Broniszewski Kamil, Woźniak Jarosław, Cygan Tomasz, Kostecki Marek, Moszczyńska Dorota, Chmielewski Marcin, Dydek Kamil, Olszyna Andrzej
Faculty of Materials Science and Engineering, Warsaw University of Technology, ul. Wołoska 141, 02-507 Warsaw, Poland.
Łukasiewicz Research Network, Institute of Microelectronics and Photonics, ul. Wólczyńska 133, 01-919 Warsaw, Poland.
Nanomaterials (Basel). 2024 Mar 21;14(6):555. doi: 10.3390/nano14060555.
Reduced graphene oxide, due to its structure, exhibits anisotropic properties, which are particularly evident in electrical and thermal conductivity. This study focuses on examining the influence of reduced graphene oxide in silicon carbide on these properties in directions perpendicular and parallel to the direction of the aligned rGO flakes in produced composites. Reduced graphene oxide is characterized by very high in-plane thermal and electrical conductivity. It was observed that the addition of rGO increases thermal conductivity from 64 W/mK (reference sample) up to 98 W/mK for a SiC-3 wt.% rGO composite in the direction parallel to the rGO flakes. In the perpendicular direction, the values were slightly lower, reaching up to 84 W/mK. The difference observed in electrical conductivity values is more significant and is 1-2 orders of magnitude higher for the flakes' alignment direction. The measured electrical conductivity increased from 1.2710 S/m for the reference SiC sinter up to 1.55 × 10 S/m and 1.2410 S/m for the composites with 3 wt.% rGO for the perpendicular and parallel directions, respectively. This represents an enhancement of four orders of magnitude, with a clearly visible influence of the anisotropy of the rGO. The composite's enhanced electrical and thermal conductivity make it particularly attractive for electronic devices and high-power applications.
还原氧化石墨烯因其结构而表现出各向异性特性，这在电导率和热导率方面尤为明显。本研究着重考察碳化硅中还原氧化石墨烯对所制备复合材料中与取向排列的还原氧化石墨烯薄片方向垂直和平行方向上这些特性的影响。还原氧化石墨烯的特征在于其极高的面内热导率和电导率。据观察，对于碳化硅-3 wt.%还原氧化石墨烯复合材料，在与还原氧化石墨烯薄片平行的方向上，添加还原氧化石墨烯可使热导率从64 W/mK（参考样品）提高至98 W/mK。在垂直方向上，该值略低，最高可达84 W/mK。观察到的电导率值差异更为显著，对于薄片的取向方向，其电导率高出1 - 2个数量级。测得的电导率从参考碳化硅烧结体的1.27×10⁻³ S/m分别提高到含3 wt.%还原氧化石墨烯复合材料在垂直和平行方向上的1.55×10⁻² S/m和1.24×10⁻² S/m。这代表着提高了四个数量级，还原氧化石墨烯的各向异性影响清晰可见。该复合材料增强的电导率和热导率使其对电子器件和高功率应用特别具有吸引力。
