材料科学
微晶
纳米晶材料
化学工程
碳纤维
纳米-
钻石
催化作用
纳米技术
复合材料
冶金
有机化学
化学
复合数
工程类
作者
Shengqiang Ma,Yaohua Zhao,Hailong Li,Robert Farla,Zihan Zhang,Chao Zhou,Xiaole Zhao,Yanping Huang,Qing Liu,Kuo Bao,Baocheng Yang,Xingjin Yang,Pinwen Zhu,Qiang Tang,Tian Cui
出处
期刊:Small
[Wiley]
日期:2023-09-27
标识
DOI:10.1002/smll.202305512
摘要
Transparent nano-polycrystalline diamond (t-NPD) possesses superior mechanical properties compared to single and traditional polycrystalline diamonds. However, the harsh synthetic conditions significantly limit its synthesis and applications. In this study, a synthesis routine is presented for t-NPD under low pressure and low temperature conditions, 10 GPa, 1600 °C and 15 GPa, 1350 °C similar with the synthesis condition of organic precursor. Self-catalyzed hydrogenated carbon nano-onions (HCNOs) from the combustion of naphthalene enable synthesis under nearly industrial conditions, which are like organic precursor and much lower than that of graphite and other carbon allotropes. This is made possible thanks to the significant impact of hydrogen on the thermodynamics, as it chemically facilitates phase transition. Ubiquitous nanotwinned structures are observed throughout t-NPD due to the high concentration of puckered layers and stacking faults of HCNOs, which impart a Vickers hardness about 140 GPa. This high hardness and optical transparency can be attributed to the nanocrystalline grain size, thin intergranular films, absence of secondary phase and pore-free features. The facile and industrial-scale synthesis of the HCNOs precursor, and mild synthesis conditions make t-NPD suitable for a wide range of potential applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI