▎ 摘　　要

NOVELTY - One pot, self-assembled process for producing individual and dispersible graphene nanospheres at near ambient conditions, comprises (a) sonicating graphite oxide sheets followed by suspending it in an aqueous solution containing a cationic surfactant and an alkaline solution to obtain a reaction mixture, (b) ultrasonically treating the reaction mixture, (c) stirring the treated mixture by addition of an inorganic source with organic substitution slowly, and (d) washing the mixture with an organic solvent, separating, drying, and treating with mild acid solution to afford graphene nanospheres. USE - The one pot, self-assembled process is useful for producing individual and dispersible graphene nanospheres at near ambient conditions (claimed) that are useful in: bioimaging, optoelectronics and drug delivery applications; electronics and biomedical techniques; supercapacitor and nano-electronics; and photothermal therapy and hyperthermia. ADVANTAGE - The process: is one pot, self-assembled process (claimed); provides individual and dispersible graphene nanospheres which provide easy confinement of cargo/active functional materials in bioimaging, optoelectronics and drug delivery applications, and is obtained economically in a simple manner; is carried out at near ambient synthesis conditions; provides direct conversion of 2 dimensional to 3 dimensional graphene structure; does not require hard templates; provides uniform and better size control of the nanospheres; provides the nanospheres with size tunability of 200-2500 nm; is ideal for large scale production; and provides the nanospheres which are excellent material for photothermal therapy and hyperthermia at low concentration (0.05-0.5 mg/ml) in low exposure time and low power density of near-infrared laser source.