Current material forming technologies suffer from internal stress and defects, leading to reduced mechanical properties and processing precision. This paper introduces a novel evaporate-casting strategy to create graphene superstructures with a curvature gradient, enabling the fabrication of robust structural materials with precisely designed shapes. The structure's arc-shaped graphene nanosheet assembly is tightened via capillary action during dehydration, inducing local bending. Precise control over shape is achieved by tuning axis-center distance and tilt angle. Internal stress reinforcement leads to high joining strength (~200 MPa), addressing challenges in current material forming technologies.

Bing Lu, Li Yu, Yajie Hu, Ying Wang, Fei Zhao, Yang Zhao, Feng Liu, Huhu Cheng, Liangti Qu