Exploring pore structures that are optically transparent and have high filtration efficiency for ultrafine dust is very important for realizing passive window filters for indoor air purification. Herein, a polyester track-etched (PETE) membrane with vertically perforated micropores is investigated as a cost-effective candidate for transparent window filters. The pore size, which governs transparency and filtration efficiency, can be precisely tuned by conformally depositing an ultrathin oxide layer on the PETE membrane via atomic layer deposition. The maximum visible light transmittance (∼81.2 %) was achieved with an alumina layer of approximately 55 nm, and the resulting composite membrane exhibited competitive filtration efficiency compared to commercial products. The chemically inert alumina layer also increased resistance to various external stimuli and enabled simple cleaning of the contaminated membrane surface with a solvent. The membrane installed on an insect screen effectively maintained its filtration performance (∼85 % for PM_2.5) even after 10 reuse cycles under extremely harsh conditions (PM_2.5 concentration: ∼5000 μg cm⁻³). The proposed through-hole composite membrane can expand the choice of aesthetic window filters to situations that require high outside visibility and daylighting.

探索光学透明且对超细粉尘具有高过滤效率的孔结构对于实现用于室内空气净化的被动窗过滤器非常重要。在此，研究了具有垂直穿孔微孔的聚酯径迹蚀刻 (PETE) 膜作为透明窗口过滤器的具有成本效益的候选者。控制透明度和过滤效率的孔径可以通过原子层沉积在 PETE 膜上共形沉积超薄氧化物层来精确调整。约 55 nm 的氧化铝层实现了最大可见光透射率 (~81.2%)，与商业产品相比，所得复合膜表现出具有竞争力的过滤效率。化学惰性的氧化铝层还增加了对各种外部刺激的抵抗力，并能够用溶剂简单地清洁受污染的膜表面。安装在防虫网上的膜有效地保持了其过滤性能（PM 约 85%_2.5 ) 即使在极其恶劣的条件下（PM _2.5浓度：~5000 μg cm ^-3）经过 10 次重复使用循环后。所提出的通孔复合膜可以将美观的窗户过滤器的选择范围扩大到需要高外部能见度和采光的情况。