Incidence of the core composition on the stability, the ROS production and the toxicity of CdSe quantum dots

2014 ◽  
Vol 268 ◽  
pp. 246-255 ◽  
Author(s):  
Florence-Anaïs Kauffer ◽  
Christophe Merlin ◽  
Lavinia Balan ◽  
Raphaël Schneider
Keyword(s):  
Quantum Dots ◽  
Cdse Quantum Dots ◽  
Ros Production ◽  
The Core ◽  
Core Composition ◽  
The Stability

scholarly journals Resolving the Core and the Surface of CdSe Quantum Dots and Nanoplatelets Using Dynamic Nuclear Polarization Enhanced PASS–PIETA NMR Spectroscopy

2018 ◽  
Vol 4 (9) ◽  
pp. 1113-1125 ◽  
Author(s):  
Laura Piveteau ◽  
Ta-Chung Ong ◽  
Brennan J. Walder ◽  
Dmitry N. Dirin ◽  
Daniele Moscheni ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nmr Spectroscopy ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Cdse Quantum Dots ◽  
The Core

Modification of Blinking Statistics in Solid State Quantum Dot/Conjugated Organic Polymer Composite Nanostructures

2006 ◽  
Vol 959 ◽  
Author(s):  
Nathan I Hammer ◽  
Kevin T Early ◽  
Michael Y Odoi ◽  
Ravisubhash Tangirala ◽  
Kevin Sill ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Quantum Dot ◽  
Single Molecule ◽  
Fluorescence Emission ◽  
Phase Segregation ◽  
Organic Polymer ◽  
Cdse Quantum Dots ◽  
The Stability ◽  
Fluorescence Intermittency

ABSTRACTFluorescence intermittency, or “blinking” in quantum dot systems has been the subject of great interest since the first observation of this phenomenon nearly 10 years ago. The stability of quantum dot fluorescence emission is especially important in the context of photovoltaic, optoelectronic, and biological applications, where device performance, or the ability to track labeled particles, is affected adversely by fluorescence intermittency. Single-molecule spectroscopy combined with atomic force microscopy measurements reveal that CdSe quantum dots functionalized with oligo(phenylene vinylene), OPV, ligands exhibit modified optical properties such as suppression of blinking when compared to conventional TOPO covered or ZnS-capped CdSe quantum dots. The blinking suppression is shown to be highly sensitive to the degree of ligand coverage on the quantum dot surface and this effect is interpreted as resulting from charge transport from photoexcited OPV into vacant trap sites on the quantum dot surface. This direct surface derivatization of quantum dots with organic ligands also enables a “tunable” quantum dot surface that allows dispersion of quantum dots in a variety of polymer supported thin films without phase segregation. This facilitates straightforward inclusion of these new hybrid materials into solid state formats and suggests exciting new applications of composite quantum dot/organic systems in optoelectronic systems.

scholarly journals Controlled size and high stability SiO2@ZnO QD’s with high green emission obtained by a simple colloidal route

2019 ◽  
Author(s):  
Rene Perez Cuapio ◽  
Jose Alberto A G Alvarado Garcia ◽  
Mauricio Pacio Castillo ◽  
Antonio Arce Plaza ◽  
Carlos Bueno Avendaño ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Green Emission ◽  
Morphological Characterization ◽  
The Core ◽  
Ft Ir ◽  
Uv Lamp ◽  
Size And Morphology ◽  
The Stability ◽  
Average Size

In this work the synthesis of visible ZnO quantum dots (QDs) functionalized/stabilized with oleic acid and core-shelled with SiO2 is presented. A colloidal route was followed to synthesize ZnO QDs with 5 nm average size. Several characterizations were done to identify and assure the core, the stabilization, grain size and QDs emission characteristics. Techniques like FT-IR, XRD, TEM, SEM, UV-Vis, PL and an UV lamp were used to test composition, structural, morphological and emission of the as obtained quantum dots. After the structural and morphological characterization of the particles, they were functionalized with (3-aminopropyl) trimethoxysilane (APTMS).  It was observed that the size and morphology are unchanged but the stability depends directly on the APTMS oversaturation which is due to the formation of a thick SiO2 layer. From the PL characterization results it was noticed that the strong green emission is related to the APTMS content and directly related to the shell formation, this emission decreases as the core-shell thickness increases.

Ultrafast fs coherent excitonic dynamics in CdSe quantum dots assemblies addressed and probed by 2D electronic spectroscopy

2021 ◽  
Vol 154 (1) ◽  
pp. 014301
Author(s):  
Elisabetta Collini ◽  
Hugo Gattuso ◽  
R. D. Levine ◽  
F. Remacle
Keyword(s):  
Quantum Dots ◽  
Electronic Spectroscopy ◽  
Cdse Quantum Dots

Armor-Like Passivated CsPbBr3 Quantum Dots: Boosted Stability with Hand-in-Hand Ligands and Enhanced Performance of Nuclear Battery

2021 ◽  
Author(s):  
Haibo Zeng ◽  
Dandan Yang ◽  
Zhiheng Xu ◽  
Chunhui Gong ◽  
Xiaoming Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Inorganic Perovskite ◽  
Surface Ligands ◽  
Perovskite Quantum Dots ◽  
Stability Issue ◽  
The Stability ◽  
Nuclear Battery ◽  
Cspbbr3 Quantum Dots

One of the main reasons for the stability issue of inorganic perovskite quantum dots (PQDs) is the fragile protection of surface ligands. Here, an armor-like passivation strategy is proposed to...

scholarly journals One pot synthesis of bi-linker stabilised CdSe quantum dots

2010 ◽  
Vol 245 ◽  
pp. 012067 ◽  
Author(s):  
I Concina ◽  
M M Natile ◽  
A Braga ◽  
A Vomiero ◽  
V Morandi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdse Quantum Dots ◽  
One Pot ◽  
One Pot Synthesis

Measuring temperature heterogeneities during solar-photothermal heating using quantum dot nanothermometry

The Analyst ◽  
2021 ◽  
Author(s):  
Stephanie K. Loeb ◽  
Haoran Wei ◽  
Jae-Hong Kim
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Fluorescence Emission ◽  
Emission Wavelength ◽  
Wavelength Shift ◽  
Cdse Quantum Dots ◽  
Photothermal Heating

The fluorescence emission wavelength shift of CdSe quantum dots due to heat-induced lattice dilatation is used to spatially resolve temperatures in solar photothermal systems.

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