A convenient synthesis of cadmium chalcogenide quantum dots from cadmium acetate and bis(diphenylphosphino)methane monosulfide and –selenide or 1,4-bis(diphenylphosphino)butane monoselenide

2016 ◽  
Vol 191 (5) ◽  
pp. 800-802
Author(s):  
J. W. Faller ◽  
Jonathan Parr
Keyword(s):  
Quantum Dots ◽  
Cadmium Acetate ◽  
Convenient Synthesis ◽  
Cadmium Chalcogenide

Formation and Stepwise Self-Assembly of Cadmium Chalcogenide Nanocrystals to Colloidal Supra-Quantum Dots and the Superlattices

2016 ◽  
Vol 28 (15) ◽  
pp. 5329-5335 ◽  
Author(s):  
Juwon Park ◽  
Sanghwa Jeong ◽  
Jiwon Bang ◽  
Bomi Kim ◽  
Hyunmi Doh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Cadmium Chalcogenide

scholarly journals Layer-by-Layer Deposition of Organically Capped Quantum Dots

2006 ◽  
Vol 514-516 ◽  
pp. 1111-1115 ◽  
Author(s):  
Márcia C. Neves ◽  
Angela S. Pereira ◽  
Marco Peres ◽  
Andréi L. Kholkin ◽  
Teresa Monteiro ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Linear Increase ◽  
Layer By Layer ◽  
Layered Systems ◽  
Quantum Size ◽  
Layer Deposition ◽  
Cadmium Chalcogenide ◽  
Afm Analysis ◽  
Quartz Substrates ◽  
Light Absorbance

Cadmium chalcogenide quantum dots (QD’s) were synthesised using a single source approach while zinc oxide QD’s were obtained by a colloidal technique. In both situations the dots were surface capped with tri-octylphosphine oxide (TOPO) hence leading to nanodispersed systems in organic solvents such as toluene. The organically capped QD’s (CdSe, CdS and ZnO) were used as building-units to fabricate LbL (layer-by-layer) films on glass and quartz substrates. A linear increase in the visible light absorbance (due to the QD’s) with the number of deposited layers indicates that multi-layered systems have been fabricated. In order to investigate the effect of the LbL manipulation on the integrity of the QD’s, comparative studies on the optical properties of the starting QD’s and the nanostructured films have been performed. The observation of quantum size effects in both cases suggests minimal degradation of the QD’s though clustering had probably occurred, a point which was further confirmed by AFM analysis.

Dependence of Luminescence Efficiency of CdSe Quantum Dots on Chemical Environments

2008 ◽  
Vol 8 (11) ◽  
pp. 5615-5623 ◽  
Author(s):  
Rajan Jose ◽  
Mitsuru Ishikawa ◽  
Velmurugan Thavasi ◽  
Yoshinobu Baba ◽  
Seeram Ramakrishna
Keyword(s):  
Quantum Dots ◽  
Cadmium Acetate ◽  
Trioctylphosphine Oxide ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
Luminescence Efficiency ◽  
Cadmium Stearate

Dependence of photoluminescence (PL) efficiency (ΦPL) of CdSe quantum dots (QDs) on coordinating solvents, precursors, and dispersing solvents was investigated. The ΦPL of CdSe QDs was ∼0.05 when synthesized at 120 °C using the precursors, cadmium acetate (CdAc) and trioctylphosphine selenide (TOPSe) in trioctylphosphine (TOP). The ΦPL was increased from 0.05 to ∼0.1 when coordinating solvents, trioctylphosphine oxide (TOPO) and hexadecylamine (HDA), were added to the above reaction mixture. The ΦPL was dramatically increased from ∼0.1 to ∼0.7 when CdAc was replaced by cadmium stearate (CdSt). The ΦPL of CdSe QDs synthesized using cadmium stearate (CdSt)/TOPSe/TOP/TOPO was measured in butanol, chloroform, hexane, and toluene and found that the ΦPL is strong dispersing solvent-dependent. The DFT analysis at b3lyp/lanl2dz level on the interaction of CdSe QDs with chemical environments showed that oxygen-containing molecules interact strongly with CdSe compared to non-oxygen containing molecules and could influence the ΦPL.

Rhizopus stolonifer mediated biosynthesis of biocompatible cadmium chalcogenide quantum dots

2016 ◽  
Vol 95 ◽  
pp. 225-229 ◽  
Author(s):  
P. Mareeswari ◽  
J. Brijitta ◽  
S. Harikrishna Etti ◽  
C. Meganathan ◽  
Gobi Saravanan Kaliaraj
Keyword(s):  
Quantum Dots ◽  
Rhizopus Stolonifer ◽  
Cadmium Chalcogenide

The Facile Synthesis of Nanocrystalline Semiconductor Quantum Dots

2001 ◽  
Vol 676 ◽  
Author(s):  
Michael S. Wong ◽  
Galen D. Stucky
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Cadmium Acetate ◽  
Semiconductor Quantum Dots ◽  
Systematic Effect ◽  
Particle Sizes ◽  
Facile Synthesis ◽  
High Quality ◽  
Organometallic Precursors ◽  
General Method

ABSTRACTCurrent synthetic techniques to high-quality quantum dots (“QD's”) involve organometallic precursors that are hazardous and expensive and require they be rapidly injected into an extremely hot solvent to form the QD's. A new method for synthesizing high-quality CdSe QD's while circumventing these problems has been developed. Different cadmium salts were studied as Cd precursors alternative to dimethylcadmium. High-quality CdSe QD's were found possible with cadmium acetate as the Cd precursor. Changes in solvent temperature and reaction time had a systematic effect on QD particle sizes and the accompanying optical properties. These preliminary results point to a general method for producing high-quality QD's that is safer and much more versatile.

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