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Surface Derivatization of Nanocrystalline CdSe Semiconductors

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Abstract

CdSe quantum dots (QDs) with several different ligands were prepared by ligand exchange reactions of trioctylphosphine oxide (TOPO)/trioctylphosphine selenide (TOPSe) passivated QDs with an excess of new ligands, such as pyridine, 4-picoline, thiophenol, 4-(trifluoromethyl)-thiophenol, and tris(2-ethylhexyl)phosphate. We find that 85~90% of ligands passivating the surface of the QDs are the newly introduced capping species and 10~15% are native TOPO/TOPSe ligands, reflecting the incomplete exchange of the QD surface. Thermal gravimetric analysis (TGA) and quantitative proton NMR measurements show that on average only 30% of surface cadmium atoms are passivated by TOPO/TOPSe. Approximately 1/3 of these native ligands occupy sites too strongly bound to be replaced by ligand exchange reactions.

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Authors and Affiliations

  1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    J.-K. Lee, M. Kuno & M. G. Bawendi

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  1. J.-K. Lee
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  2. M. Kuno
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  3. M. G. Bawendi
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Lee, JK., Kuno, M. & Bawendi, M.G. Surface Derivatization of Nanocrystalline CdSe Semiconductors. MRS Online Proceedings Library 452, 323–328 (1996). https://doi.org/10.1557/PROC-452-323

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  • DOI: https://doi.org/10.1557/PROC-452-323

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