Maryam Izadifard, PhD Candidate

DEPARTMENT OF CHEMISTRY

CHEMISTRY 601/603

ANALYTICAL/ENVIRONMENTAL SECTION

SPEAKER:            Maryam Izadifard, PhD Candidate

DATE:                     Monday, November 9, 2009

TIME:                      12:00 pm .....PLEASE NOTE TIME CHANGED

PLACE:                  SB 324

TITLE:                    "Dual sensing of oxygen and temperature using quantum dots (QDs) and a ruthenium complex".

ABSTRACT:           

Oxygen measurement is of great importance in industry, medical technology, environmental and analytical sciences. Over the past decade, optical sensors (optrodes) based on the principles of luminescence quenching of a lumophore by oxygen, have been studied as alternatives to currently applied electrochemical sensors. These sensors offer many advantages such as high sensitivity and possibilities of miniaturization and remote sensing, but in spite of these advantages, all luminescence-based sensors suffer from interference from temperature. Therefore optical sensing of oxygen using a luminescent compound is only possible if temperature is known at the measurement site. Temperature measurement can be done in parallel with oxygen sensing using a second luminescent sensor but it is not an easy task.

This study done by Jorge et. al. is concerned with the development of an all optical configuration for simultaneous detection of oxygen and temperature (dual sensing) using a Ru-complex and CdSe-ZnS nanocrystals (QDs) as the luminescent indicators.

This seminar includes:

- an introduction to optical sensing and different sensing approaches

- sensing application of QDs

- a critical review of the chosen paper and

- a current view on the optical oxygen sensors

P.A.S. Jorge, C. Maule. A.J. Silva, R. Benrashid, J.L. Santos, F. Farahi; Dual sensing

of oxygen and temperature using quantum dots (QDs) and a ruthenium complex.

Anal.Chim. Acta (2008) 606, 223-229.