Synthesis Of N-doped ZnO Nanocrystals And Their Properties Of Ultraviolet Prevention And Antimicrobial

Recently, much attention has been focused on the modification of nanocrystallite metal oxide by doping or substituting with special atom. With such modification, it is possible to improve the electrical and optical properties of materials by changing the surface properties, such as electronic band gap, O vacancies, crystal deficiencies and specific surface area (SSA).In the paper, N-doped ZnO (ZNO) nanocrystalline were synthesized by deflagration method using urea as main fuel, surfactant as assistant fuel and zinc nitrate as oxidant. The variation of adiabatic flame temperature (Tad) with the various fuel-to-oxidizer molar ratios value was calculated theoretically according to the thermodynamic concept. The effects of environment temperature, molar ratio of urea-to-zinc nitrate and combustion time on the properties of nanopowder were investigated. XRD, FTIR, SEM, TEM and XPS were used to characterize the properties of the as-synthesized samples. The ultraviolet prevention and antimicrobial properties on cotton fabrics treated by N-doped nano-ZnO were studied.The main research work and results are as follows:(1) During preparing N-doped nano-ZnO, The action of urea not only offered the energy, but also was the source of nitrogen. The effective inhibition effect between crystallites was realized by the expansion effect of gas released by urea. The combustion is a simplification of multi-procedures, such as traditional preparation, aging, dryinh, calcinating processes and rubbing. The N-doped ZnO (ZNO) nanocrystalline with excellent performance were synthesized by this method.(2) The variation of adiabatic flame temperature (Tad) with the various fuel-to-oxidizer molar ratios value was calculated theoretically according to the thermodynamic concept. The experimental results show that perfect pink powders with standard cubic ZnO crystal phase are obtained under 800℃when the urea-to-zinc nitrate molar ratio is 4.920 and the concentration of the zinc nitrate is 60g/L.The average primary granularity of the as-synthsized sample is about 30 nm estimated according to Scherrer Equation. The analysises of XPS indicates that the concentrantion of N-doped in the sample is 1.02%.(3) In this paper, well-dispersed N-doped ZnO (ZNO) nanocrystalline slurry in water medium with high concentration was prepared through the coordination action using silane coupling agent and multi-hydroxy compound. The results reveal that the N-doped ZnO (ZNO) nanocrystalline modified by multi-hydroxy compound in advance has strong combination ability with silane couple agent. Modified N-doped ZnO (ZNO) nanocrystalline has small size, even distribution and well-disperse stability.(4) UPF test results indicate the perfect ultraviolet prevention, A high washing fastness is also attained. The index of UPF is from 4.5 to 52.(5) The antibacterium-circle test indicate the broad-spectrum antibacterial activities. Specially, the antibacterial activities are very good even without light irradiation.In this paper, the N-doped ZnO (ZNO) nanocrystalline with excellent performance were synthesized by combustion for the first time. The combustion is a simplification of multi-procedures, such as traditional preparation, aging, drying, calcinating processes and rubbing. Moreover, the systemic research about the antibacterium and ultraviolet prevention of the N-doped ZnO on textile was for the first. The excellent antibacterium and ultraviolet prevention properties will make N-doped ZnO nanocrystallites become a replaceable and cheap functional agent for textile.