▎ 摘　　要

NOVELTY - A tungsten disulfide nanosheet/graphene composite nanomaterial comprises a layered structure of tungsten disulfide nanosheet and graphene composite in a ratio of 1:1-1:4. USE - Tungsten disulfide nanosheet/graphene composite nanomaterial. ADVANTAGE - The nanomaterial is prepared in a simple and convenient manner without consumption of organic solvents. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a tungsten disulfide nanosheet/graphene composite nanomaterial, which involves dispersing graphene oxide in deionized water, adding gemini surfactant to dispersed product and stirring, adding L- cysteine ??and tungsten ammonium thiosulfate and stirring, transferring mixed dispersion into a hydrothermal reaction kettle for hydrothermally reacting for 20-24 hours, cooling the reacted mixture to room temperature at 230-250 degrees C, collecting the solid product by centrifugation and washing with deionized water sufficiently followed by drying and finally heat-treating to obtain the finished product.