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CdSe@CdS Core-Shell Quantum Dots for Radiation Detection and Dosimetry

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E Guidelli

E Guidelli1,2*, L da Silva Franca2, Y Shen1 , L Oliveira2 , O Baffa2 , K Jensen1 , (1) Massachusetts Institute of Technology, Cambridge, Massachusetts, (2) University of Sao Paulo, Ribeirao Preto, Sao Paulo


SU-I-GPD-T-529 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: Core-shell Quantum dots stand out as a promising tool for radiation detection and dosimetry due to their scintillation properties as well as the ability to tune the emission bands by varying core size and/or shell thickness. This work focuses on the synthesis and characterization of CdSe@CdS quantum dots incorporated in a polymer matrix for application in radiation detection and dosimetry by radioluminescence/scintillation.

Methods: We have synthesized CdSe@CdS core-shell quantum dots with different shell thicknesses and incorporated them into a polymer matrix to produce volumetric dosimeters. Samples were characterized by UV-Vis and photoluminescence spectroscopy and Transmission Electron Microscopy. The dosimetric properties were investigated by means of radioluminescence measurements.

Results: Photoluminescence measurements confirmed successful incorporation of CdSe@CdS core-shell quantum dots with different shell thicknesses without aggregation and luminescence quenching. Preliminary results have shown that when exposed to x-ray beams, luminescence from the exciton emission can be detected. More experiments are in progress to investigate the influence of shell thickness on the radioluminescence properties as well as a full dosimetric characterization of these quantum-dot/polymer composites.

Conclusion: Successful incorporation of the CdSe@CdS core-shell quantum dots into a polymer matrix has allowed for detection of radioluminescence from volumetric dosimeters, revealing these quantum dot/Polymer composites as potential candidates for real-time 3D dosimetry applications.

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