Self-Charging, Breathable, and Antibacterial Poly(lactic acid) Nanofibrous Air Filters by Surface Engineering of Ultrasmall Electroactive Nanohybrids

作者：Chenyu Liang, Jiaqi Li, Yuyang Chen, Lv Ke, Jintuo Zhu, Lina Zheng, Xiaopeng Li, Shenghui Zhang, Heguo Li, Gan‐Ji Zhong, Huan Xu · 发表于：ACS Applied Materials & Interfaces · 年份：2023 · DOI：10.1021/acsami.3c13825 · 被引用次数：40 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Electrospun Nanofibers in Biomedical Applications、Surface Modification and Superhydrophobicity

Despite the great promise in the development of biodegradable and ecofriendly air filters by electrospinning of poly(lactic acid) (PLA) nanofibrous membranes (NFMs), the as-electrospun PLA nanofibers are generally characterized by poor electroactivity and smooth surface, challenging the exploitation of electrostatic adsorption and physical interception that are in need for efficient removal of pathogens and particulate matters (PMs). Herein, a combined “electrospinning–electrospray” strategy was disclosed to functionalize the PLA nanofibers by direct anchoring of highly dielectric BaTiO 3 @ZIF-8 nanohybrids (BTO@ZIF-8), conferring simultaneous promotion of surface roughness, electret properties (surface potential as high as 7.5 kV), and self-charging capability (∼190% increase in tribo-output voltage compared to that of pure PLA). Benefiting from the well-tailored morphology and increased electroactivity, the electrospun–electrosprayed PLA/BTO@ZIF-8 exhibited excellent PM-capturing performance (up to 96.54% for PM 0.3 and 99.49% for PM 2.5 ) while providing desirable air resistance (only 87 Pa at 32 L/min) due primarily to the slip flow of air molecules over the nanohybrid protrusions. This was accompanied by excellent antibacterial properties (99.9% inhibition against both Staphylococcus aureus and Escherichia coli ), arising presumably from the synergistic effects of enhanced reactive oxygen species (ROS) generation, plentiful ion release, and surface charges. Our proposed ...