Study On Preparation Of Multifunctional Conductive Fabric By Magnetron Sputtering Technolegy And Its Stability

Magnetron sputtering technology has incomparable excellent performance compared to other film-forming technologies,such as high deposition speed,low temperature,environmental friendly and other excellent properties.Therefore,this technology has been widely used.However,magnetron sputtering technology has certain choices for the substrate when endow the fabric with special functions,and the stability of the prepared textiles needs to be improved.Therefore,this work combines magnetron sputtering technology with textiles,to make textiles have special properties such as electrical conductivity,electromagnetic shielding performance,antibacterial properties and etc.This method broadens the selection range of the magnetron sputtering technology for the substrate and improves the stability of the functional textile which were prepared by the magnetron sputtering technology.The main content and conclusions in this paper are divided into the following three parts:(1)Ag target was sputtered onto polyester(PET)woven fabrics and polypropylene(PP)nonwoven fabrics by magnetron sputtering technique according to a certain sputtered parameters.And explored the relationships between sputtering power and sputtering speed,film thickness and conductivity and crystal structure.The results show that the rate is more stable at a smaller sputtering power.That is because the interspace of the woven fabric surface is large which caused the surface of the fabric is discontinuous.There is no conductive property of the PET fabric in the thickness range of Ag.The conductivity of the PP nonwoven fabric is proportional to the thickness of the Ag layer,and has a certain crystal structure when the thickness of the Ag layer is up to 10 nm.(2)In order to get the conductive PET fabric,the PET fabric were treated by pretreatment firstly and then the surface of the PET was coated with polyacrylate(PA)by padding method.Then the functionally stable conductive PET fabric was prepared by magnetron sputtering technique by sputtered Ag and Ti in different order and contents onto the surface of the pretreated PET fabric.And then,to explor the influence of the different sputtered structure on conductivity and stability of the treated fabric,the structure of the Ag,Ti/Ag/Ti triple layer and Ti-Ag alloy film were formed by magnetron sputtering technique.Subsequently,the fabric was characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and Fourier transform infrared(FTIR)spectroscopy.The electrical conductivity,contact angle(CA),flexibility and adhesion of the treated fabrics were also tested.Finally,a simple circuit was fabricated with the treated fabric to evaluate the electrical conductivity of the fabric.The results show that a continuous film can be formed by pretreatment.The Ag sputtered PA-coated PET fabric has the resistivity of 1.89 Ω/sq,CA of 135°.The Ti/Ag/Ti sputtered PA-coated PET fabric exhibited excellent electrical conductivity with a resistivity of 5.1 Ω/sq,CA of 137°.The Ti-Ag alloy coated PA coated PET fabric exhibited a lower resistivity of 3.4 Ω/sq,CA of about 130°.In addition,the sample maintains the desired flexibility.Ag and Ti-Ag sputtered fabric have good adhesion,but Ag exhibited poor resistance to vulcanization.This study can achieve the fabric with discontinuous surface conductive,which expands the application range of magnetron sputtering technolegy.And because of the excellent electrical conductivity of the fabrics,it can be a promising smart textile material.(3)Multifunctional conductive and stable PP nonwoven fabric was prepared by a combination method of magnetron sputtering technology and finishing treatment.Based on the result analysis of(2),and the simplify of treatment,we chose Ag as the target,and PP nonwoven fabric as substrate.Firstly,PP nonwoven fabric was sputtered by magnetron sputtering system to form an Ag film on the surface of the fabric.Subsequently,the coated fabric was treated with dopamine.The fabric was characterized by scanning electron microscopy(SEM),energy spectrum analyzer(EDS).And the experiments of the electrical conductivity,electromagnetic interference shielding effect(EMI SE),antibacterial activity,stability,and washing durability were also conducted.The results showed that polydopamine(PDA)particles or films were deposited on the surface of the Ag film after dopamine treatment.Electrical conductivity and EMI SE were different from single Ag-coated samples.But the differences were small.In the experimental range of this subject,the resistivity of the fabric after dopamine treatment was less than 12.6 Ω/sq,and still showed excellent EMI SE of over 25 dB.After the treatment of dopamine,the antibacterial activity of the fabric is enhanced.At the same time,the treated sample exhibited excellent resistance to vulcanization and excellent washing resistance.Therefore,this method is considered to be an effective method for preparing multifunctional,stable and durable fabrics.