▎ 摘　　要

NOVELTY - Forming (m1) a cellulose acetate based reduced graphene oxide (CA-rGO) layer (306), comprises: selecting a substrate (302); spin-coating a cellulose acetate dispersion on the substrate to obtain a cellulose acetate layer (304); and applying a given temperature profile to the cellulose acetate layer to transform it into the CA-rGO layer. USE - The method is useful for forming the CA-rGO layer, which is useful in a sensor for measuring a physical parameter (claimed), and also in transparent and flexible electronics, supercapacitors, batteries, photodetectors and electromagnetic shielding. ADVANTAGE - The method: utilizes cellulose acetate as precursor to produce uniform ultrathin reduced graphene oxide films on various substrates and/or free-standing reduced graphene oxide powders; does not involve dangerous chemicals, hence does not negatively impact the health of the person making the reduced graphene oxide; and allows for a facile way of growing ultrathin reduced graphene oxide films on arbitrary substrates. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a sensor for measuring a physical parameter, comprising a substrate, many electrodes formed on the substrate, and a cellulose acetate derived reduced graphene oxide (CA-rGO) layer formed over the plural electrodes, where the CA-rGO layer and the electrodes are treated by chemical vapor deposition at a temperature of at least 600 degrees C; and (2) forming (m2) a CA-rGO device, comprising selecting the substrate, forming electrodes on the substrate, depositing a cellulose acetate dispersion on the electrodes to obtain the cellulose acetate layer, placing the substrate and the cellulose acetate layer in a chemical vapor deposition system (300), and applying a given temperature profile to the cellulose acetate layer to transform it into the CA-rGO layer. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a chemical vapor deposition system for forming the cellulose acetate based reduced graphene oxide thin films and powders. Chemical vapor deposition system (300) Substrate (302) Cellulose acetate layer (304) Cellulose acetate based reduced graphene oxide layer (306) Cellulose acetate based reduced graphene oxide powder material (307)