Engineering Sciences and Technology - Publications

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Browsing Engineering Sciences and Technology - Publications by Author "Acharyya, Swati G."
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    One-step synthesis of bulk quantities of graphene from graphite by femtosecond laser ablation under ambient conditions
    ( 2017-06-03) Kiran, Gadde R. ; Chandu, B. ; Acharyya, Swati G. ; Rao, S. Venugopal ; Srikanth, Vadali V.S.S.
    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.
  • Item
    One-step synthesis of bulk quantities of graphene from graphite by femtosecond laser ablation under ambient conditions
    ( 2017-06-03) Kiran, Gadde R. ; Chandu, B. ; Acharyya, Swati G. ; Rao, S. Venugopal ; Srikanth, Vadali V.S.S.
    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.