Designing LiDAR-Detectable Dark-Tone Materials with High Near-Infrared Reflectivity for Autonomous Driving: A Comprehensive Review

초록

Autonomous driving relies on the precise recognition of objects using light detection and ranging (LiDAR) technology, that operates at a specific wavelength of 905 nm. Black objects, such as carbon black used in vehicle coating, tend to absorb this specific wavelength significantly, which limits the performance of LiDAR sensors. To address this issue, researchers have explored creating dark-toned materials that can be detected by LiDAR with high NIR reflectivity while maintaining a true blackness (L* < 20 based on the CIE color coordinates). These materials fall into two categories: organic and inorganic pigments. Organic pigments can be synthetically adjusted to achieve true blackness by manipulating their functional groups, but achieving high NIR reflectivity remains challenging, often requiring a bilayer structure with NIR-reflective white base and an upper layer of organic black pigments. Additionally, the need for hydrophobic additives and resistance to degradation from sunlight further restricts their use. In the case of inorganic pigments, the desired LiDAR-detectable properties can be obtained through careful control of their composition, structure, and morphology, allowing for single-layer coatings with appropriate design. This review highlights recent advancements in developing organic and inorganic LiDAR-detectable black pigments and outlines future material design strategies for autonomous vehicle systems. © 2024 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH.

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