Luminescent And Oxygen Sensing Properties Of The Transition Metal Ir(Ⅲ) Complex Nanofibers And Ru(Ⅱ) Complex Nanoparticles

Nanomaterials have been widely used in many fielde due to it's excellent performance, especially its performance can be planned. In recent years nano-composite materials is one of the most attractive part of the developed rapidly.Many developed countries regards the development of strategies for the nano-composite materials as important position. But with the new nature, features of organic-inorganic composite nano-light-emitting materials are preferred, because it combines nano-materials and the dual advantages of luminescent materials. In the light-emitting materials, transition metal iridium and ruthenium have been extensively studied, because the transition metal-organic complexes have good light-emitting efficiency, thermal stability, chemical stability and photochemical stability, and many other advantages. In this paper, we got nanospheres of [Ru(Bphen)₂Phen-Si]Cl₂ and Ir(ppy)₂Bphen/PVP nanofibers by nanotechnology at room temperature.We designed and synthesized [Ru(Bphen)₂Phen-Si]Cl₂, it was linked to the surface shell-layer of SiO₂ nanospheres by useing of covalently grafting, then obtained nanocomposites with good dispersion, which have good luminescence and sensing properties. Realized sensing performance optimization by regulating nanospheres'diameter. The excited states of composite materials life have been increased compare with pure complex because the non-radiative transition of complex has been inhibited. we get a good linear relationship between the composite and the concentration of oxygen by testing the oxygen concentration from 0 to 60%. The complex was linked to non-toxic SiO₂ nanospheres surface shell-layer, which make them candidates for monitoring the dissolved oxygen in liquid phase, especially could be used in biological fluids.Luminescent composite nanofibers doped with Ir(ppy)₂Bphen was fabricated by electrospinning technique, using poly(vinylpyrrolidone)(PVP) as precursor. The materials were characterized by fluorescence spectrophotometers,scanning fluorescence lifetimes spectrophotometer and electron microscope(SEM), nanofibers with smooth and less beads and branches were obtained, the average diameter were between 245 and 590nm. We studied the concentration of complex affect on fibers'morphology, diameter and the luminescen intensity, when doping concentration's of complex was 0.20%, Composite materials have the best luminescence intensity, and the excited states of complex life have been increased by fibers.