Article Dans Une Revue Optics Communications Année : 2025

Ferroelectric-to-paraelectric phase transition probing via high-resolution tip-enhanced Raman spectroscopy

Résumé

Understanding the size-dependent phase transition in ferroelectric materials is essential for their integration into nanoscale electronic and energy-storage or -conversion applications. In this study, we utilize high-resolution tip-enhanced Raman spectroscopy (TERS) to investigate phase transitions in individual barium titanate (BaTiO3) nanoparticles with diameters of approximately 20 nm and 40 nm close to the superparaelectric limit. Mapping localized surface plasmon resonance (LSPR) shifts and Raman vibrational modes, we identify a transition from ferroelectric to paraelectric phase in individual nanoparticles. The Raman peaks at 306 cm−1 and 720 cm−1, characteristic of tetragonality in BaTiO3, show significant intensity reduction in an 18 nm nanoparticle, indicating a suppression of ferroelectricity due to finite-size effects. LSPR mapping reveals a red-shift of approximately 7 nm, corresponding to a refractive index change of ∼0.11, consistent with the bulk ferroelectric-to-paraelectric transition. Near-field imaging further confirms a core–shell structure, where the core retains ferroelectricity while the shell transitions to the paraelectric phase. These insights provide a deeper understanding of size-dependent ferroelectricity and offer a promising approach for advancing ferroelectric nanodevices.

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Dates et versions

hal-05111959 , version 1 (13-06-2025)

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Mohammad Bakhtbidar, Alexandre Merlen, Andreas Ruediger. Ferroelectric-to-paraelectric phase transition probing via high-resolution tip-enhanced Raman spectroscopy. Optics Communications, 2025, 591, pp.132058. ⟨10.1016/j.optcom.2025.132058⟩. ⟨hal-05111959⟩

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