Zhuang Hao, Yang Nianjun, Fu Haiyuan, Zhang Lei, Wang Chun, Huang Nan, Jiang Xin
Institute of Materials Engineering, University of Siegen , Paul-Bonatz-Str. 9-11, 57076 Siegen, Germany.
ACS Appl Mater Interfaces. 2015 Mar 11;7(9):5384-90. doi: 10.1021/am508851r. Epub 2015 Feb 26.
A porous diamond network with three-dimensionally interconnected pores is of technical importance but difficult to be produced. In this contribution, we demonstrate a simple, controllable, and "template-free" approach to fabricate diamond networks. It combines the deposition of diamond/β-SiC nanocomposite film with a wet-chemical selective etching of the β-SiC phase. The porosity of these networks was tuned from 15 to 68%, determined by the ratio of the β-SiC phase in the composite films. The electrochemical working potential and the reactivity of redox probes on the diamond networks are similar to those of a flat nanocrystalline diamond film, while their surface areas are hundreds of times larger than that of a flat diamond film (e.g., 490-fold enhancement for a 3 μm thick diamond network). The marriage of the unprecedented physical/chemical features of diamond with inherent advantages of the porous structure makes the diamond network a potential candidate for various applications such as water treatment, energy conversion (batteries or fuel cells), and storage (capacitors), as well as electrochemical and biochemical sensing.
具有三维互连孔隙的多孔金刚石网络具有重要的技术意义，但难以制备。在本论文中，我们展示了一种简单、可控且“无模板”的方法来制备金刚石网络。该方法将金刚石/β-SiC纳米复合膜的沉积与β-SiC相的湿化学选择性蚀刻相结合。这些网络的孔隙率从15%调整到68%，这取决于复合膜中β-SiC相的比例。金刚石网络上的电化学工作电位和氧化还原探针的反应性与平坦的纳米晶金刚石膜相似，但其表面积比平坦金刚石膜大数百倍（例如，对于3μm厚的金刚石网络，增强了490倍）。金刚石前所未有的物理/化学特性与多孔结构的固有优势相结合，使得金刚石网络成为各种应用的潜在候选材料，如水处理、能量转换（电池或燃料电池）、存储（电容器）以及电化学和生化传感。
