Abstract Carbon nanotube (CNT) film has attracted tremendous attention in functional material research for its unique structure and excellent properties. However, pristine CNT (PCNT) film is hydrophobic, and mechanical strength and conductivity are poor than reported individual CNT. These challenges impede its wide application. Highly efficient closed-loop recycling of both monomer and CNT film is a major challenge. Herein, hydrophilic CNT film with high mechanical strength and conductivity was prepared under the synergistic effects of in situ nitrogen doping and thiol-ene click reaction. The tensile strength, Young’s modulus, and electrical conductivity both in perpendicular and in longitudinal directions are 1,362, 1,658, 222, and 218% higher than those of PCNT film. Closed-loop recycling of CNT film and monomer with high recyclability (100 and 86.72%) has been achieved in a gentle acid environment. The CNT films are 100% recovered and reused to fabricate thiol-functionalized CNT film without deterioration of performance after three cycles, which provides a novel strategy for the preparation of high-performance CNT film and a pathway for high-efficiency closed-loop recycling of CNT film and monomer.

中文翻译：

---

高性能亲水性碳纳米管薄膜的闭环回收和制备

摘要 碳纳米管(CNT)薄膜以其独特的结构和优异的性能在功能材料研究中引起了极大的关注。然而，原始的 CNT (PCNT) 薄膜是疏水的，机械强度和导电性比报道的单个 CNT 差。这些挑战阻碍了它的广泛应用。单体和 CNT 薄膜的高效闭环回收是一项重大挑战。在此，在原位氮掺杂和硫醇-烯点击反应的协同作用下，制备了具有高机械强度和导电性的亲水性 CNT 薄膜。纵向和纵向的拉伸强度、杨氏模量和电导率均比PCNT薄膜高1,362、1,658、222和218%。在温和的酸性环境中实现了具有高可回收性（100% 和 86.72%）的 CNT 薄膜和单体的闭环回收。CNT薄膜100%回收再利用，可制备硫醇功能化的CNT薄膜，经过3次循环后性能不会下降，为高性能CNT薄膜的制备提供了新的策略，也为高效闭环循环再利用提供了途径。 CNT薄膜和单体。