Li Shuaiqi, Guo Ruiang, Li Qian, Zhang Ruike, Zhang Jiawei
College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 400000, China.
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China.
Small. 2024 Oct;20(42):e2310316. doi: 10.1002/smll.202310316. Epub 2024 Jun 19.
Following the diverse structural characteristics and primary usage, diamond products include nano-polycrystalline diamond (NPD), micron-polycrystalline diamond (MPD), diamond film, porous diamond, and diamond wire drawing die. Among them, porous diamond possesses a distinctive combination of flexible surface functionality and a remarkably high surface area-to-volume ratio (SA/V) compared to traditional bulk materials, which contributes to cross-cutting applications in catalysis, adsorption, and electrochemistry while retaining the superior traits of diamond, particularly its exceptional chemical inertia. To avoid etching or microwave plasma chemical vapor deposition (MPCVD) techniques, this study proposes a high-temperature and high-pressure method based on a soluble skeleton (HPHT-ss) as an efficient and inexpensive approach for synthesizing millimeter-level porous diamonds. Interestingly, porous diamond synthesized by HPHT-ss exhibits multiscale pores distributed as macropores (average 75 µm) and mesopores (average 19 nm), which gives it a unique feature compared with other methods. Pertinent temperature-pressure conditions, HPHT-ss synthesis, and the formation mechanism of porous diamonds are also thoroughly discussed.
根据不同的结构特征和主要用途，金刚石产品包括纳米多晶金刚石（NPD）、微米多晶金刚石（MPD）、金刚石薄膜、多孔金刚石和金刚石拉丝模。其中，与传统块状材料相比，多孔金刚石具有灵活的表面功能和极高的表面积与体积比（SA/V）的独特组合，这有助于其在催化、吸附和电化学等交叉领域的应用，同时保留了金刚石的卓越特性，特别是其出色的化学惰性。为避免蚀刻或微波等离子体化学气相沉积（MPCVD）技术，本研究提出了一种基于可溶性骨架的高温高压方法（HPHT-ss），作为一种高效且廉价的合成毫米级多孔金刚石的方法。有趣的是，通过HPHT-ss合成的多孔金刚石呈现出多尺度孔隙，分布为大孔（平均75 µm）和中孔（平均19 nm），这使其与其他方法相比具有独特的特征。本文还深入讨论了相关的温度-压力条件、HPHT-ss合成以及多孔金刚石的形成机制。
