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

• A composite was constructed with Fe3O4 core, porous silica shell and Ru-complex.
• This core–shell structure was confirmed and developed for oxygen sensing.
• A dynamic sensing mechanism was found in this composite.
• Sensitivity of 11.5 and short response time of 10 s were obtained.

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.

A composite based on silica molecular sieve MCM-41 and a Ru(II)-based probe was further functionalized with magnetic Fe3O4 so that site-specific guiding could be achieved. Emission monitoring of this composite under various O2 concentrations suggested that its emission was quenchable by O2 with sensitivity of 11.5 and short response time of 10 s.Figure optionsDownload as PowerPoint slide