (4.8 J/cm3) and piezoelectric sensing (2 mg detection limit). This work provides a generalizable approach for manipulating nanoparticle assemblies in soft matter, with potential applications in flexible electronics and energy devices.
