抄録
Nanographenes are synthesized from alcohols by in-liquid plasma with ultrahigh rate. When carbon number in an alcohol molecule is high, synthesis rates increase but the crystalline nature of nanographene decreases. To eliminate trade-off between synthesis rates and crystal nature of nanographenes, ultrasound was irradiated to alcohols under in-liquid plasma. Samples were ethanol, 2-propanol, and 1-hexanol. Ultrasonic frequency was 500 kHz and power was 7.5 W. After nanographene synthesis, suspended solids were filtered using 0.45-μm-pore-size filters and treated with 30% hydrogen peroxide solution. Treated nanographene was analyzed by Raman scattering spectroscopy. Sample color was changed from transparent to black by in-liquid plasma and black area spread under ultrasound. The synthesis rate for all alcohol increased by ultrasound. In the case of 1-hexanol, crystal nature of nanographene was improved due to ultrasonic cavitation.
