▎ 摘　　要

Tungsten (W) nanowires have a wide range of chemical, electronic, and mechanical applications. However, the modulus and strength of traditional W nanowires are quite low, and how to improve their mechanical performance remains a challenge. Here, we describe a novel graphene-coated W nanowires that demonstrate a Young's modulus of 885 GPa (twice that of W) and a fracture strength of up to 24.7 GPa (66% of the ideal strength). Both the Young's modulus and the fracture strength show a strong size effect, resulting from the graphene-nanowire core-shell structure. [GRAPHICS] IMPACT STATEMENT We report a novel graphene-coated W nanowires that demonstrate unprecedented Young's modulus (885 GPa, twice that of W) and fracture strength (24.7 GPa, 66% of the ideal strength).