Shen Yanfang, Pan Jiannan, Hu Xinyue, Wen Hui-Min, Xiao John Q, Hu Jun
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States.
ACS Appl Mater Interfaces. 2021 Feb 3;13(4):5418-5424. doi: 10.1021/acsami.0c14740. Epub 2021 Jan 19.
Nanowire arrays can be conveniently fabricated by electrodeposition methods using porous anodized alumina oxide templates. They have found applications in numerous fields. Nanotube arrays, with their hollow structure and much enhanced surface-to-volume ratio, as well as an additional tuning parameter in tube wall thickness, promise additional functions compared with nanowire arrays. Using a similar fabrication method, we have developed a facile and general method to fabricate metallic nanotubes (NTs). Using Ni NTs as a model system, the mechanism of the hydrogen-assisted NT growth was postulated and confirmed by controlling the hydrogen formation with conductive salts in an electrodeposition solution, which improves the H concentration but prevents the large H bubbles from blocking the nanochannel of a template. The controlled hydrogen generation forces the growth along the wall of nanochannels in the templates, leading to the NT formation. The magnetic properties can be controlled by the NT wall thickness, making these NTs useful for various applications.
纳米线阵列可以通过使用多孔阳极氧化铝模板的电沉积方法方便地制备。它们已在众多领域得到应用。纳米管阵列具有中空结构和大大提高的表面积与体积比，以及管壁厚度这一额外的调节参数，与纳米线阵列相比有望具备更多功能。使用类似的制备方法，我们开发了一种简便通用的制备金属纳米管（NTs）的方法。以镍纳米管作为模型系统，通过在电沉积溶液中用导电盐控制氢气生成来推测并证实了氢辅助纳米管生长的机制，这提高了氢浓度，但防止大的氢气泡阻塞模板的纳米通道。受控的氢气生成迫使沿着模板中纳米通道的壁生长，从而导致纳米管的形成。磁性可以通过纳米管壁厚度来控制，使得这些纳米管可用于各种应用。
