Construction And Performance Of Multifunctional Flexible Conductive Fabrics Based On Metal Nanoparticles

The potential applications of smart textiles in body temperature management,wearable monitoring for human motions,and medical care are receiving more and more attention.However,the inherent hydrophilicity of textiles causes textiles to be easily contaminated,which brings a lot of inconvenience to actual use.At the same time,flexible wearable textiles are vulnerable to mechanical and microbial attacks in actual use,such as sweating,abrasion,bending,and bacterial cross-infection.Therefore,there is still a big challenge to prepare multifunctional electronic textiles with waterproof,electrothermal response,mechanical sensitivity and antibacterial properties.In this work,the research on progress of multifunctional electronic textiles were reviewed and analyzed in details.The flexible,breathable and elastic knitted cotton fabric is used as the substrates,and metal nanoparticles are used as conductive materials and nanostructure units.In-situ reduction and electroless deposition were carried out at room temperature to construct conductive nanostructures on the surface of micron-level fibers,and then the fabric were hydrophobized to prepare super-hydrophobic conductive cotton fabric.This work was mainly launched the following three aspects of research:(1)The elastic knitted cotton fabric was used as the substrate,and coated with tannin acid(TA)at room temperature,and then nano-silver particles were grown on the surface of the modified cotton fabric by the in-situ reduction method.Then the surface was hydrophobized by PDMS to prepare a superhydrophobic conductive fabric(Cotton/TA/Ag NPs/PDMS)based on nano-silver particles.The surface morphology,chemical composition and structure were characterized by scanning electron microscope(SEM),X-ray diffraction spectroscopy(XRD),X-ray photoelectron spectroscopy(XPS)and other testing methods.The hydrophobicity was characterized by a contact angle meter.The effects of different PDMS concentrations on hydrophobicity and conductivity were explored,and the strain sensing,Joule heating and antibacterial properties of the prepared conductive fabrics and the stability of the above properties were explored.The results showed that the prepared multifunctional conductive fabric can reach a higher equilibrium temperature(118.7°C)at a lower working voltage(2V).The conductive cotton fabric exhibits excellent and sensitive strain sensing performance,cycle stability and excellent electric heating performance and excellent antibacterial properties which could be used for real-time monitoring of large deformation and micro movements of the human body.(2)The elastic knitted cotton fabric was used as the substrate,the lysozyme self-assembly(PTL)coating method was used to modify the fabric surface,and nano silver particles were grown on the surface of the modified cotton fabric via electroless deposition at room temperature.the surface was hydrophobized by PDMS to prepare a superhydrophobic conductive fabric based on nano silver particles(Cotton/PTL/Ag NPs/PDMS).The surface morphology,the chemical composition and structure were characterized by Scanning Electron Microscope(SEM),Fourier Infrared Spectroscopy(FTIR),X-ray Diffraction Spectroscopy(XRD),X-ray Photoelectron Spectroscopy(XPS),Thermogravimetric Analyzer(TG)and other instruments.The contact angle of water droplets on the surface of the fabric was measured with a optical contact angle tester,the resistivity of the modified fabric was tested with a multifunctional multimeter,and the sensing performance of the modified fabric was measured by the chrono-resistance method.To explore the Joule heating performance,the thermal imaging camera was used to characterize the Joule heating performance of the conductive fabric,and the Aglilent N5230 vector network analyzer was used to characterize the electromagnetic shielding performance of the conductive fabric.The effect of different electroless deposition time on the conductivity of Cotton/PTL/Ag NPs/PDMS was studied,and the effect of PDMS concentration and coating time on the hydrophobicity of cotton fabrics was also explored.The super-hydrophobic stability and electrical conductivity of the modified cotton fabric were evaluated by mechanical friction,immersion in acid-base solutions and cyclic stretching.The results showed that the prepared conductive fabric has excellent heating performance and deicing performance.After repeated bending and abrasion,the electrical conductivity and superhydrophobic properties of the fabric did not change significantly.In addition,the prepared multifunctional cotton fabric exhibited excellent strain sensing performance and showed excellent antibacterial activity in potential human motion monitoring.(3)The elastic knitted cotton fabric was used as the substrate,lysozyme self-assembly(PTL)coating method was used for surface modification.copper sulfate was used as the raw material,and palladium catalyzed the electroless deposition at room temperature to grow Nano-copper particles on the surface of the modified cotton fabric that was hydrophobized by PDMS to prepare a superhydrophobic conductive fabric(Cotton/PLA/Cu NPs/PDMS)based on copper particle nanoparticles.The surface morphology,composition and structure were characterized by scanning electron microscope(SEM),X-ray diffraction spectroscopy(XRD)and other instruments.The resistivity of the modified fabric was tested with a multi-function multimeter,and the chrono-resistance method was used to measure the resistivity of the modified fabric.The sensing performance of the modified fabric was explored,and the Joule heating performance of the conductive fabric was characterized by an infrared thermal imager.The results showed that the prepared conductive fabric has excellent heating performance.In addition,the prepared cotton fabric exhibited excellent strain sensing performance in potential human motion monitoring.