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<p>Transparent near-infrared (NIR) shielding materials are crucial for optoelectronic devices and smart windows, but there is often a trade-off between high visible transparency and efficient NIR blocking for conventional materials. In this work, antimony-doped tin oxide (ATO) nanocrystals were successfully prepared via a coprecipitation–hydrothermal method, and the effects of the Sb doping level on the crystal structure, valence state, particle size, and optical properties of ATO nanocrystals were investigated. The X-ray photoelectron spectroscopy results confirm that 15&#xa0;mol% Sb-doped ATO exhibits the highest Sb<sup>5+</sup>/Sb<sup>3+</sup> ratio, which enhances the free carrier concentration and induces the strongest localized surface plasmon resonance (LSPR) effect and optimal NIR absorption. Then, the as-prepared ATO nanocrystals were incorporated into poly(ethylene terephthalate) (PET) to fabricate transparent composite films. The optimized film shows a visible-light transmittance above 80% and a solar-weighted NIR-shielding rate above 60%. A maximum temperature difference of 4&#xa0;°C is achieved compared with pure PET. The tensile strength of the film with 1.4 wt% of ATO reaches 50.3&#xa0;MPa, which is 17% higher than that of neat PET. This work provides a feasible strategy for preparing high-performance LSPR-tunable transparent conductive oxide (TCO)/polymer composite films with promising applications in optoelectronic films, smart windows, and energy-saving electronic devices.</p>

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Antimony-doped tin oxide nanocrystals with tailored LSPR effect for high-performance transparent near-infrared shielding PET composite films

  • 期刊论文

  • 发表日期：

    2026年6月14日

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  • Zhihui Sun,
  • Shiai Xu

摘要

Transparent near-infrared (NIR) shielding materials are crucial for optoelectronic devices and smart windows, but there is often a trade-off between high visible transparency and efficient NIR blocking for conventional materials. In this work, antimony-doped tin oxide (ATO) nanocrystals were successfully prepared via a coprecipitation–hydrothermal method, and the effects of the Sb doping level on the crystal structure, valence state, particle size, and optical properties of ATO nanocrystals were investigated. The X-ray photoelectron spectroscopy results confirm that 15 mol% Sb-doped ATO exhibits the highest Sb5+/Sb3+ ratio, which enhances the free carrier concentration and induces the strongest localized surface plasmon resonance (LSPR) effect and optimal NIR absorption. Then, the as-prepared ATO nanocrystals were incorporated into poly(ethylene terephthalate) (PET) to fabricate transparent composite films. The optimized film shows a visible-light transmittance above 80% and a solar-weighted NIR-shielding rate above 60%. A maximum temperature difference of 4 °C is achieved compared with pure PET. The tensile strength of the film with 1.4 wt% of ATO reaches 50.3 MPa, which is 17% higher than that of neat PET. This work provides a feasible strategy for preparing high-performance LSPR-tunable transparent conductive oxide (TCO)/polymer composite films with promising applications in optoelectronic films, smart windows, and energy-saving electronic devices.