▎ 摘　　要

A novel physical process to obtain graphene nanoplatelets consisting of two principal steps, steam explosion and ultrasonic exfoliation, is proposed. This approach requires only water; nevertheless, the pressure and temperature conditions in the steam explosion equipment contribute to the delamination of the graphite complemented with an ultrasonic step. Moreover, two kinds of source material were tested: highly pyrolytic oriented graphite and a lower oriented graphite. Infrared and energy dispersive x-ray spectroscopies analysis confirmed additional functional groups were not generated in any of the treated materials. X-ray diffraction showed that graphene nanoplatelets obtained in this work are conformed by 20-30 nm of thickness, also corroborated with atomic force microscopy. According to Raman results, graphene nanoplatelets possess a high structural quality which is similar to the initial graphite. Hence, this process represents a viable option to obtain graphene nanoplatelets through an easy, green and large-scalable route.