SYNTHESIS AND CHARACTERIZATION OF FLUORESCENT Cu2S NANOPARTICLES EMBEDDED IN AMORPHOUS POLYSTYRENE

2010 ◽  
Vol 09 (05) ◽  
pp. 385-389 ◽  
Author(s):  
G. CAROTENUTO ◽  
F. CAPEZZUTO ◽  
M. PALOMBA ◽  
F. NICOLAIS
Keyword(s):  
Thermal Decomposition ◽  
Synthesis And Characterization ◽  
Broad Emission Band ◽  
Trap State ◽  
Broad Emission ◽  
Time Period ◽  
Polystyrene Matrix ◽  
Red Luminescence ◽  
Quenching Phenomenon

Very small Cu2S nanoparticles have been generated inside an amorphous polystyrene matrix by thermal decomposition of Cu(I) mercaptide molecules dissolved in the polymer. The resulting nanocomposite material was transparent, yellow colored, and characterized by a quite strong red luminescence. In particular, the sample photoluminescence (PL) spectrum showed three excitation wavelengths and a quite broad emission band resulting from the combination of band-edge and trap-state emission. However, luminescence was not stable over the time and a quenching phenomenon was observed after a time period of ca. three months.

Synthesis and Characterization of Nanocrystalline ZnO Powders by a Direct Thermal Decomposition Route Using Zinc Nitrate Hexahydrate

2013 ◽  
Vol 770 ◽  
pp. 68-71 ◽  
Author(s):  
Supphadate Sujinnapram ◽  
Uraiphorn Termsuk ◽  
Atcharawan Charoentam ◽  
Sutthipoj Sutthana
Keyword(s):  
Thermal Decomposition ◽  
Crystallization Temperature ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Absorption Peak ◽  
Synthesis And Characterization ◽  
Nitrate Hexahydrate ◽  
Different Temperatures ◽  
Zno Powders

The nanocrystalline ZnO powders were synthesized by a direct thermal decomposition using zinc nitrate hexahydrate as starting materials. The precursor was characterized by TG-DTA to determine the thermal decomposition and crystallization temperature which was found to be at 325 oC. The precursors were calcined at different temperatures of 400, 500, and 600°C for 4 h. The structure of the prepared samples was studied by XRD, confirming the formation of wurtzite structure. The synthesized powders exhibited the UV absorption below 400 nm (3.10 eV) with a well defined absorption peak at around 285 nm (4.35 eV). The estimated direct bandgaps were obtained to be 3.19, 3.16, and 3.14 eV for the ZnO samples thermally decomposed at 400, 500, and 600°C, respectively.

scholarly journals Synthesis and characterization of ZnO nanoparticles by thermal decomposition of a curcumin zinc complex

2014 ◽  
Vol 7 (6) ◽  
pp. 1178-1184 ◽  
Author(s):  
Mutasim I. Khalil ◽  
Maha M. Al-Qunaibit ◽  
Aisha M. Al-zahem ◽  
Joselito P. Labis
Keyword(s):  
Thermal Decomposition ◽  
Zno Nanoparticles ◽  
Zinc Complex ◽  
Synthesis And Characterization

Hydrothermal Synthesis and Characterization of Nanocrystalline Gd2Sn2O7:Eu3+ Phosphors

2011 ◽  
Vol 239-242 ◽  
pp. 2851-2854 ◽  
Author(s):  
Jin Yu Yang ◽  
Yu Chang Su ◽  
Zhuo Chen ◽  
Xue Ying Liu
Keyword(s):  
Single Phase ◽  
Concentration Quenching ◽  
Synthesis And Characterization ◽  
Photoluminescence Properties ◽  
Excitation Spectra ◽  
Pyrochlore Type ◽  
Co Precipitation ◽  
Synthesized Materials ◽  
Quenching Phenomenon

Phase-pure Eu3+doped Gd2Sn2O7nanocrystals have been successfully synthesized via a co-precipitation processes combined with hydrothermal treatment. The crystal structure, particle size, morphologies, composition, and photoluminescence properties of the as-synthesized products were investigated by XRD, SEM, TEM, EDS and PL. The samples were single-phase cubic pyrochlore-type nanocrystals with a typical size of about 30 - 60 nm. All the samples exhibited irregular flower like secondary nanostructure assembled by primary nanoparticles. Photoluminescence properties of Gd2Sn2O7:Eu3+were investigated, and the results revealed that the as-synthesized materials displayed intense and prevailing emission located at 580 - 630 nm. The excitation spectra indicated that an energy transfer from Gd3+to Eu3+occurred. Meanwhile, the concentration quenching phenomenon was observed in Gd2Sn2O7:Eu3+nanocrystals.

Synthesis and characterization of NiO nanoclusters via thermal decomposition

Polyhedron ◽  
2009 ◽  
Vol 28 (6) ◽  
pp. 1111-1114 ◽  
Author(s):  
Masoud Salavati-Niasari ◽  
Noshin Mir ◽  
Fatemeh Davar
Keyword(s):  
Thermal Decomposition ◽  
Synthesis And Characterization

Synthesis and characterization of AgGaS2 nanoparticles: a study of growth and fluorescence

2018 ◽  
Vol 54 (1) ◽  
pp. 62-65 ◽  
Author(s):  
Sky Paderick ◽  
Matthew Kessler ◽  
Tyler J. Hurlburt ◽  
Steven M. Hughes
Keyword(s):  
Band Gap ◽  
Synthesis And Characterization ◽  
Trap State ◽  
Gallium Sulfide ◽  
Sulfide Nanocrystals

Silver gallium sulfide nanocrystals demonstrate tunability for trap-state emission (650 nm) or band gap fluorescence (460 nm).

scholarly journals Direct synthesis and characterization of mixed-valent Li0.5−δCoPO4, a Li-deficient derivative of the Cmcm polymorph of LiCoPO4

RSC Advances ◽  
2017 ◽  
Vol 7 (45) ◽  
pp. 28069-28081 ◽  
Author(s):  
Jennifer Ludwig ◽  
Carlos Alarcón-Suesca ◽  
Stephan Geprägs ◽  
Dennis Nordlund ◽  
Marca M. Doeff ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Direct Synthesis ◽  
Decomposition Mechanism ◽  
Synthesis And Characterization ◽  
Thermal Decomposition Mechanism

Li0.5−δCoPO4, the first Li-deficient, mixed-valent Co(ii,iii) derivative of Cmcm-LiCoPO4, exhibits a complex, multi-step thermal decomposition mechanism.

Synthesis and Characterization of Co Nanoparticles by Solventless Thermal Decomposition

2007 ◽  
Vol 119 ◽  
pp. 71-74 ◽  
Author(s):  
Yan Li ◽  
Xiao Li Zhang ◽  
Young Hwan Kim ◽  
Young Soo Kang
Keyword(s):  
Crystal Structure ◽  
Thermal Decomposition ◽  
Synthesis And Characterization ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Structure Of Nanoparticles ◽  
Co Nanoparticles

Co nanoparticles were synthesized via a solventless thermal decomposition of Co2+-oleate2. The crystalline structure is strongly affected by the thermal treatment of the Co nanoparticles. Further, the annealing also results in the decomposition of surfactant around Co particles. The size of nanoparticles was confirmed by transmission electron microscopy (TEM). The crystal structure of nanoparticles was characterized by X-ray diffraction pattern (XRD). The magnetic properties were characterized by vibrating sample magnetometer (VSM).

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