Misak H, Asmatulu R, Whitman J, Mall S
J Nanosci Nanotechnol. 2015 Mar;15(3):2283-8. doi: 10.1166/jnn.2015.9592.
Carbon nanotube (CNT) multi-yarn was cross-linked together at elevated temperatures using a poly- mer, with the intent of improving their strength and electrical conductivity. They were functionalized using an acid treatment and immersed in a bath of different concentrations (0.5%, 0.1%, and 0.2%) of polyvinylpyrrolidone (PVP). Then they were placed in an oven at various temperatures (180 °C, 200 °C, and 220 °C) in order to cause cross-linking among the carbon nanotube yarns. The phys- ical, chemical, electrical, and mechanical properties of the cross-linked yarns were investigated. The yarns cross-linked at higher temperatures and greater concentrations of PVP had a greater increase in linear mass density, indicating that the cross-linking process had worked as expected. Yarns that were cross-linked at lower temperatures had greater tensile strength and better spe- cific electrical conductivity. Those that were treated with a greater concentration of polymer had a greater ultimate tensile strength. All these results are encouraging first step, but still need further development if CNT yarn is to replace copper wire.
碳纳米管（CNT）复丝在高温下使用聚合物进行交联，目的是提高其强度和导电性。通过酸处理对它们进行功能化，并将其浸入不同浓度（0.5%、0.1%和0.2%）的聚乙烯吡咯烷酮（PVP）溶液中。然后将它们置于不同温度（180℃、200℃和220℃）的烘箱中，以使碳纳米管纱线之间发生交联。对交联纱线的物理、化学、电学和力学性能进行了研究。在较高温度和较高PVP浓度下交联的纱线，其线质量密度有更大的增加，这表明交联过程按预期发挥了作用。在较低温度下交联的纱线具有更高的拉伸强度和更好的比电导率。用更高浓度聚合物处理的纱线具有更高的极限拉伸强度。所有这些结果都是令人鼓舞的第一步，但如果碳纳米管纱线要取代铜线，仍需要进一步发展。
