Preparation Of Hydrophilic Molybdenum Oxide Quantum Dots And Its Multifunctional Application On Textiles

Functional textiles have great application value in military aviation,transportation,and medical care.However,with the high pursuit of health living,single-function textiles cannot meet the current market demand.Therefore,how to develop multifunctional textiles has become a hot topic of research in the industrial field.Nanomaterials have been widely applied in biomedicine,energy,environment,and precision optics because of their unique microstructure,excellent physical and chemical properties.Among them,MoO_3-x QDs have the advantages of easy preparation,low cost,high biocompatibility,and chemical stability,making it possible to prepare multifunctional textiles.In this paper,MoO_3-x QDs were prepared through UV-irradiation and combined with polyester fabric via finishing,enabling the finished fabric with multiple applications such as antistatic,smoke suppression,antibacterial.On this basis,MXene（Ti₃C₂T_x）and MoO_3-xQDs heterojunction composites were further constructed to prepare smart textiles with the function of fire warning,which provided a feasible idea for multifunctional development of nanomaterials on textiles.The specific research content and results are as follows:（1）MoO_3-x QDs were prepared successfully by UV-irradiation and aqueous phase synthesis.Subsequently,the morphology,structure,and composition of MoO_3-x QDs were observed by means of XRD,TEM,FT-IR,XPS,UV-vis.Impressively,the results show that the MoO_3-x QDs prepared by UV-irradiation are smaller and more uniform.The MoO_3-x QDs are the mixed-valence,and their surface is modified by PVP.Besides,the MoO_3-x QDs show a strong local plasma surface resonance effect.On this basis,the synthesis process of MoO_3-x QDs was optimized by orthogonal experiment,which took the electrostatic half-period as an evaluation index.（2）Through the traditional padding-drying-baking process,MoO_3-x QDs were loaded on polyester fabric to obtain multifunctional textile with antistatic,smoke suppression and antibacterial properties.Under the control of the single factor with MoO_3-x QDs concentration,pick-up,baking temperature,baking time,adhesive type and adhesive concentration,the electrostatic half-period of fabric was effectively reduced,and the washing resistance was improved.Overall,the finished fabric shows excellent antistatic,smoke suppression and antibacterial properties.The electrostatic half-period of finished fabric was as low as 1.13 s,reaching A-grade antistatic standard.Equally,the finished fabric released 36.74%less smoke during the combustion process and the sterilization rate of E.Coli and S.aureus was as high as 99%when under light conditions.In addition,the functional finishing process did not have a major impact on strength,air permeability and moisture permeability,which can still ensure the comfort of the fabric.（3）2D material MXene（Ti₃C₂T_x）was successfully obtained by etching MAX phase Ti₃Al C₂ with HCl/Li F.Due to the negative charge characteristics of MXene,the heterostructure was formed by electrostatic self-assembly with MoO_3-x QDs.Then,the MXene/MoO_3-x QDs were loaded on cotton knitted fabric.MXene/MoO_3-x QDs@CF has excellent temperature monitoring capability.In the range of 30-180℃,the output voltage is almost linear with temperature,and the sensitivity is as high as-0.26%/℃.At the same time,it can respond quickly within 2.77 s,detect the temperature change of 0.5℃at the lowest,and have good cycle stability and repeatability.Under external factors,MXene/MoO_3-xQDS@CF can resist strain and humidity interference when simulating actual fire conditions.MXene/MoO_3-x QDs@CF still showed fire alarm ability after three cycles.In addition,MXene/MoO_3-x QDs@CF can be sensitive to changes in the temperature of the environment.