Enhancement of the Fluorescence Quantum Yield of Thiol-Stabilized CdTe Quantum Dots Through Surface Passivation with Sodium Chloride and Bicarbonate
Abstract
Colloidal quantum dots (QDs) have potential for several applications, e.g. as novel light sources; as photoluminescent probes; and for solar energy conversion devices, but their sensitivity towards their environmental surroundings, and the presence of surface defects may still degrade their emission properties. Herein, we present a post-synthetic treatment of CdTe QDs stabilized by mixed thiol ligands using chloride and bicarbonate ions to achieve near-complete surface passivation, resulting in a two-fold increase of the photoluminescence quantum yield (PL QY) and significant suppression of non-radiative recombination. Time-resolved PL measurements reveal fluorescence lifetime and PL QY trends did not both track identically; in the most favorable cases a suppression of non-radiative recombination and a slight increase in the radiative recombination rates after the salt treatment took place. The optimized conditions demonstrated here are proven to work for different sizes of CdTe QDs, and also show a dependence on the composition of the mixed ligand systems used.
Acknowledgements
This work was supported by the Research Grants Council of Hong Kong S.A.R. through the General Research Funds (project CityU 11302114). The authors appreciate numerous discussions and insights into the chemistry and photophysics of CdTe quantum dots from our long term collaborator and friend, Alexander Eychmüller, TU Dresden. Happy 60th anniversary, Alex!
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Preface
- Congratulations to Alexander Eychmüller
- Halogens in the Synthesis of Colloidal Semiconductor Nanocrystals
- Controlled Aqueous Synthesis of CdSe Quantum Dots using Double-Hydrophilic Block Copolymers as Stabilizers
- Fabrication of Ag2S/CdS Heterostructured Nanosheets via Self-Limited Cation Exchange
- Ion-Selective Ligands: How Colloidal Nano- and Micro-Particles Can Introduce New Functionalities
- TEM, FTIR and Electrochemistry Study: Desorption of PVP from Pt Nanocubes
- Incorporation of CdTe Nanocrystals into Metal Oxide Matrices Towards Inorganic Nanocomposite Materials
- Diatoms – A “Green” Way to Biosynthesize Gold-Silica Nanocomposites?
- Evidence for Photo-Switchable Carrier Mobilities in Blends of PbS Nanocrystals and Photochromic Dithienylcyclopentene Derivatives
- Gelation-Assisted Layer-by-Layer Deposition of High Performance Nanocomposites
- Enhancement of the Fluorescence Quantum Yield of Thiol-Stabilized CdTe Quantum Dots Through Surface Passivation with Sodium Chloride and Bicarbonate
- Fluorescence Quenching of CdTe Quantum Dots with Co (III) Complexes via Electrostatic Assembly Formation
- Colloidal Photoluminescent Refractive Index Nanosensor Using Plasmonic Effects
- Towards Low-Toxic Colloidal Quantum Dots
- Color-Enrichment Semiconductor Nanocrystals for Biorhythm-Friendly Backlighting
- Transient Absorption Studies on Nanostructured Materials and Composites: Towards the Development of New Photocatalytic Systems
- Transient Spectroscopy of Glass-Embedded Perovskite Quantum Dots: Novel Structures in an Old Wrapping
- Energy Transfer Between Single Semiconductor Quantum Dots and Organic Dye Molecules
- Chemical Routes to Surface Enhanced Infrared Absorption (SEIRA) Substrates
- Plasmonic Cu/CuCl/Cu2S/Ag and Cu/CuCl/Cu2S/Au Supports with Peroxidase-Like Activity: Insights from Surface Enhanced Raman Spectroscopy
- n-Type Cu2O/α-Fe2O3 Heterojunctions by Electrochemical Deposition: Tuning of Cu2O Thickness for Maximum Photoelectrochemical Performance
- The Photoelectrochemistry of Assemblies of Semiconductor Nanoparticles at Interfaces
- Surface-Charge Dependent Orientation of Water at the Interface of a Gold Electrode: A Cluster Study
- Single Particle Spectroscopy of Radiative Processes in Colloid-to-Film-Coupled Nanoantennas
- Coupled Plasmon Resonances and Gap Modes in Laterally Assembled Gold Nanorod Arrays
- Anisotropy of Structure and Optical Properties of Self-Assembled and Oriented Colloidal CdSe Nanoplatelets
- Simple Electroless Synthesis of Cobalt Nanoparticle Chains, Oriented by Externally Applied Magnetic Fields
