As an advanced amorphous material, sp³ amorphous carbon exhibits exceptional mechanical, thermal and optical properties, but it cannot be synthesized by using traditional processes such as fast cooling liquid carbon and an efficient strategy to tune its structure and properties is thus lacking. Here we show that the structures and physical properties of sp³ amorphous carbon can be modified by changing the concentration of carbon pentagons and hexagons in the fullerene precursor from the topological transition point of view. A highly transparent, nearly pure sp³−hybridized bulk amorphous carbon, which inherits more hexagonal-diamond structural feature, was synthesized from C₇₀ at high pressure and high temperature. This amorphous carbon shows more hexagonal-diamond-like clusters, stronger short/medium-range structural order, and significantly enhanced thermal conductivity (36.3 ± 2.2 W m⁻¹ K⁻¹) and higher hardness (109.8 ± 5.6 GPa) compared to that synthesized from C₆₀. Our work thus provides a valid strategy to modify the microstructure of amorphous solids for desirable properties.

作为一种先进的非晶材料，sp ³非晶碳表现出优异的机械、热学和光学性能，但它无法使用快速冷却液态碳等传统工艺合成，因此缺乏调整其结构和性能的有效策略。在这里，我们从拓扑转变的角度证明，通过改变富勒烯前体中碳五边形和六边形的浓度可以改变sp ^{3无定形碳的结构和物理性质。}_{以C 70}为原料，在高压高温下合成了一种高度透明、接近纯的sp ³杂化块状非晶碳，它继承了更多的六方金刚石结构特征。与普通碳相比，这种无定形碳表现出更多的六方金刚石状团簇、更强的短/中程结构有序性、显着增强的导热性（36.3 ± 2.2 W m ⁻¹ K ⁻¹）和更高的硬度（109.8 ± 5.6 GPa）。由C ₆₀合成。因此，我们的工作提供了一种有效的策略来改变非晶固体的微观结构以获得所需的性能。