▎ 摘　　要

NOVELTY - Synthesizing reduced graphene oxide, comprises: selecting carbonaceous material consisting of soot obtained directly from residual soot formed on cooking grills; mixing soot with at least one acid to obtain solution; adding first oxidant that is potassium permanganate; stirring suspension while maintaining temperature at 35 degrees C for 10 minutes; raising the temperature of the suspension to constant 60 degrees C for 15 minutes while adding deionized water to suspension; adding second oxidant to suspension; isolating the reduced graphene oxide nanoparticles; and washing. USE - The method is useful for synthesizing reduced graphene oxide (claimed) which is used in light transparent electrode for solar cells and light emitting diodes, as biosensors to detect hormonal catecholamine molecules, avid in, and DNA, as an electrochemical glucose sensor and in solar cell devices. ADVANTAGE - The method: is simple, non-toxic, cost-effective, quick, and eco-friendly; and provides the graphene oxide nanopartilces have resistance of 108 to 1010 Ohm. DETAILED DESCRIPTION - Synthesizing reduced graphene oxide, comprises: selecting a carbonaceous material, where the carbonaceous material consists of soot obtained directly from the residual soot formed on cooking grills; mixing the soot with at least one acid to obtain a solution; adding a first oxidant to the solution to provide a suspension, where the first oxidant is potassium permanganate; stirring the suspension while maintaining a temperature of the suspension at 35 degrees C for 10 minutes; raising the temperature of the suspension to a constant 60 degrees C for 15 minutes while adding deionized water to the suspension; adding a second oxidant to the suspension to provide reduced graphene oxide nanoparticles, where the second oxidant is hydrogen peroxide; isolating the reduced graphene oxide nanoparticles, where the reduced graphene oxide nanoparticles are isolated by centrifugation; and washing the reduced graphene oxide nanoparticles with deionized water and 5% hydrochloric acid solution and drying the nanoparticles at 100 degrees C.