Shell Thickness Modulation in Ultrasmall CdSe/CdSxSe1–x/CdS Core/Shell Quantum Dots via 1-Thioglycerol
- 27 January 2014
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 8 (2) , 1913-1922
Abstract
In this study, we report on the synthesis of CdSe/CdS core–shell ultrasmall quantum dots (CS-USQDs) using an aqueous-based wet chemistry protocol. The proposed chemical route uses increasing concentration of 1-thioglycerol to grow the CdS shell on top of the as-precipitated CdSe core in a controllable way. We found that lower concentration of 1-thioglycerol (3 mmol) added into the reaction medium limits the growth of the CdSe core, and higher and increasing concentration (5–11 mmol) of 1-thioglycerol promotes the growth of CdS shell on top of the CdSe core in a very controllable way, with an increase from 0.50 to 1.25 nm in shell thickness. The growth of CS-USQDs of CdSe/CdS was confirmed by using different experimental techniques, such as optical absorption (OA) spectroscopy, fluorescence spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and Raman spectroscopy. Data collected from OA were used to obtain the average values of the CdSe core diameter, whereas Raman data were used to assess the average values of the CdSe core diameter and CdS shell thicknesses.Keywords
This publication has 65 references indexed in Scilit:
- One-pot aqueous-phase synthesis of ultra-small CdSe/CdS/CdZnS core–shell–shell quantum dots with high-luminescent efficiency and good stabilityJournal of Nanoparticle Research, 2013
- Low-Temperature Synthesis and Characterisation of Ultra-Small Cadmium Selenide Quantum Dots in Octadecene SolutionEnergy Procedia, 2012
- Magic sized ZnS quantum dots as a highly sensitive and selective fluorescence sensor probe for Ag+ionsThe Analyst, 2011
- Photovoltaic Performance of Ultrasmall PbSe Quantum DotsACS Nano, 2011
- Influence of Complex-Formation Equilibria on the Temporal Persistence of Cysteinate-Functionalized CdSe Nanocrystals in WaterChemistry of Materials, 2011
- “Yellow emitting” magic-size cadmium selenide nanocrystals via a simplified spray pyrolysis methodCurrent Applied Physics, 2011
- Aqueous synthesis of luminescent magic sized CdSe nanoclustersMaterials Letters, 2008
- Mild synthesis of ultra-small CdSe quantum dots in ethylenediamine solutionMaterials Letters, 2005
- Investigation of the Crystallization Process in 2 nm CdSe Quantum DotsJournal of the American Chemical Society, 2005
- Molecular Limit of a Bulk Semiconductor: Size Dependence of the “Band Gap” in CdSe Cluster MoleculesJournal of the American Chemical Society, 2000