From Cd-Rich to Se-Rich − the Manipulation of CdSe Nanocrystal Surface Stoichiometry
- 20 February 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 129 (10), 2841-2848
- https://doi.org/10.1021/ja066205a
Abstract
We report a protocol for manipulating the surface composition of CdSe nanocrystals. By combining the successive ion layer adhesion and reaction (SILAR) method developed by Li et al. J. Am. Chem. Soc. 2003, 125, 12567 with a phosphine-free selenium precursor, the surface stoichiometry of CdSe can be tunably altered from Cd- to Se-rich. By changing the overall surface stoichiometry, we demonstrate ligand binding to specific surface sites. Tertiary phosphines produce a dramatic enhancement in photoluminescence quantum yield of CdSe particles with Se-rich surfaces but have little effect on Cd-rich surfaces. Unpassivated selenium surface sites are also shown to be a cause of the photobrightening behavior of CdSe nanocrystals.This publication has 49 references indexed in Scilit:
- Blinking and Surface Chemistry of Single CdSe NanocrystalsSmall, 2006
- NMR Analysis of Surfaces and Interfaces in 2-nm CdSeJournal of the American Chemical Society, 2004
- Passivation of Si nanocrystals in SiO2: Atomic versus molecular hydrogenApplied Physics Letters, 2003
- Large-Scale Synthesis of Nearly Monodisperse CdSe/CdS Core/Shell Nanocrystals Using Air-Stable Reagents via Successive Ion Layer Adsorption and ReactionJournal of the American Chemical Society, 2003
- Highly Luminescent Monodisperse CdSe and CdSe/ZnS Nanocrystals Synthesized in a Hexadecylamine−Trioctylphosphine Oxide−Trioctylphospine MixtureNano Letters, 2001
- X-ray Photoelectron Spectroscopy of CdSe Nanocrystals with Applications to Studies of the Nanocrystal SurfaceThe Journal of Physical Chemistry, 1994
- Photochemistry and radiation chemistry of semiconductor colloids. 27. Preparation of colloidal lead dioxide and various electron-transfer processesThe Journal of Physical Chemistry, 1989
- Photophysics of quantized colloidal semiconductors. Dramatic luminescence enhancement by binding of simple aminesThe Journal of Physical Chemistry, 1986
- The Role of Energy Levels in Semiconductor‐Electrolyte Solar CellsJournal of the Electrochemical Society, 1978
- Thermodynamic Potential for the Anodic Dissolution of n-Type SemiconductorsJournal of the Electrochemical Society, 1977