This product is an unprecedented C₃N₄ polymer-synthesis-based semiconductor material with composite photocatalyst properties. It offers affordability, flexibility, and lightweight design while delivering long-term performance with minimal environmental burden through the application of flexible photocatalytic materials. Unlike conventional solid-state forms, it embodies polymer-synthesized photocatalyst features in flexible devices and thin-film lightweight structures, functioning as a filterless air sterilizer and deodorizer. Overcoming the limitations of filter-based purifiers, the device sterilizes more than 99% of airborne bacteria and viruses and removes more than 70% of elderly body odors and harmful gases. The IoT-based smart sensor operates with low power consumption and low noise, responding in real time to air quality. As a compact, maintenance-friendly unit, it is optimized for high-risk environments such as hospitals, nursing homes, and public institutions, ensuring indoor hygiene and respiratory health.