Liquid-phase synthesis of vertically aligned carbon nanotubes and related nanomaterials on preheated alloy substrates
Liquid-phase synthesis of vertically aligned carbon nanotubes and related nanomaterials on preheated alloy substrates
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DOI：
10.7567/jjap.57.02cc07
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发表时间：
2018-01
影响因子：
1.5
通讯作者：
Kiyofumi Yamagiwa
中科院分区：
文献类型：
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作者：
Kiyofumi Yamagiwa
采用液相法在合金基体上选择性地合成了碳纳米管及相关纳米碳。将富Fe和Ni的不锈钢（分别为JIS SUS316L和Inconel® 600）和Ni-Cu合金（Monel® 400）基底用于合成，并且将每个基底在空气中预热以促进催化剂纳米层在表面上的自形成。衬底在乙醇中电阻加热而不添加任何催化剂以生长CNT。当采用预热工艺时，CNT的产率有效地增加。在SUS316L衬底上生长了高度取向的碳纳米管阵列，而在其他衬底上观察到非取向的碳纳米管和独特的扭曲纤维。在预热的SUS316L衬底上选择性地形成了一层Fe氧化物层，促进了CNT阵列的生长。包括循环伏安法的阵列的表征表明，碳纳米管具有相对缺陷丰富的表面，这是一个理想的特性，其应用，如电容器的电极材料。
Carbon nanotubes (CNTs) and related nanocarbons were selectively synthesized on commercially available alloy substrates by a simple liquid-phase technique. Fe- and Ni-rich stainless-steel (JIS SUS316L and Inconel®600, respectively) and Ni–Cu alloy (Monel®400) substrates were used for the synthesis, and each substrate was preheated in air to promote the self-formation of catalyst nanolayers on the surface. The substrates were resistance heated in ethanol without any addition of catalysts to grow CNTs. The yield of the CNTs effectively increased when the preheating process was employed. Highly aligned CNT arrays grew on the SUS316L substrate, while non-aligned CNTs and distinctive twisted fibers were observed on the other substrates. An Fe oxide layer was selectively formed on the preheated SUS316L substrate promoting the growth of the CNT arrays. Characterizations including cyclic voltammetry for the arrays revealed that the CNTs possess a comparatively defect-rich surface, which is a desirable characteristic for its application such as electrode materials for capacitors.