▎ 摘　　要

A simple and effective approach, i.e., an emulsion blending followed by freeze-drying process, was developed to construct an electrically conductive and stretchable reduced graphene oxide (rGO)-carbon nanotube (CNT) network in styrene-butadiene rubber (SBR) composites. The rGO-CNT hybrids with sandwich structure were prepared by one-step hydrothermal process. One-dimensional carbon nano-tubes, acted as spacers, were inserted between two-dimensional rGO sheets, which could effectively prevent the restacking of graphene sheets and the agglomeration of carbon nanotubes. Besides, carbon nanotubes connected with rGO sheets as bridges, facilitating the construction of a one-and two-dimensional interconnected network in SBR composites. The electrical conductivity of SBR/rGO-CNT (100/10.4) composite was 3.62 S/cm, which was significantly enhanced by 14 orders of magnitude as compared with that of SBR. Interestingly, the SBR/rGO-CNT composites could maintain their high electrical conductivity under low tensile strain. The high electrical conductivity and stretchable performance of the SBR composites were attributed to the one-and two-dimensional interconnected network, which was constructed via carbon nanotubes connecting rGO sheets and could be deformed under low strain. This work provides a new insight into the fabrication of stretchable composites with high electrical conductivity for versatile and practical applications. (C) 2019 Elsevier Ltd. All rights reserved.