A Facile Route for the Synthesis of Poly(N-vinylcarbazole)/Manganese Sulphide Quantum Dots Nanocomposites with Enhanced Optical Properties

2008 ◽  
Vol 8 (11) ◽  
pp. 6031-6037 ◽  
Author(s):  
Nosipho Moloto ◽  
Suprakas Sinha Ray ◽  
Makwena Justice Moloto
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Electron Microscope ◽  
Elevated Temperature ◽  
Room Temperature ◽  
Single Source ◽  
Precursor Method ◽  
Tetramethylthiuram Disulfide ◽  
Single Source Precursor ◽  
Facile Route

This communication describes a facile route for the synthesis of manganese sulphide (MnS) quantum dots (QDs) contained in poly(N-vinyl carbazole) (PNVC) nanocomposites. MnS QDs were synthesized using the single-source precursor method by thermolysing tetramethylthiuram disulfide manganese complex in hexadecylamine (HDA). Two different methods were used for the synthesis of MnS QD incorporated PNVC nanocomposites. The first method entailed the stirring of a mixture of MnS QDs and PNVC in chloroform (CHCl3) at room temperature and the second method was the refluxing of MnS QDs and PNVC solution in CHCl3 at an elevated temperature. A field emission electron microscope (FESEM) study revealed that the dispersion of MnS QDs in a PNVC matrix was improved in the case of nanocomposites prepared by the second method. The optical properties of pure PNVC were significantly altered for the case of nanocomposite prepared by the second route.

Synthesis of Undoped and Manganese-Doped HgTe Nanoparticles Using [Hg(TeCH2CH2NMe2)2] as a Single Source Precursor

2008 ◽  
Vol 8 (9) ◽  
pp. 4500-4505 ◽  
Author(s):  
Gotluru Kedarnath ◽  
Sandip Dey ◽  
Vimal K. Jain ◽  
Gautam K. Dey ◽  
Ramakant M. Kadam
Keyword(s):  
Particle Size ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Lattice Parameter ◽  
Crystalline Solid ◽  
Single Source ◽  
Epr Spectrum ◽  
Single Source Precursor ◽  
Ferromagnetic Ordering ◽  
Mn Doped

The Reaction of [HgCl2(tmeda)] with NaTeCH2CH2NMe2 gave a mercury tellurolate, [Hg(TeCH2CH2·NMe2)2] (1) as a yellow crystalline solid, which was characterized by elemental analysis, UV-vis, mass and NMR (1H, 13C, 125Te, 199Hg) spectroscopy. Thermolysis of 1 in hexadecylamine (HDA) at 90 °C in the absence and presence of Mn(OAc)2·4H2O gave undoped and Mn-doped HgTe nanoparticles which were characterized by XRD, EDAX, TEM, EPR and magnetic measurements. These particles could be synthesized with mean particle size of 6–7 nm (from TEM). Manganese substitution at Hg site in HgTe lead to a linear decrease in lattice parameter with increasing concentration of Mn. Magnetization measurements showed ferromagnetic ordering at room temperature with very small coercive field (Hc, 50 Oe) for Hg0.973Mn0.027 Te sample. This sample also exhibited distinct ferromagnetic resonance (FMR) in the EPR spectrum.

Synthesis and Applications of Crack-Free SiO2 Monolith Containing CdSe/ZnS Quantum Dots as Passive Lighting Sources

2008 ◽  
Vol 8 (9) ◽  
pp. 4538-4542 ◽  
Author(s):  
Dong Kee Yi
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Polymer Matrix ◽  
High Power ◽  
Surface Coating ◽  
Room Temperature ◽  
Ethanol Solution ◽  
Uv Led ◽  
Uv Lamp ◽  
Photo Stability

A reverse microemulsion technique has been used to synthesize quantum dot nanocomposites within a SiO2 surface coating. With this approach, the unique optical properties of the CdSe/ZnS quantum dots were preserved. CdSe/ZnS/SiO2 nanoparticles were homogeneously distributed in a tetramethyl orthosilicate ethanol solution and gelation process was initiated within a 10 min, and was left over night at room temperature and dried fully to achieve a solid SiO2 monolith. The resulting monolith was transparent and fluorescent under ultraviolet (UV) lamp. Moreover the monolith produced was crack-free. Further studies on the photo stability of the monolith were performed using a high power UV LED device. Remarkably, quantum dots in the SiO2 monolith showed better photo stability compared with those dispersed in a polymer matrix.

Facile in situ thermolytic growth of ZnS quantum dots in polystyrene matrix from zinc pyrrolidinedithiocarbamate as single source precursor

2013 ◽  
Vol 109 ◽  
pp. 186-189 ◽  
Author(s):  
Mar Christian O. Que ◽  
Mari Montesa ◽  
Jo Ann Sy ◽  
Blessie A. Basilia ◽  
Ian Harvey J. Arellano
Keyword(s):  
Quantum Dots ◽  
Single Source ◽  
Polystyrene Matrix ◽  
Single Source Precursor

Room Temperature Optical Properties of Single Perovskite Quantum Dots

2020 ◽  
Author(s):  
Gabriele Raino ◽  
Franziska Krieg ◽  
Maryna I. Bodnarchuk ◽  
Maksym V. Kovalenko
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Room Temperature ◽  
Perovskite Quantum Dots

scholarly journals Retraction: N, S co-doped graphene quantum dots from a single source precursor used for photodynamic cancer therapy under two-photon excitation

2015 ◽  
Vol 51 (49) ◽  
pp. 10066-10066 ◽  
Author(s):  
Rijun Gui ◽  
Xifeng Liu ◽  
Hui Jin ◽  
Zonghua Wang ◽  
Feifei Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cancer Therapy ◽  
Graphene Quantum Dots ◽  
Single Source ◽  
Two Photon ◽  
Photon Excitation ◽  
Single Source Precursor ◽  
Photodynamic Cancer Therapy ◽  
Doped Graphene ◽  
Co Doped

Retraction of ‘N, S co-doped graphene quantum dots from a single source precursor used for photodynamic cancer therapy under two-photon excitation’ by Rijun Gui et al., Chem. Commun., DOI: 10.1039/C4CC09280E.

scholarly journals Designing the morphology of PbS nanoparticles through a single source precursor method

2017 ◽  
Vol 21 (5) ◽  
pp. 593-598 ◽  
Author(s):  
Kalenga Pierre Mubiayi ◽  
Neerish Revaprasadu ◽  
Shivram S. Garje ◽  
Makwena Justice Moloto
Keyword(s):  
Single Source ◽  
Precursor Method ◽  
Pbs Nanoparticles ◽  
Single Source Precursor
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