Preparation And Properties Of Photoresponsive Fabrics Based On Copper Nanoparticles

The combination of nano-materials and textiles can endow traditional textiles with better performance and more new functions.While improving the properties of textiles,there is usually a problem that the fabric and nanoparticles are not firmly bonded.The nanoparticles loaded on the fabric surface are easy to fall off during the use of the fabric,which leads to the decline of the fabric function.Therefore,it is of great significance to study how to enhance the adhesion between fabrics and nanoparticles.In this paper,the fabric was modified by dopamine,and copper-based nanoparticles were loaded on the fabric to prepare photoresponsive fabric.The main research work includes the following aspects:（1）Using dopamine（PDA）self-polymerization method,CuS@PDA nanoparticles with core-shell structure were prepared,which were attached to the cationic modified cotton fabric by electrostatic adsorption,and the fine cotton fabric was prepared.The cotton fabric of CuS@PDA nanocomposite was characterized bySEM,TEM,XPS,FTIR and XRD.Through a series of photothermal conversion experiments,the photothermal conversion properties of CuS@PDA cotton fabric under near-infrared light（808 nm）irradiation were studied.The effects of irradiation power,irradiation distance and solution concentration on the photothermal properties were investigated,and the cycle conversion experiments were done.The photocatalytic performance of CuS@PDA cotton fabric was studied by photodegradation of methylene blue（MB）aqueous solution.The results showed that the CuS@PDA nanocomposites dispersed well on the surface of cotton fabric without aggregation under scanning electron microscope.The polymerization and coating of dopamine can be seen under transmission electron microscopy.The film of PDA is uniform and lighter in color,while CuS nanoparticles are heavier in color and the thickness of PDA coating is about 5 nm.XPS,XRD and FTIR spectra showed that CuS@PDA nanoparticles were well synthesized.The CuS@PDA cotton fabric can be rapidly increased from room temperature to 70℃in 70s under the irradiation of near infrared light.The results of cyclic conversion experiment show that CuS@PDA cotton fabric has excellent stability in photothermal properties.（2）The PDA load on the surface of the ceramic fiber,and its impregnation in a certain concentration of copper,iron ion mixed solution,impregnation after taking out and NH₃·H₂O full effect after burning to get CuFe₂O₄@PDA ceramic fiber cloth.The microstructure,phase and elemental composition of CuFe₂O₄@PDA ceramic fiber cloth were characterized bySEM,XPS,TG and XRD.The photocatalytic performance of CuFe₂O₄@PDA ceramic fiber cloth was tested.The results showed that CuFe₂O₄ nanoparticles were successfully grown on the ceramic fiber cloth under electron microscopy,and the characteristic peaks and corresponding elements of CuFe₂O₄ found in XRD and XPS spectra further proved that CuFe₂O₄@PDA ceramic fiber cloth was successfully prepared in the experiment.Under visible light,the modified fabric could degrade the MB solution to over 98%in 80 min,and the stability of degradation of MB was still above 90%after 3 cycles.（3）The anionic waterborne polyurethane（WPU）is loaded on the surface of cotton fabric,and the surface of Cu_2-XSe nanoparticles is loaded by hot pressing method to produce Cu_2-XSe@WPU cotton fabric.ThroughSEM,EDS,XPS,TG,FTIR and XRD characterization means of Cu_2-XSe@WPU cotton fabric was analyzed in detail,through the photothermal conversion experiment to explore the impact of irradiation power and irradiation distance on the photothermal properties of the sample cycle conversion experiment and coating temperature change experiment,photothermal conversion thermal imaging was obtained.The results showed that Cu_2-XSe nanoparticles formed a uniformly dispersed film on the surface of cotton fabric under scanning electron microscopy,and the characteristic peaks and corresponding elements of Cu_2-XSe@WPU found in XRD,XPS and FTIR spectra further proved that the composite material had been deposited well on the surface of cotton fabric.The Cu_2-XSe@WPU cotton fabric can be rapidly increased from room temperature to 60℃in 70s under the irradiation of near infrared light.It can be seen from the paint temperature experiment that the photoheat transfer temperature can be transmitted to the opposite side of the fabric.The results of thermal imaging show that the fabric can still realize the photothermal conversion when it is stretched and folded.