▎ 摘　　要

NOVELTY - Preparation of three-dimensional carbon nanotube/reduced graphene oxide heterojunction sensitive device involves: (S1) performing electrostatic self-assembly of heterojunctions by sequentially coating carbon nanotubes and graphene oxide on a surface of magnetic submicron spheres to form a three-dimensional magnetic carbon nanotube/reduced graphene oxide heterojunction; (S2) performing directional arrangement of heterojunctions by during the dripping process, using a magnetic field to control the heterojunctions to form directional arrangements between the electrodes to form a chain-like multi-conducting channel; and (S3) carrying out reduction treatment by reducing graphene oxide to complete the construction of a gas sensor device. USE - The method is useful for preparing three-dimensional carbon nanotube/reduced graphene oxide heterojunction sensitive device, which is useful for preparing gas sensors (claimed). ADVANTAGE - The method enables simple and large-scale industrial preparation of the three-dimensional carbon nanotube/reduced graphene oxide heterojunction sensitive device with low sensitivity and high uniformity, efficiency and stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) the three-dimensional carbon nanotube/reduced graphene oxide heterojunction sensitive device; and (2) use of the three-dimensional carbon nanotube/reduced graphene oxide heterojunction sensitive device for preparing gas sensors, which involves the step (S1)-(S3) as per above se, and finally welding and encapsulating the sensor device.