One-step synthesis of bulk quantities of graphene from graphite by femtosecond laser ablation under ambient conditions |
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Authors: | Gadde R Kiran B Chandu S Venugopal Rao Vadali V S S Srikanth |
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Institution: | 1. School of Engineering Sciences and Technology (SEST), University of Hyderabad, Hyderabad, India;2. Advanced Centre of Research in High Energy Materials (ACHREM), University of Hyderabad, Hyderabad, India |
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Abstract: | Bulk synthesis of few-layer graphene (FLG) for industrial applications still remains a challenge for researchers. Here, we report a very simple technique for bulk synthesis of FLG by femtosecond laser ablation of graphite powder suspended in ethanol without the requirement of a controlled environment. Graphite powder, with an average particle size <20 μm, was suspended uniformly in ethanol and ablated at room temperature using fs pulses (wavelength ~800 nm and an input beam diameter ~8 mm) followed by ultrasonication to obtain FLG with a lateral size of ~1 μm. Raman spectroscopy and high-resolution transmission electron microscopy data confirmed the nature and morphology of the FLG. The quality and number of layers in the FLG could be controlled by tuning the laser parameters. |
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Keywords: | Carbon materials few-layer graphene surfaces laser ablation ultrasonication Raman spectroscopy HRTEM |
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