Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Colloidal PbS Quantum Dots (QDs) are suitable for near infrared applications like bio-imaging, photovoltaics, light detection and emission due to their remarkable sensitivity in long-wavelength region. They have been successfully applied in active layers of solar cells, in LEDs as well as in live-cell imaging. Determining QDs optical properties by controlling their size and shape is crucial for introducing them in practical devices.
We proposed a new synthetic approach to high quality PbS QDs using thioacetamide (TAA) as a sulfur precursor [1]. The synthesis essentially involves the injection of TAA in methanol to mixture of lead oleate, oleic acid and 1-octadecene. Depends on the temperature at which injection was made (24-32oC) the different rate of nucleation and followed QDs growth were observed. We investigated various synthesis temperatures and precursors ratio in order to evaluate the parameters at which monodisperse QDs are synthetized. At optimum conditions 110 meV of the absorption peak FWHM was determined.
In a second step, we investigated a method of controlling PbS quantum dots diameter by manipulating the solute solubility. This route was previously reported for CdSe nanocrystals [2] and we extended it to PbS QDs operating in infrared region. The influence of changing free acid concentration in synthesis solution on nanocrystals diameter had been examined. We obtained particles with sizes ranging from about 3 to 6 nm with corresponding change in acid concentration by the factor of 4. Finally, we compared QDs sizes measured by Transmission Electron Microscope with sizes calculated from absorbance spectra. Furthermore, we analyzed photoluminescence properties of synthesized PbS nanocrystals.
[1] M. Banski, H. Woznica, I. Guzik, J. Misiewicz, A. Podhorodecki, Warm injection of thioacetamide in the synthesis of PbS nanocrystals, submitted
[2] S. Abe, R. K. Capek, B. De Geyter, Z. Hens, Reaction Chemistry/Nanocrystal Property Relations in the Hot Injection Synthesis, the Role of the Solute Solubility, ACS Nano, 2013, 7 (2), pp 943–949
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