Wu Fan, Shi Haoyu, Gao Yulong, Cheng Lin, Gu Tongkai, Liu Tong, Chen Ziyun, Fan Wei
School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.
Key Laboratory of Functional Textile Material and Product of Ministry of Education, Xi'an Polytechnic University, Xi'an, 710048, China.
Sci Rep. 2024 Nov 25;14(1):29219. doi: 10.1038/s41598-024-80655-0.
Nanometal-based composite fibers have been widely explored in flexible sensors due to their outstanding optical and electrical properties. However, the weak binding force between metallic nanomaterial and fiber greatly limits the real application. In this work, nano silver (Ag) are strongly bonded with poly(3,4-ethylenedioxythiophene)-poly (styrene sulfonate) (PEDOT: PSS) fiber by the wet-spun process. Ag-S chemical bonds are formed by the interaction of Ag and PEDOT. The Ag/PEDOT: PSS composite fiber shows excellent surface-enhanced Raman scattering (SERS) sensitivity on Rhodamine 6G (R6G) molecules. The detection limit can reach 10 M and Raman enhancement factor (EF) is of 1.3 × 10. The high-sensitive SERS activity of Ag/PEDOT: PSS composite fiber mainly results from PEDOT: PSS, and the enhancement factor is 3 orders of magnitude better than that of other PEDOT: PSS based SERS substrates. Moreover, the composite fiber has metal-level conductivity of 1019 S/cm. This is 5 times higher than the conductivity of PEDOT: PSS fiber and a two-fold improvement over the reported values for nanometal/PEDOT: PSS based fabrics. The composite fiber has electric stability under bending test with bending speeds of 2 Hz indicating the composite fiber has good structural stability. In addition, the temperature of the composite fiber with 7 cm length can reach 76.5 °C at a voltage of 18 V. Additionally, the composite fiber shows anti-bacterial property and melting drop resistance, which pave the way for the integration of fiber-based optical and electrical sensors in the future multifunctional flexible devices.
基于纳米金属的复合纤维因其出色的光学和电学性能，在柔性传感器领域得到了广泛研究。然而，金属纳米材料与纤维之间的弱结合力极大地限制了其实际应用。在本研究中，通过湿纺工艺使纳米银（Ag）与聚（3,4 - 乙烯二氧噻吩）- 聚（苯乙烯磺酸盐）（PEDOT:PSS）纤维牢固结合。Ag与PEDOT相互作用形成了Ag - S化学键。Ag/PEDOT:PSS复合纤维对罗丹明6G（R6G）分子表现出优异的表面增强拉曼散射（SERS）灵敏度。检测限可达10⁻¹¹ M，拉曼增强因子（EF）为1.3×10⁵。Ag/PEDOT:PSS复合纤维的高灵敏SERS活性主要源于PEDOT:PSS，其增强因子比其他基于PEDOT:PSS的SERS基底高出3个数量级。此外，复合纤维具有10¹⁹ S/cm的金属级电导率。这比PEDOT:PSS纤维的电导率高5倍，比报道的基于纳米金属/PEDOT:PSS的织物的值提高了两倍。复合纤维在2 Hz弯曲速度的弯曲测试下具有电稳定性，表明其具有良好的结构稳定性。此外，长度为7 cm的复合纤维在18 V电压下温度可达到76.5 °C。此外，复合纤维还具有抗菌性能和抗熔滴性能，为未来多功能柔性器件中基于纤维的光学和电学传感器的集成铺平了道路。
