Research Progress on the Formation and Regulation Mechanisms of sp3 Amorphous Carbon under High Pressure
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摘要: 自2021年sp3非晶碳块体材料被成功制备以来,其所展现出的超高硬度、各向同性、易加工成型和独特的电子结构等优异特性,在超精密加工和光电探测领域具有重要的应用潜力,引起了学术界对该材料的大量关注。相关研究主要围绕高温高压条件下基于富勒烯制备的sp3非晶碳材料的形成机制、热力学稳定性、结构性能调控以及制备工艺优化等方面展开,不仅深化了对sp3非晶碳形成机理的认识,还推动了其功能化应用的进一步发展。系统总结了相关研究进展,并对sp3非晶碳的大尺寸高质量制备、精密成型及功能应用拓展等未来重点发展方向进行了展望。Abstract: Since the successful synthesis of bulk sp3 amorphous carbon in 2021, this material has attracted considerable attention owing to its ultrahigh hardness, mechanical isotropy, potential for shaping and machining, and distinctive electronic structure. These features make it a promising candidate for applications in ultra-precision machining and optoelectronic detection. Recent studies have mainly focused on the formation mechanism, thermodynamic stability, structural and property regulation, and synthesis process optimization of sp3 amorphous carbon materials derived from fullerenes under high-pressure and high-temperature conditions. These studies have not only deepened the understanding of the formation mechanism of sp3 amorphous carbon, but also promoted the further development of its functional applications. This review systematically summarizes the relevant research progress and discusses future key directions, including the large-size and high-quality synthesis, precision shaping, and functional application expansion of sp3 amorphous carbon.
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图 8 非晶金刚石-氮化硼复合材料的压痕断裂行为:(a) 在25 GPa和
1400 ℃条件下获得的样品压痕区域的断裂形貌,(b)~(c) 图8(a)的局部放大图,(d) 非晶金刚石阻碍裂纹尖端扩展示意图[38]Figure 8. Indentation fracture behavior of the amorphous diamond-boron nitride composite material: (a) fracture morphology in the indentation area of the sample obtained at 25 GPa and
1400 ℃; (b)−(c) zooming in images of Fig. 8(a); (d) schematic diagram showing amorphous diamond hindering crack-tip propagation[38]表 1 不同制备方法获得的非晶碳材料的结构与性能比较[6, 9, 12–13, 15]
Table 1. Comparison of structure and properties of amorphous carbon materials obtained by different preparation methods[6, 9, 12–13, 15]
Preparation method Precursor Pressure-temperature (PT) condition Sample form and size Structural characteristic Mechanical property Vapor deposition Hydrocarbon gas, graphite Ambient PT Thin film sp2-sp3 bonding (sp3
content≤88%); partially hydrogenatedMaximum hardness of approximately 80 GPa Shock compression Fullerene C60 Transient HTHP (55 GPa, 2000 K)Micron-sized fragment Nearly fully sp3-hybridized, multiphase containing crystalline diamond components Systematic mechanical property data are still lacking Laser-heated DAC Glassy carbon Static HTHP
(50 GPa,1800 K)Micron-sized sample Fully sp3-hybridized Bulk modulus of 377.6 GPa (theoretically) Large-volume press Fullerene C60 Static HTHP
(27 GPa,1173 −1273 K)Millimeter-sized bulk sample Nearly fully sp3-hybridized (95.1%), containing DLC clusters with short- and medium-range order Vickers hardness of 101.9 GPa and elastic modulus of 1182 GPaLarge-volume press Fullerene C70 Static HTHP
(30 GPa,1373 K)Millimeter-sized bulk sample Nearly fully sp3-hybridized (96.2%), containing DLC clusters with short- and medium-range order Vickers hardness of 109.8 GPa -
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