Dual sensing of oxygen and temperature using quantum dots and a ruthenium complex

Abstract

A scheme for the simultaneous determination of oxygen and temperature using quantum dots and a ruthenium complex is demonstrated. The luminescent complex [Ru(II)-tris(4,7-diphenyl-1,10-phenanthroline)]2+ is immobilized in a non-hydrolytic sol-gel matrix and used as the oxygen sensor. The temperature information is provided by the luminescent emission of core-shell CdSe-ZnS semiconductor nanocrystals immobilized in the same material. Measurements of oxygen and temperature could be performed with associated errors of +/-2% of oxygen concentration and +/-1 degrees C, respectively. In addition, it is shown that while the dye luminescence intensity is quenched both by oxygen and temperature, the nanocrystals luminescent emission responds only to temperature. Results presented demonstrate that the combined luminescence response allows the simultaneous assessment of both parameters using a single optical fiber system. In particular, it was shown that a 10% error in the measured oxygen concentration, induced by a change in the sample temperature, could be compensated using the nanocrystals temperature information and a correction function.

Phosphorescent Light–Emitting Iridium Complexes Serve as a Hypoxia-Sensing Probe for Tumor Imaging in Living Animals

“…However, their molecular size enlarges to over 2,000 Da exemplified by the paradium-porphyrin complex (13,14). Ruthenium(II) complex and iridium(III) complex were also used with binding to polymer or quantum dots (12,18). These large probes have been applied to measure oxygen pressure in microcapillary vessels (13,14,16).…”

Determination of Dissolved Oxygen in Water Based on Its Quenching Effect on the Fluorescent Intensity of Bis(2,2′-bipyridine)-5-amino-1,10-phenanthroline Ruthenium Complex

“…Considerable approaches based on the luminescence intensity and decay time have been presented. [12][13][14][15][16][17] The property of fluorophore used for oxygen sensing is a primary factor.…”

Synthesis of 2-{5-[4-((4-nitrophenyl)diazenyl)phenyl]-1,3,4-oxadiazol-2-ylthio}ethyl acrylate monomer and its application in a dual pH and temperature responsive soluble polymeric sensor

“…Recently, dual or multiple stimuli sensors have been reported, that respond simultaneously and independently to different stimuli, such as oxygen and temperature, [17][18][19] oxygen and carbon dioxide, [20,21] oxygen and pH, [22][23][24][25] pressure and temperature, [26] oxygen, temperature and pH, [27] glucose and temperature, [28] pH and temperature, [29][30][31][32][33][34][35][36] and metal ions and temperature. [37] Among these, stimuli-responsive polymers play an important role by changing their structure and physical properties in response to changes in the environment.…”