▎ 摘　　要

Carbon-based microassemblies (CMs) have attracted significant attention in numerous applications due to their unique hierarchical structures and delicate building blocks, especially when hollow carbon spheres (HCSs) are reasonably introduced into the construction. Herein, a new design for novel HCSs-combined CMs is proposed. Remarkably, the HCSs are linear carbon bubbles linked one-by-one, arranging into necklaces decorating on the graphene microfolds. Detailed thermal analysis confirm that high tem-peratures straighten the linked carbon bubbles into bamboo-like carbon nanofibers, evidently due to the attenuation of doping degree. Benefiting from the abundant active sites of carbon bubbles, the obtained CMs exhibit satisfactory electrocatalytic activity for oxygen reduction reactions. This work establishes a bridge to precisely control the synthesis of carbon-based hierarchical architectures. (c) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.