Humidity-Controllable, High-Throughput, and Portable Nanofibrous Filter Coating System for Improving Air Quality

Industrialization around the globe has rapidly increased fine dust concentration in the air, deteriorating the air quality. Deteriorated air quality greatly affects human health, causing diseases, such as respiratory and heart diseases. Thus, nanofibrous air filters with high dust removal efficiency and light transmittance on window screens have been investigated. However, nanofiber deformation due to external conditions and low nanofiber production of conventional electrospinning systems bottleneck their practical applications. In this study, we report a humidity-controllable, high-throughput, patternable, repairable, and portable electrospinning-based filter coating system. The fabricated nanofibrous filter had a high dust removal efficiency (>90%), high transparency (>80%), and low pressure drop (<60 Pa). Moreover, we fabricated nanofibrous fibers in a humid environment by adjusting the relative humidity (45–71%) and patterned and repaired the nanofibrous dust filter. The proposed filter coating method offered excellent performance in the actual outdoor environment.