title: 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.
authors: Unidade de Optoelectrónica e Sistemas Electrónicos, INESC Porto, Rua do Campo Alegre, 687, 4169 007 Porto, Portugal. pjorge@inescporto.pt
authors: P A S
authors: PA
authors: Jorge
authors: C
authors: C
authors: Maule
authors: A J
authors: AJ
authors: Silva
authors: R
authors: R
authors: Benrashid
authors: J L
authors: JL
authors: Santos
authors: F
authors: F
authors: Farahi
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D002138:Calibration; D005240:Feasibility Studies; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D053758:Nanoparticles / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D010316:Particle Size; D010618:Phenanthrolines / Q000737:chemistry*; D045663:Quantum Dots; D012044:Regression Analysis; D015203:Reproducibility of Results; D018036:Selenium Compounds / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry; D013696:Temperature; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D049408:Luminescent Agents; D009942:Organometallic Compounds; D010618:Phenanthrolines; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; C041132:tris(4,7-diphenyl-1,10-phenanthroline)ruthenium (II); C058667:cadmium selenide; C031238:zinc sulfide; D010100:Oxygen