Instituto de Nanociencia y Materiales de Aragon (INMA), Spanish National Research Council (CSIC), University of Zaragoza, 12 Calle de Pedro Cerbuna, 50009Zaragoza, Spain.
Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza, Mariano Esquillor Edificio I+D, 50018ZaragozaSpain.
ACS Nano. 2023 Feb 14;17(3):2506-2516. doi: 10.1021/acsnano.2c10125. Epub 2023 Jan 24.
Hybrid carbon nanomaterials, such as those that incorporate carbon nanotubes into graphene sheets, have been found to display interesting mechanical and electrical properties because of their covalent bonding and π-π stacking domains. However, synthesis of these hybrid materials is limited by the high energetic cost of techniques like chemical vapor deposition. Here, we demonstrate the solvent- and gas-free synthesis of a 2D carbon nanotube/graphene network through flash Joule heating of pristine carbon nanotubes. The relative proportion of each morphology in the hybrid material can be tuned by varying the pulse time, as confirmed by Raman spectroscopy and microscopy. Triboindentation of epoxy composites made with the hybrid material shows increases of 162% and 64% to the hardness and Young's modulus, respectively, compared with the neat epoxy. These results demonstrate that flash Joule heating can be used to inexpensively convert carbon nanotubes into a hybrid network of nanotubes and graphene for use as an effective reinforcing additive in epoxy composites.
杂化碳纳米材料，如将碳纳米管纳入石墨烯片的杂化材料，由于其共价键和π-π 堆积域，被发现具有有趣的机械和电学性能。然而，这些杂化材料的合成受到化学气相沉积等技术高能成本的限制。在这里，我们通过原始碳纳米管的闪光焦耳加热演示了一种 2D 碳纳米管/石墨烯网络的无溶剂和无气体合成。通过改变脉冲时间，可以调整杂化材料中每种形态的相对比例，这一点通过拉曼光谱和显微镜得到了证实。与纯环氧树脂相比，用杂化材料制成的环氧树脂的摩擦压痕硬度和杨氏模量分别提高了 162%和 64%。这些结果表明，闪光焦耳加热可以廉价地将碳纳米管转化为纳米管和石墨烯的杂化网络，用作环氧树脂复合材料中的有效增强添加剂。
