Synthesis of LiDAR-reflective Black Materials and Upcycling of Residues

초록

In this study, LiDAR-reflective materials were synthesized as hollow-structured black TiO2 nanospheres (BHTNs). During the synthesis process, SiO2 residues were generated in solution form. Thereby, we have designed upcycling strategy of SiO2 residues in semiconductor application. BHTNs are synthesized by sol?gel coating of TiO2 on SiO2 templates, followed by NaBH4 reduction and selective ammonia etching to form hollow structures. The resulting BHTNs manifested highly black color (L* = 13.6) and NIR reflectance (ca. 30.8% at 905 nm) characteristics, allowing clear detection by a LiDAR sensor. Furthermore, SiO2 residues are re-synthesized into uniform SiO2 nanospheres and employed as filler for epoxy molding compound used in semiconductor packaging process. Accordingly, this study successfully demonstrates the dual synthesis and upcycling routes for next-generation materials. - 본 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (RS-2025-16070620).? Keywords: Upcycling, LiDAR-reflective, Epoxy molding compound, Residue, Dual strategy