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[9a-Z21-5] Synthesis of Metal/carbon Nanocomposite by Gas/liquid Discharge Plasma
under High Pressure
Keywords:pulsed arc discharged plasma, metal/carbon nanocomposite, amorphous carbon
In the present work, metal-based nanoparticles (NPs) encapsulated by the carbon nanosheets were synthesized through a one-step method by pulsed arc discharge plasma over the Ar/water interface under high pressure. The carbon nanosheets are formed from glycine dissolved in the water phase, which is an abundant, cheap, and environmental-friendly carbon precursor while metal-based NPs are generated instantaneously from metal electrodes. The experiments were conducted in the 100 g/L glycine solution at room temperature with the pressurized Ar gas at 0-4.0 MPa, the high-voltage of 18.6 kV supplied by DC pulsed power In the experiment, Ag, Ti, and Fe, three kinds of metal rods have been used as the anode to fabricate metal/carbon nanocomposites.
The HRTEM coupled with SAED (shown as the Fig.1) indicated that Ag, TiO2, and Fe3O4 NPs successfully produced in uniform size around 10 nm are decorated on the amorphous carbon nanosheets. The effects of plasma parameters on the size distribution of the metal-based NPs have been studied by adjusting the Ar gas pressure, pulse frequency, and solution conductivity. With the increased gas pressure and the pulse frequency, the size of the metal-based NPs decreased. However, the solution conductivity showed no effect of the metal-based NPs.
The HRTEM coupled with SAED (shown as the Fig.1) indicated that Ag, TiO2, and Fe3O4 NPs successfully produced in uniform size around 10 nm are decorated on the amorphous carbon nanosheets. The effects of plasma parameters on the size distribution of the metal-based NPs have been studied by adjusting the Ar gas pressure, pulse frequency, and solution conductivity. With the increased gas pressure and the pulse frequency, the size of the metal-based NPs decreased. However, the solution conductivity showed no effect of the metal-based NPs.