Preparation of high purity carbon nanospheres by the chemical reaction of calcium carbide and oxalic acid

The chemical reaction between calcium carbide and oxalic acid has been used to produce high quality carbon nanospheres (CNSs) at the temperature as low as 65 °C without any catalysts. The synthesized CNSs have high purity (>95%), high carbon content (98%) and very uniform size (80–100 nm).