Modifying a composite based on silica molecular sieve and a Ru(II)-based probe with Fe3O4 particles: Construction and oxygen sensing performance

Article abstract of DOI:10.1016/j.ica.2016.02.061

This paper reported a composite based on silica molecular sieve MCM-41 and a Ru(II)-based probe which was further functionalized with magnetic Fe₃O₄ so that site-specific guiding could be achieved. A core–shell structure was applied in this composite, with Fe₃O₄ as core and MCM-41 as shell, respectively. By means of electron microscope images, XRD analysis, IR spectra, N₂ adsorption/desorption measurement and thermal degradation analysis, this composite was analyzed and confirmed. Emission monitoring of this composite under various O₂ concentrations suggested that its emission was quenchable by O₂ through a dynamic mechanism with good stability. Sensitivity of 11.5 and short response time of 10 s were obtained with a linear working plot.