Preparation and characterization of a site-specific oxygen monitoring material based on a magnetic–emissive hybrid composite modified with Ru(II) complex

• A core–shell structured nanocomposite was constructed for O2 sensing.
• Fe3O4 and MCM-41 were used as the inner core and the outer shell, respectively.
• A Ru(II) complex was modified and attached to MCM-41 tunnels.
• Emission of this composite decreased with increasing O2 concentrations.
• Sensitivity of 11.6 and response time of 21 s were obtained.

In this paper, a magnetic–emissive hybrid composite modified with Ru(II) complex was constructed aiming at site-specific oxygen sensing. Core–shell structure was applied in this composite with superparamagnetic Fe3O4 as inner core and silica molecular sieve MCM-41 as outer shell, respectively. A silane coupling ligand N-(5H-cyclopenta[1,2-b:5,4-b′]dipyridin-5-ylidene)-3-(triethoxysilyl)propan-1-amine (CDO-Si) and its corresponding Ru(II) complex were covalently connected into MCM-41 shell, acting as sensing probe. This composite was characterized and confirmed by SEM, TEM, XRD, IR, TGA and N2 adsorption/desorption. Its emission response to molecular O2 was investigated. It was found that composite emission decreased with increasing O2 concentrations, showing sensitivity of 11.6 and response time of 21 s.

A core–shell structured nanocomposite for O2 sensing was reported, using superparamagnetic ferroferric oxide and silica molecular sieve MCM-41 as the inner core and the outer shell, respectively. Composite emission decreased with increasing O2 concentrations, showing sensitivity of 11.6 and response time of 21 s.Figure optionsDownload as PowerPoint slide