Abstract
Graphdiyne (GDY) is an emerging carbon allotrope consisting of sp- and sp2-hybrid carbon atoms. The sp-hybrid carbon–carbon triple bond structure with strong d–π interaction has endowed GDY special nonlinear absorption (NLA) properties, which is different from graphene. As a starting monomer for synthesizing GDY, hexakis[(trimethylsilyl)ethynyl]benzene (HEB-TMS) also owns the carbon–carbon triple bond (sp-) and the benzene ring (sp2-) structures (similar to GDY), which stimulates us to explore the NLA properties of HEB-TMS. In this work, two-dimensional (2D) nanosheets of HEB-TMS are successfully prepared using a liquid-phase exfoliation method with the thicknesses of 3.49 ~ 4.47 nm. And the broadband NLA properties are researched using an open-aperture Z-scan method (from ultraviolet to infrared waveband). The results demonstrate that HEB-TMS owns excellent NLA characteristics in visible light waveband. The excellent optical limiting properties of HEB-TMS provide the possibility of application in the protection of human eyes and precision optical component in visible light.
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