title: Scratch-resistant, highly conductive, and high-strength carbon nanotube-based composite yarns.
abstract: High-strength and conductive carbon nanotube (CNT) yarns are very attractive in many potential applications. However, there is a difficulty when simultaneously enhancing the strength and conductivity of CNT yarns. Adding some polymers into CNT yarns to enhance their strength will decrease their conductivity, while treating them in acid or coating them with metal nanoparticles to enhance their conductivity will reduce their strength. To overcome this difficulty, here we report a method to make high-strength and highly conductive CNT-based composite yarns by using a continuous superaligned CNT (SACNT) yarn as a conductive framework and then inserting polyvinyl alcohol (PVA) into the intertube spaces of the framework through PVA/dimethyl sulphoxide solution to enhance the strength of yarns. The as-produced CNT/PVA composite yarns possess very high tensile strengths up to 2.0 GPa and Young's moduli more than 120 GPa, much higher than those of the CNT/PVA yarns reported. The electric conductivity of as-produced composite yarns is as high as 9.2 × 10(4) S/m, comparable to HNO(3)-treated or Au nanoparticle-coated CNT yarns. These composite yarns are flexible, lightweight, scratch-resistant, very stable in the lab environment, and resistant to extremely humid ambient and as a result can be woven into high-strength and heatable fabrics, showing potential applications in flexible heaters, bullet-proof vests, radiation protection suits, and spacesuits.
authors.affiliation: Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Liu
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Sun
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Lin
authors.forename: Ruifeng
authors.initials: R
authors.lastname: Zhou
authors.forename: Jiaping
authors.initials: J
authors.lastname: Wang
authors.forename: Shoushan
authors.initials: S
authors.lastname: Fan
authors.forename: Kaili
authors.initials: K
authors.lastname: Jiang
mesh_terms: D004553:Electric Conductivity; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011312:Pressure; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013784:Textiles
chemical_list: D011108:Polymers