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实现耐用电子产品的多功能氟化石墨烯复合涂层:超低腐蚀速率和高电绝缘钝化
Carbon
(
IF
10.5
)
Pub Date : 2022-04-11
, DOI:
10.1016/j.carbon.2022.04.004
Muhammad Usama Arshad
,
Dipak Dutta
,
Yu Yu Sin
,
Shen Wu Hsiao
,
Chih Yi Wu
,
Bor Kae Chang
,
Liming Dai
,
Ching Yuan Su
石墨烯被认为是最好的防腐材料;然而,由于其固有的导电性,当它作为填料添加到聚合物复合涂层中超过某个负载阈值时,反而会极大地促进电偶腐蚀。电绝缘二维材料,例如六方氮化硼 ( h-BN) 可能是替代品,但由于其与聚合物基体的分散性/相容性差,也会失败,从而限制了它们的实际应用。在此,我们报告了一种独特的氟化石墨烯 (FG),具有可优化的 F/C 和 C/O 比(多种表面化学性质),由简便且环保的电化学剥离石墨烯(ECG,其表面性质为可通过不同的电化学条件进行调节),并提出了一种用于电子钝化的高聚合物基质兼容复合材料的一步且具有成本效益的氟化途径;事实上,这种合金对表面功能进行了两步优化,从而实现了 FG 和复合材料所需的性能。通过调整和了解它们的疏水性、导电性、氟化程度等,−8 毫米/年;电流 = 3.37 × 10 -12 A cm -2)。通过 CR 与 FG 负载单调降低所表明的稳健扩散屏障的构建导致 FG 优于其他报道的功能化石墨烯和 BN 相关的 2D 材料。将 FG 复合材料的使用扩展到柔性印刷电路板 (PCB) 等非金属基材是一个独创的想法,在防止由于电绝缘性和高击穿性而导致的电气短路风险的同时,实现了卓越的腐蚀抑制FG的电压;因此,即使在恶劣的环境中,它也可以成为电子设备上的耐用钝化层。这项工作代表了防腐技术的突破,并为探索用于多功能电子产品长期钝化的极不渗透复合材料提供了一种新策略。
"点击查看英文标题和摘要"
Multi-functionalized fluorinated graphene composite coating for achieving durable electronics: Ultralow corrosion rate and high electrical insulating passivation
Graphene is regarded as the best anticorrosion material; however, due to its inherent electrical conductivity, it, instead, greatly promotes galvanic corrosion when added as a filler above a certain loading threshold in a polymer composite coating. Electrically insulating 2D materials such as hexagonal boron nitride (h-BN), which could be alternatives, also fail due to their poor dispersibility/compatibility with the polymer matrix, thus limiting their practical applications. Herein, we report a unique fluorinated graphene (FG), with optimizable F/C and C/O ratios (versatile surface chemistry properties), produced by scalable fluorination of facile and eco-friendly electrochemically exfoliated graphene (ECG, surface properties of which are tunable by varying electrochemical conditions) and propose a one-step and cost-effective fluorination route towards highly polymer matrix compatible composite for electronic passivation; in fact this alloys two steps optimization of surface functionalities leading to required properties of FG and the composite. By tuning and understanding their hydrophobicity, electrical conductivity, extent of fluorination, etc., through molecular dynamics (MD) simulations as well, with just 1% filler loading, the FG-polymer-composite shows the superior anticorrosion performance (corrosion rate (CR) = 7.83 × 10−8 mm/year; current = 3.37 × 10−12 A cm−2). Construction of a robust diffusion barrier indicated by a monotonic decrease in CR with FG loading leads FG to outperform other reported functionalized graphene and BN-related 2D materials. Extension of the use of FG composites to a nonmetallic substrate such as a flexible printed circuit board (PCB) is an original idea, and superior corrosion inhibition is achieved while preventing the risk of electrical short circuits due to the electrical insulating nature and the high breakdown voltage of FG; thus, making it a durable passivation layer on electronic devices, even in harsh environments. This work represents a breakthrough in anticorrosion technology and provides a novel strategy for exploring extremely impermeable composites for the long-term passivation of multi-functionalized electronics.
更新日期:2022-04-11