ENHANCEMENT OF OPTICAL OXYGEN SENSING PROPERTIES OF [RU(BPY)3]2+- BASED COMPOSITES ALONG WITH MAGHEMITE AND IONIC LIQUID

Sibel Oğuzlar¹ , MERVE ZEYREK ONGUN²

In this study, we measured oxygen-induced emission and decay-time data of tris(2,2'-bipyridyl)ruthenium(II) chloride dye in the presence of additives, maghemite and ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate. The fluorescent dye along with the additives was embedded in ethylcellulose matrix that was used as supporting material in form of thin-film and electrospun mat. The synthesized maghemite was used to enhance the oxygen sensitivity and linear working range of the dye. Ionic liquid (IL) was used to increase the stability and sensitivity of the sensing fluorophore. Together with the additives ruthenium dye-based composites exhibited higher Stern-Volmer constant (KSV), relative signal change and larger linear response. High relative signal change and KSV values mean that fluorophore has a better oxygen gas sensitivity.Stern-Volmer values of thin-film and microporous mats were found 1.64×10-2 and 2.21×10-2, the relative signal changes (I0/I) were calculated as 2.64 and 3.21, respectively. There is no previous work about the utilization of both maghemite and ionic liquid additives together for the enhancement of oxygen sensitivity of the ruthenium.

Keywords
Ruthenium Complex, Oxygen Sensor, Ionic Liquid, Maghemite, Fluorescence,