Łukasiewicz Research Network-Lodz Institute of Technology, Department of Chemical Textiles Technologies, 9/27 M. Skłodowskiej-Curie Street, 90-570 Lodz, Poland.
Int J Mol Sci. 2024 May 4;25(9):5024. doi: 10.3390/ijms25095024.
This study presents the functionalization of silk fabric with SWCNT ink. The first step was the formation of a polydopamine (PDA) thin coating on the silk fabric to allow for effective bonding of SWCNTs. PDA formation was carried out directly on the fabric by means of polymerization of dopamine in alkali conditions. The Silk/PDA fabric was functionalized with SWCNT ink of different SWCNT concentrations by using the dip-coating method. IR and Raman analyses show that the dominant β-sheet structure of silk fibroin after the functionalization process remains unchanged. The heat resistance is even slightly improved. The hydrophobic silk fabric becomes hydrophilic after functionalization due to the influence of PDA and the surfactant in SWCNT ink. The ink significantly changes the electrical properties of the silk fabric, from insulating to conductive. The volume resistance changes by nine orders of magnitude, from 2.4 × 10 Ω to 2.3 × 10 Ω for 0.12 wt.% of SWCNTs. The surface resistance changes by seven orders of magnitude, from 2.1 × 10 Ω to 2.4 × 10 Ω for 0.17 wt.% of SWCNTs. The volume and surface resistance thresholds are determined to be about 0.05 wt.% and 0.06 wt.%, respectively. The low value of the percolation threshold indicates efficient functionalization, with high-quality ink facilitating the formation of percolation paths through SWCNTs and the influence of the PDA linker.
本研究展示了通过 SWCNT 墨水对丝绸织物的功能化。第一步是在丝绸织物上形成聚多巴胺（PDA）薄涂层，以实现 SWCNT 的有效结合。PDA 的形成是通过在碱性条件下多巴胺聚合直接在织物上进行的。通过使用浸涂法，用不同 SWCNT 浓度的 SWCNT 墨水对 Silk/PDA 织物进行功能化。IR 和 Raman 分析表明，丝素蛋白的主要β-折叠结构在功能化过程后保持不变。由于 PDA 和 SWCNT 墨水中的表面活性剂的影响，疏水性丝绸织物变得亲水。墨水显著改变了丝绸织物的电性能，使丝绸织物从绝缘变为导电。体积电阻变化了九个数量级，从 2.4×10 Ω变为 0.12wt.%SWCNTs 时的 2.3×10 Ω。表面电阻变化了七个数量级，从 2.1×10 Ω变为 0.17wt.%SWCNTs 时的 2.4×10 Ω。体积和表面电阻的阈值分别约为 0.05wt.%和 0.06wt.%。低渗流阈值表明功能化效率高，高质量的墨水有助于 SWCNT 形成渗流路径，并受 PDA 连接体的影响。
