Wood-based superblack

Bin Zhao, Xuetong Shi, Sergei Khakalo, Yang Meng, Arttu Miettinen, Tuomas Turpeinen, Shuyi Mi, Zhipei Sun, Alexey Khakalo, Orlando J. Rojas () and Bruno D. Mattos ()
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Bin Zhao: Aalto University
Xuetong Shi: The University of British Columbia
Sergei Khakalo: School of Engineering, Aalto University
Yang Meng: Kunming University of Science and Technology
Arttu Miettinen: University of Jyvaskyla
Tuomas Turpeinen: VTT Technical Research Centre of Finland Ltd
Shuyi Mi: Aalto University
Zhipei Sun: Aalto University
Alexey Khakalo: VTT Technical Research Centre of Finland Ltd
Orlando J. Rojas: Aalto University
Bruno D. Mattos: Aalto University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Light is a powerful and sustainable resource, but it can be detrimental to the performance and longevity of optical devices. Materials with near-zero light reflectance, i.e. superblack materials, are sought to improve the performance of several light-centered technologies. Here we report a simple top-down strategy, guided by computational methods, to develop robust superblack materials following metal-free wood delignification and carbonization (1500 °C). Subwavelength severed cells evolve under shrinkage stresses, yielding vertically aligned carbon microfiber arrays with a thickness of ~100 µm and light reflectance as low as 0.36% and independent of the incidence angle. The formation of such structures is rationalized based on delignification method, lignin content, carbonization temperature and wood density. Moreover, our measurements indicate a laser beam reflectivity lower than commercial light stoppers in current use. Overall, the wood-based superblack material is introduced as a mechanically robust surrogate for microfabricated carbon nanotube arrays.

Date: 2023
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DOI: 10.1038/s41467-023-43594-4

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