Yu Pengmei, Coll Mariona, Amade Roger, Alshaikh Islam, Pantoja-Suárez Fernando, Pascual Esther, Andújar José Luís, Serra Enric Bertran
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, 08193 Bellaterra, Barcelona, Spain.
Dalton Trans. 2020 Apr 7;49(13):4136-4145. doi: 10.1039/c9dt04908h. Epub 2020 Mar 10.
The combination of carbon nanotubes with transition metal oxides can exhibit complementary charge storage properties for use as electrode materials for next generation energy storage devices. One of the biggest challenges so far is to synthesize homogeneous oxide coatings on carbon nanotube structures preserving their integrity. Here we present the formation of conformal coatings of FeO on vertically aligned carbon nanotubes obtained by atomic layer deposition. We investigate the effect of pristine, nitrogen plasma and water plasma treated carbon nanotube surfaces on the ALD-growth of FeO using ferrocene and ozone precursors. The surface morphology, coating thickness, microstructure and surface chemistry of iron oxide-carbon nanotube composites and their ultimate influence on the electrochemical behavior of the composites are evaluated. The most effective surface functionalization is that achieved by HO plasma treatment, whereas untreated carbon nanotubes, despite the lack of active sites in the starting pristine surface, can be coated with an inhomogeneous FeO film.
碳纳米管与过渡金属氧化物的组合可展现出互补的电荷存储特性，用作下一代储能装置的电极材料。到目前为止，最大的挑战之一是在保持碳纳米管结构完整性的同时，在其结构上合成均匀的氧化物涂层。在此，我们展示了通过原子层沉积在垂直排列的碳纳米管上形成FeO保形涂层。我们使用二茂铁和臭氧前驱体，研究了原始的、经氮等离子体和水等离子体处理的碳纳米管表面对FeO原子层沉积生长的影响。评估了氧化铁-碳纳米管复合材料的表面形态、涂层厚度、微观结构和表面化学及其对复合材料电化学行为的最终影响。最有效的表面功能化是通过HO等离子体处理实现的，而未经处理的碳纳米管，尽管起始原始表面缺乏活性位点，但仍可被不均匀的FeO膜包覆。
