Surface modification of lead sulfide nanocrystals with poly(acrylic acid) through a ligand exchange process.
Published: 2007
Language: eng
Number of pages: 71
ISBN-13: 9780494274392
Description: Lead sulfide (PbS) QDs absorb and emit light in the near-infrared region, making them potentially useful for telecommunication and biotechnological application. The PbS QDs with the highest photoluminescence quantum efficiency (PLQE) are normally prepared by an organometallic route. QDs as prepared are capped with oleic acid (OA) on their surface and not soluble in polar solvents. The challenge to transfer the QDs into polar solvents is overcome by a ligand exchange process after synthesis.My work shows that poly(acrylic acid) (PAA) can substitute the OA on the surface of the PbS QDs and transfer the QDs into polar solvents like methanol and water. PAA was synthesized by RAFT polymerization. The ligand exchange process was studied by various techniques including solubility tests, transmission electron microscopy, dynamic light scattering, and absorption and emission spectroscopy. I also explored the effects of pH on the absorption and emission of QDs in water.
Notes: Source: Masters Abstracts International, Volume: 45-06, page: 3168.

Thesis (M.Sc.)--University of Toronto, 2007.

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