Zhang Daohong, Zhang Yunhe, Miao Menghe
Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, Wuhan, 430074, People's Republic of China. CSIRO Materials Science and Engineering, PO Box 21, Belmont, VIC 3216, Australia.
Nanotechnology. 2014 Jul 11;25(27):275702. doi: 10.1088/0957-4484/25/27/275702. Epub 2014 Jun 24.
Dry spun carbon nanotube yarns made from vertically aligned multiwalled carbon nanotube forests possess high mechanical strength and behave like semiconductors with electrical conductivity of the order of 4 × 10(4) S m(-1). Coating a submicron-thick film of silver particle-filled polymer on the surface increased the electrical conductivity of the carbon nanotube yarn by 60-fold without significantly sacrificing its mechanical strength. The transitional characteristics of the silver-coated carbon nanotube yarn were investigated by varying the take-up ratio of the silver coating. A step change in conductivity was observed when the silver content in the coated yarn was between 7 and 10 wt% as a result of the formation of connected silver particle networks on the carbon nanotube yarn surface.
由垂直排列的多壁碳纳米管森林制成的干纺碳纳米管纱线具有高机械强度，并且表现得像半导体，电导率约为4×10(4) S m(-1)。在表面涂覆一层亚微米厚的银颗粒填充聚合物薄膜，可使碳纳米管纱线的电导率提高60倍，而不会显著牺牲其机械强度。通过改变银涂层的卷取比，研究了银涂层碳纳米管纱线的转变特性。当涂层纱线中的银含量在7至10 wt%之间时，由于在碳纳米管纱线表面形成了连通的银颗粒网络，观察到电导率有阶跃变化。
