Abstract
Abstract This effort focused on a site-specific composite sample with core-shell structure for oxygen sensing purpose, using Fe 3 O 4 particles as magnetic core, silica molecular sieve MCM-41 as supporting shell and a Ru(II)-based complex having large conjugation planes as sensing probe, respectively. These rigid conjugation planes were supposed to broaden electronic distribution of excited electrons and increase their decay lifetime, so that their sensing collision probability with O 2 molecules could be improved, favoring oxygen sensing. This core-shell composite structure was characterized by electron microscope images, XRD patterns, IR spectra, N 2 adsorption/desorption and thermal analysis. Photophysical analysis indicated that its emission was quenchable by O 2 following a dynamic sensing mechanism. This composite structure gave a high sensitivity of 15.05 with response time of only 8 s. Good stability and, more importantly, linear response were obtained, which was attributed to the covalent grafting between sensing probe and supporting matrix.
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