Abstract
The preparation and modulation of bare nano-diamonds (NDs) are of great significant for further investigation into their intrinsic structures, exploring more underlying properties, unlocking latent performances and exploiting more extensive applications. In this study, bare NDs have been successfully synthesized and modulated through 343nm femtosecond laser ablation in liquids (LAL). When laser scanning point interval (LSPI) was reduced from 4 μm to 0.5 μm, the average size of NDs decreased from 4.1nm to 3nm. While it remained around 3.2nm for NDs obtained at different energies. Notable, sp3-C within NDs accounted for above 71% at laser energy of diamond damage threshold (118mW), and then transformed into sp2-C as laser energy increased. NDs prepared in water and ethanol differed in terms of their size distribution, intrinsic structure, and surface state. NDs@ethanol sized 3.8nm exhibited higher sp3/sp2 ratio and more complex surface states than NDs@water sized 3.3nm. These findings not only can provide valuable guidance for precise regulation of NDs preparation, but also can offer diverse structural NDs for exploring their potential applications.
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