새글 논문 해외 국제전문학술지(SCI급) (공동) Scalable Hierarchical Porous Alumina for Tunable Broadband Absorbers via Carbon Nanofibers
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2026-11
- 저자명 Chu Duc Thanh, Geun Tak Yuk, Seung-Ho Lee, Jang Huyn Kyung, Jeong-Chul Kim, Chang-Min Yoon, Jeoung Han Kim, Hongseok Youn, Yong Son, Thuy-Kieu Truon*, and Jinsung Rho*
- 학술지명 Advanced Optical Materials
- 발행처명 Wiley
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 11
홈페이지논문 초록 (Abstract)
Aluminum-based blackbodies with ultrabroadband absorption remain challenging due to limited durability, poor conformal coverage, and limited emissivity tunability of conventional surface treatments. Here, we report a 3D Al2O3 architecture exhibiting record broadband absorption exceeding 92% over 0.3–15 μm. The architecture is fabricated by hard anodization of a copper-rich Al2139 alloy produced by laser powder bed fusion, where selective dissolution of Cu-rich phases generates a disordered mesoporous Al2O3 scaffold. The hierarchical porous morphology provides a graded refractive-index transition and multiple scattering for photon trapping, with nickel deposition further boosting absorption to 94%. Subsequent carbon nanofiber (CNF) coating produces an ultra-black surface with a band-averaged reflectance of 0.28% in the ultraviolet–near-infrared (0.3–2.5 μm) and 0.45% in the mid-infrared (2.5–15 μm). Controlling layer thicknesses enables tuning infrared emissivity from ∼20% to 99%, offering a solution for harsh environments, solar–thermal systems, blackbody absorbers, and stray-light suppression coatings.