Li Ning, Liu Junhao, Zeng Wenfang, Xu Yawei, Li Jing
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, P. R. China.
National Key Laboratory of Spacecraft Thermal Control, Beijing Institute of Spacecraft System Engineering, Beijing 100086, P. R. China.
ACS Appl Mater Interfaces. 2024 Oct 30;16(43):59015-59021. doi: 10.1021/acsami.4c10163. Epub 2024 Oct 17.
In the domain of smart electronic devices, graphene films play a pivotal role due to their flexibility and high thermal conductivity. Within the realm of fabricating highly thermally conductive graphene films, Joule heating technology has garnered significant attention because of its capability for rapid temperature elevation and reduction of graphitization duration. However, substantial gas emission occurs during the reduction of graphene oxide films using this method, leading to immediate combustion and film fracturing, thereby limiting the rapid and uninterrupted production of graphene films. To address this challenge, a rapid reduction preparation process is introduced. This process initiates with a two-step reduction of graphene oxide films employing a reducing agent to establish gas escape pathways within the graphene films beforehand. Subsequently, the film is pressurized and Joule-heated using a graphite plate, with the entire heating process lasting only 800 s. The resulting graphene film exhibits a remarkable thermal conductivity of up to 1012W/(m·K). This method enhances the production efficiency of high thermal conductivity graphene films and is expected to further reduce production costs.
在智能电子设备领域，石墨烯薄膜因其柔韧性和高导热性而发挥着关键作用。在制造高导热性石墨烯薄膜的领域中，焦耳加热技术因其能够快速升温并缩短石墨化持续时间而备受关注。然而，使用这种方法在还原氧化石墨烯薄膜的过程中会产生大量气体排放，导致立即燃烧和薄膜破裂，从而限制了石墨烯薄膜的快速连续生产。为应对这一挑战，引入了一种快速还原制备工艺。该工艺首先采用还原剂对氧化石墨烯薄膜进行两步还原，以便预先在石墨烯薄膜内建立气体逸出通道。随后，使用石墨板对薄膜进行加压和焦耳加热，整个加热过程仅持续800秒。所得的石墨烯薄膜展现出高达1012W/(m·K)的显著热导率。此方法提高了高导热性石墨烯薄膜的生产效率，并有望进一步降低生产成本。
