Synthesis Of High Refractive Index La3 Doped Batio3 Nanoparticles For Retroreflective Application Via Water Assisted Solid State Reaction

To guarantee the safe and well-organized movement of traffic on highway during bad weatherrnand nighttime conditions, traffic signs, markings, helmet and safety textile paints have to bernilluminated and made of retro-reflective materials. Materials having collective fluorescent andrnretro-reflective properties importantly improve visibility. For production of these materialsrnCeramics of glass having high refractive index are used. rnMost ceramic materials for different applications are synthesized by a conventional solid staternreaction (SSR) method. In solid state reaction ionic diffusion in an ionic crystal is very sluggishrnat about room temperature Therefore it needs a high temperature conditions for boosting thernreactivity between raw materials. Liquid phase reaction also can arise at relatively lowrntemperature to SSR but needs additional temperature to dry the solvent and superior equipmentrnfor separation. Methods currently used to synthesis glass beads such as Container less flamespray, ConventionalrnSSR, Molten salt etc.rnrequires highrntemperaturern (780 ºC-1300ºC) tornrnsynthesize high purity glassrnbeads.rnFurthermore, products obtained using thesernmethods havernrnlargernbead/ powder sizes. rn activated BaTiO3 atrn100ºc. The starting materials, La2O3, TiO2, and Ba(OH)2.8H2O, weighed according to thernstoichiometric ratio and mixed for 15 minutes with 8% of deionized water, Store in an automaticrnOven for 6 hours at 100ºc. The La doping level were 0%, 5% and 10%. rnIn this study, a WASSR route is employed to synthesize nano-sized Larn3+rn X-ray diffraction of the as prepared new material confirmed the product has a structure ofrnTetragonal BaTiO3 having a size ranging from 19.39 to 21.64nm.EDS mapping of the asrnprepared sample showed uniform distribution of components. From UV-Vi spectrometry, thernLarn3+rn activated BaTiO3 nanoparticles has shown a refractive index of 3.392 when La doping wasrn1%. Raman spectroscopy also confirmed the structure of the as prepared sample is Tetragonal.rnThe refractive index of nanoparticles greatly increased the wide wavelength range (426–900rnnm), which is very useful for some special surfaces that require illumination from reflection ofrnlight rays, such as protective reflective helmet or clothes, road side signs, etc. In addition, it canrnbe used as heat reflective layer, which solves the urban heat island effect.

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