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Boosting Photo-Pyroelectric Effect via Tunable Polarization and Interfacial Defect Engineering.

Yanli Huang¹, Haifen Luo¹, Jie Yin²

¹Key Laboratory of Opto-Electronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, Fujian Key Laboratory of Flexible Electronics, Strait Institute of Flexible Electronics (SIFE, Future Technologies), College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou, China.

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Summary

This summary is machine-generated.

Researchers developed enhanced pyroelectric nanocatalysts for cancer therapy. These catalysts efficiently generate reactive oxygen species (ROS) under near-infrared light, leading to effective tumor cell destruction in preclinical studies.

Keywords:

barium titanate interfacial defects photo‐pyroelectric effect reactive oxygen species tumor therapy tunable polarization

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Area of Science:

Materials Science
Nanotechnology
Biomedical Engineering

Background:

Pyroelectric catalysis offers potential for energy and medicine but is limited by low pyroelectric coefficients and poor reactive oxygen species (ROS) generation.
Existing pyroelectric materials struggle with insufficient interfacial reactivity, hindering their therapeutic applications.

Purpose of the Study:

To design and synthesize Ba(Ti_0.85Zr_0.15)O₃ (BTZ) nanocatalysts for efficient near-infrared-II (NIR-II) driven photo-pyroelectric cancer therapy.
To enhance pyroelectric coefficients and interfacial reactivity for improved ROS production and tumor ablation.

Main Methods:

Utilized molecular dynamics and phase-field simulations to investigate Zr incorporation effects on polarization.
Employed interface engineering to introduce oxygen vacancies for enhanced NIR-II photothermal conversion and catalytic activity.
Conducted density functional theory (DFT) calculations to understand electronic structure and water adsorption mechanisms.
Performed in vitro and in vivo studies to evaluate therapeutic efficacy.

Main Results:

Achieved an ultrahigh pyroelectric coefficient of 3505 µC m^-2 K^-1 in BTZ nanocatalysts, a 678% enhancement over pristine BaTiO₃.
Demonstrated synergistic pyrocatalysis and peroxidase-like activity under NIR-II irradiation, enabling robust multipath ROS generation.
Confirmed efficient tumor cell ablation in both in vitro and in vivo models via NIR-II induced pyroelectric therapy.

Conclusions:

Co-engineering of polarization and interface design in BTZ nanocatalysts overcomes limitations in pyroelectric catalysis.
The developed material shows significant promise for precision oncology and advanced cancer treatment strategies.
This approach advances the application of pyroelectric catalysis in biomedical fields.