The preparation of uniform and well-dispersed catalysts is crucially important for the controlled growth of single-walled carbon nanotubes (SWCNTs) on substrates. We used graphene oxide (GO) as a support to prepare well-dispersed CoWO₄ nanoparticles with a narrow diameter distribution. When using GO- supported CoWO₄ as the catalyst precursor and performing the SWCNT growth under the optimized chemical vapor deposition conditions, we realized the diameter-controlled growth of SWCNTs with the mean size of 1.74 ± 0.18 nm. CoWO₄ is a superior catalyst precursor that can be used to obtain catalyst nanoparticles with a well-controlled size. GO shows to be a feasible substrate, presenting oxygen-containing groups which act as both the binding sites to facilitate the formation of uniform nanoparticles and hydrophilic groups to ensure a good dispersibility in aqueous solution. This strategy may find wide applications in the preparation of various functional nanomaterials.

中文翻译：

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氧化石墨烯负载的钨酸钴作为催化剂前体，用于单壁碳纳米管的选择性生长

均匀且分散良好的催化剂的制备对于在基材上控制单壁碳纳米管（SWCNT）的生长至关重要。我们使用氧化石墨烯（GO）作为载体来制备具有窄直径分布的均匀分散的CoWO ₄纳米颗粒。当使用GO负载的CoWO ₄作为催化剂前体并在优化的化学气相沉积条件下进行SWCNT生长时，我们实现了直径控制的SWCNT的生长，平均粒径为1.74±0.18 nm。第_4版是优异的催化剂前体，可用于获得尺寸控制良好的催化剂纳米颗粒。GO显示为可行的底物，具有含氧基团，其充当结合位点以促进均匀纳米颗粒的形成和亲水基团以确保在水溶液中的良好分散性。该策略可以在制备各种功能纳米材料中找到广泛的应用。