当前位置: X-MOL 学术J. Eur. Ceram. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Unravelling the optimization of few-layer graphene crystallinity and electrical conductivity in ceramic composites by Raman spectroscopy
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2021-09-16 , DOI: 10.1016/j.jeurceramsoc.2021.09.025
Carmen Muñoz-Ferreiro 1, 2, 3 , Cristina López-Pernía 1 , Ángela Gallardo-López 1 , Rosalía Poyato 3
Affiliation  

Zirconia composites with few-layer graphene (FLG) were prepared by two powder processing routines -ultrasonic agitation or planetary ball milling- and spark plasma sintered at 1250 and 1300 °C. An in-depth study of the crystallinity of FLG, in terms of presence and nature of defects, was performed by Raman spectroscopy, revealing enhanced FLG crystallinity after sintering. This enhancement was more noticeable in the composites sintered at the highest temperature, with lower amount of structural defects and amorphous carbon. However, remaining amorphous carbon was detected in the composites prepared by planetary ball milling even after sintering at the highest temperature, resulting in lower electrical conductivities. Optimum results in terms of electrical conductivity were achieved for the composites prepared by ultrasonic agitation and sintered at 1300 °C, with electrical percolation limit below 2.5 vol% FLG and high electrical conductivity (678 S/m for 5 vol% FLG), as result of the enhanced FLG crystallinity after sintering.



中文翻译:

通过拉曼光谱揭示陶瓷复合材料中少层石墨烯结晶度和电导率的优化

具有少层石墨烯 (FLG) 的氧化锆复合材料通过两种粉末加工程序 - 超声波搅拌或行星球磨 - 以及在 1250 和 1300 °C 下烧结的放电等离子体制备。通过拉曼光谱对 FLG 结晶度的存在和缺陷性质进行了深入研究,揭示了烧结后 FLG 结晶度的提高。这种增强在最高温度下烧结的复合材料中更为明显,结构缺陷和无定形碳的数量较少。然而,即使在最高温度下烧结后,通过行星式球磨制备的复合材料中仍检测到剩余的无定形碳,导致电导率降低。

更新日期:2021-10-19
down
wechat
bug