Systematic Study of the Photoluminescence Dependence of Thiol-Capped CdTe Nanocrystals on the Reaction Conditions
- 27 August 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 109 (37), 17467-17473
- https://doi.org/10.1021/jp044770z
Abstract
A modified method to prepare high-quality thiol-capped CdTe nanocrystals (NCs) was reported in this paper. The experimental results showed that the different molar ratios of the ligands (thioglycolic acid) to monomers (Cd2+ ions) in the precursor solution played an important role in the photoluminescence (PL) quantum yield (QY) of the as-prepared CdTe NCs. When [ligand]/[monomer] = 1.2, the maximum fluorescent emission peak appeared in the orange-red window, and the PL QY increased up to 50% at room temperature without any postpreparative treatment. In the meantime, suitable reaction conditions were in favor of the optimization of the surface structure of NCs, resulting in the relatively high PL QY from green to red. In addition, some differences between hydrothermal synthesis and traditional aqueous synthesis of CdTe NCs were discussed.Keywords
This publication has 41 references indexed in Scilit:
- Hydrothermal Synthesis for High‐Quality CdTe NanocrystalsAdvanced Materials, 2003
- Formation of High Quality InP and InAs Nanocrystals in a Noncoordinating SolventNano Letters, 2002
- Formation of High-Quality CdS and Other II-VI Semiconductor Nanocrystals in Noncoordinating Solvents: Tunable Reactivity of MonomersAngewandte Chemie-International Edition, 2002
- Highly Luminescent Monodisperse CdSe and CdSe/ZnS Nanocrystals Synthesized in a Hexadecylamine−Trioctylphosphine Oxide−Trioctylphospine MixtureNano Letters, 2001
- Self-Assembly of CdSe−ZnS Quantum Dot Bioconjugates Using an Engineered Recombinant ProteinJournal of the American Chemical Society, 2000
- Kinetics of II-VI and III-V Colloidal Semiconductor Nanocrystal Growth: “Focusing” of Size DistributionsJournal of the American Chemical Society, 1998
- Semiconductor Clusters, Nanocrystals, and Quantum DotsScience, 1996
- Double-Layer Superlattice Structure Built Up of Cd32S14(SCH2CH(OH)CH3)36.cntdot.4H2O ClustersJournal of the American Chemical Society, 1995
- X-ray Photoelectron Spectroscopy of CdSe Nanocrystals with Applications to Studies of the Nanocrystal SurfaceThe Journal of Physical Chemistry, 1994
- Measurement of photoluminescence quantum yields. ReviewThe Journal of Physical Chemistry, 1971