Colloidal Synthesis of CdSe Nanocrystals: Preparation, Characterization in Different Organic Solvent

2020 ◽  
Vol 29 ◽  
pp. 1-7
Author(s):  
Akeel M. Kadim
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Organic Solvent ◽  
Industrial Development ◽  
Phase Transfer ◽  
Energy Difference ◽  
Colloidal Synthesis ◽  
Cdse Nanocrystals ◽  
Solution Technique ◽  
White Light Generation

Colloidal CdSe Nanocrystals (NCs) or quantum dots (QDs) have been developed using a yielding solution technique utilizing chemical reactions in chloroform and oleic acid in different organic solvents. This assembly is an improvement of the systematic thermal decomposition of high temperature organic solvent compounds. CdSe NCs of specific sizes can be produced easily by adjusting the solvent. This technique is reproducible and clear, so industrial development can be easily scaled up. Characterization at room temperature of the UV-Vis absorption and Photoluminescence (PL) spectra. Results reveal that the CdSe prepared with the creation of defects was nanocrystalline. The energy difference (Eg) measured in PL was 2.3 and 2.69 eV respectively for CdSe NCs in chloroform and oleic acid. The structures of the CdSe quantum dots were determined by scanning electron microscopy (SEM). The phase-transfer of chloroform and oleic acid stabilized CdSe nanocrystals solutions was studied for their potentials in white light generation applications.

Efficient phase transfer of hydrophobic CdSe quantum dots: From nonpolar organic solvent to biocompatible water buffer

2005 ◽  
Vol 93 (2-3) ◽  
pp. 310-313 ◽  
Author(s):  
Liyun Feng ◽  
Xianggui Kong ◽  
Kefu Chao ◽  
Yajuan Sun ◽  
Qinghui Zeng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Organic Solvent ◽  
Phase Transfer ◽  
Cdse Quantum Dots ◽  
Nonpolar Organic

Colloidal Synthesis of Luminescent Quantum Dots in Macadamia Oil

2013 ◽  
Vol 1546 ◽  
Author(s):  
Menglu Li ◽  
Weng Leong Chan ◽  
Hannah C. Gardner
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Acid Concentration ◽  
Low Cost ◽  
Semiconductor Nanocrystals ◽  
Inert Atmosphere ◽  
Colloidal Synthesis ◽  
Cancer Therapies ◽  
Research Fields ◽  
Oleic Acid Concentration

ABSTRACTSemiconductor nanocrystals or quantum dots are becoming increasingly popular in research fields as wide ranging as cancer therapies, solar energy and disease detection. Colloidal synthesis provides a low-cost method of producing high quality quantum dots with narrow size distributions. The controllable nature of colloidal synthesis allows researchers to design the size, shape and surface functionalization of the resulting particles.Here we investigate a simple low temperature method to produce CdSe quantum dots. The quantum dots were grown in solution by dissolving the CdO precursor in a mixture of macadamia oil, and oleic acid. Elemental Se was heated separately before the two mixtures were combined under an inert atmosphere. The injection temperature, reaction temperature and oleic acid concentration were all varied.Optical absorption and photoluminescence spectroscopies showed the size of the quantum dots increased with time, temperature and oleic acid concentration. Dynamic light scattering has shown the hydrodynamic particle size to range from 7 to 22nm and the samples for up to 6 months.

3D superstructures with an orthorhombic lattice assembled by colloidal PbS quantum dots

Nanoscale ◽  
2018 ◽  
Vol 10 (17) ◽  
pp. 8313-8319 ◽  
Author(s):  
Elena V. Ushakova ◽  
Sergei A. Cherevkov ◽  
Aleksandr P. Litvin ◽  
Peter S. Parfenov ◽  
Igor A. Kasatkin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Lead Sulfide ◽  
Organic Matrix ◽  
Orthorhombic Lattice ◽  
3D Network ◽  
New Type ◽  
Self Assembled ◽  
Lead Sulfide Quantum Dots ◽  
Pbs Quantum Dots

We report a new type of metamaterial comprising a highly ordered 3D network of 3–7 nm lead sulfide quantum dots self-assembled in an organic matrix formed by amphiphilic ligands (oleic acid molecules).

scholarly journals Noncovalent Attachment of PbS Quantum Dots to Single- and Multiwalled Carbon Nanotubes

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Anirban Das ◽  
Eric Hall ◽  
Chien M. Wai
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Oleic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Stacking Interactions ◽  
Multiwalled Carbon ◽  
Nir Fluorescence ◽  
Walled Carbon Nanotubes ◽  
Pbs Quantum Dots

Attachment of PbS quantum dots (QD) to single-walled carbon nanotubes (SWNT) and multiwalled carbon nanotubes (MWCNT) is described; wherein commercially obtained PbS-QD of size 2.7 nm, stabilized by oleic acid, are added to a suspension of single- or multiwalled carbon nanotubes (CNT) prefunctionalized noncovalently with 1,2-benzenedimethanethiol (1,2-BDMT) in ethanol. The aromatic part of 1,2-BDMT attaches to the CNT byπ-πstacking interactions, noncovalently functionalizing the CNT. The thiol part of the 1,2-BDMT on the functionalized CNT replaces oleic acid on the surface of the QD facilitating the noncovalent attachment of the QD to the CNT. The composites were characterized by TEM and FTIR spectroscopy. Quenching of NIR fluorescence of the PbS-QD on attachment to the carbon nanotubes (CNT) was observed, indicating FRET from the QD to the CNT.

CdSe/ZnS quantum dots capped with oleic acid and L-glutathione: structural properties and application in detection of Hg2+

2021 ◽  
pp. 132293
Author(s):  
Gilma Granados-Oliveros ◽  
Brayan Stiven Gómez Pineros ◽  
Fredy Giovany Ortiz Calderon
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Structural Properties

scholarly journals Glycerol–water mediated centrifuge controlled green synthesis of oleic acid capped PbS quantum dots for live cell imaging

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40664-40668 ◽  
Author(s):  
M. Vijaya Bharathi ◽  
Kaustab Ghosh ◽  
Priyankar Paira
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Green Synthesis ◽  
Live Cell Imaging ◽  
Cell Imaging ◽  
Live Cell ◽  
Glycerol Water ◽  
Pbs Quantum Dots

Glycerol–water mediated green synthesis of PbS quantum dots (QDs) is introduced utilizing distinctive precipitation strategies for bioimaging application.

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