- Functionalization of Graphene Aerogels and their Applications in Energy Storage and Conversion
- Macroscopic Aerogels with Retained Nanoscopic Plasmonic Properties
- Application of Aqueous-Based Covalent Crosslinking Strategies to the Formation of Metal Chalcogenide Gels and Aerogels
- Cellulose-Based Hydrogels with Controllable Electrical and Mechanical Properties
- Naphthalenetetracarboxylic Diimide Derivatives: Molecular Structure, Thin Film Properties and Solar Cell Applications
- Metal-Phenolic Encapsulated Mesoporous Silica Nanoparticles for pH-Responsive Drug Delivery and Magnetic Resonance Imaging
- Extraction of K2CO3 from Low Concentration [K+] Solutions with the Aid of CO2: A Study on the Metastable Phase Equilibrium of K2CO3-Na2CO3-H2O Ternary System
Articles in the same Issue
- Frontmatter
- Preface
- Congratulations to Alexander Eychmüller
- Halogens in the Synthesis of Colloidal Semiconductor Nanocrystals
- Controlled Aqueous Synthesis of CdSe Quantum Dots using Double-Hydrophilic Block Copolymers as Stabilizers
- Fabrication of Ag2S/CdS Heterostructured Nanosheets via Self-Limited Cation Exchange
- Ion-Selective Ligands: How Colloidal Nano- and Micro-Particles Can Introduce New Functionalities
- TEM, FTIR and Electrochemistry Study: Desorption of PVP from Pt Nanocubes
- Incorporation of CdTe Nanocrystals into Metal Oxide Matrices Towards Inorganic Nanocomposite Materials
- Diatoms – A “Green” Way to Biosynthesize Gold-Silica Nanocomposites?
- Evidence for Photo-Switchable Carrier Mobilities in Blends of PbS Nanocrystals and Photochromic Dithienylcyclopentene Derivatives
- Gelation-Assisted Layer-by-Layer Deposition of High Performance Nanocomposites
- Enhancement of the Fluorescence Quantum Yield of Thiol-Stabilized CdTe Quantum Dots Through Surface Passivation with Sodium Chloride and Bicarbonate
- Fluorescence Quenching of CdTe Quantum Dots with Co (III) Complexes via Electrostatic Assembly Formation
- Colloidal Photoluminescent Refractive Index Nanosensor Using Plasmonic Effects
- Towards Low-Toxic Colloidal Quantum Dots
- Color-Enrichment Semiconductor Nanocrystals for Biorhythm-Friendly Backlighting
- Transient Absorption Studies on Nanostructured Materials and Composites: Towards the Development of New Photocatalytic Systems
- Transient Spectroscopy of Glass-Embedded Perovskite Quantum Dots: Novel Structures in an Old Wrapping
- Energy Transfer Between Single Semiconductor Quantum Dots and Organic Dye Molecules
- Chemical Routes to Surface Enhanced Infrared Absorption (SEIRA) Substrates
- Plasmonic Cu/CuCl/Cu2S/Ag and Cu/CuCl/Cu2S/Au Supports with Peroxidase-Like Activity: Insights from Surface Enhanced Raman Spectroscopy
- n-Type Cu2O/α-Fe2O3 Heterojunctions by Electrochemical Deposition: Tuning of Cu2O Thickness for Maximum Photoelectrochemical Performance
- The Photoelectrochemistry of Assemblies of Semiconductor Nanoparticles at Interfaces
- Surface-Charge Dependent Orientation of Water at the Interface of a Gold Electrode: A Cluster Study
- Single Particle Spectroscopy of Radiative Processes in Colloid-to-Film-Coupled Nanoantennas
- Coupled Plasmon Resonances and Gap Modes in Laterally Assembled Gold Nanorod Arrays
- Anisotropy of Structure and Optical Properties of Self-Assembled and Oriented Colloidal CdSe Nanoplatelets
- Simple Electroless Synthesis of Cobalt Nanoparticle Chains, Oriented by Externally Applied Magnetic Fields
- Functionalization of Graphene Aerogels and their Applications in Energy Storage and Conversion
- Macroscopic Aerogels with Retained Nanoscopic Plasmonic Properties
- Application of Aqueous-Based Covalent Crosslinking Strategies to the Formation of Metal Chalcogenide Gels and Aerogels
- Cellulose-Based Hydrogels with Controllable Electrical and Mechanical Properties
- Naphthalenetetracarboxylic Diimide Derivatives: Molecular Structure, Thin Film Properties and Solar Cell Applications
- Metal-Phenolic Encapsulated Mesoporous Silica Nanoparticles for pH-Responsive Drug Delivery and Magnetic Resonance Imaging
- Extraction of K2CO3 from Low Concentration [K+] Solutions with the Aid of CO2: A Study on the Metastable Phase Equilibrium of K2CO3-Na2CO3-H2O Ternary System