Hollow-Structured Plate TiO2 Material as an NIR-Reflective Pigment for Future Autonomous Vehicle

초록

A hollow-structured, plate-shaped black TiO2 (P-HBT) pigment is developed as a near-infrared (NIR)-reflective black material for autonomous vehicle applications. A white TiO2 layer is first deposited onto a glass substrate via the sol-gel method to form a plate-like shell, followed by hydrofluoric acid etching to remove the glass core and NaBH4 reduction to convert it into black TiO2. The resulting P-HBT with a shell thickness of 150?nm (P-HBT2) exhibits true blackness (L*?=?13.2) and a high NIR reflectance of 23.5% at 905?nm, attributed to the optimized shell thickness and hollow structure. In practical application, P-HBT2 demonstrates excellent mechanical durability and spreadability compared to sphere-shaped hollow black TiO2. Conclusively, this study presents a novel approach for designing inorganic black pigment for LiDAR applications. -본 연구는 2025년도 산업통상자원부 및 산업기술기획평가원(KEIT) 연구비 지원에 의한 연구임(RS-2022-00156073). Keywords: Hollow black TiO2, NIR reflectance, LiDAR, Plate-shaped, Autonomous vehicle