Synthesis and Characterization of Water-Soluble Cu2+-Doped ZnSe Quantum Dots

2009 ◽  
Vol 79-82 ◽  
pp. 2043-2046 ◽  
Author(s):  
Shan Shan Li ◽  
Fu Tian Liu ◽  
Qun Wang ◽  
Xiu Xiu Chen ◽  
Ping Yang
Keyword(s):  
Quantum Dots ◽  
Green Emission ◽  
Average Diameter ◽  
Water Soluble ◽  
X Ray ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Uv Excitation ◽  
Zinc Blende Structure

Cu2+-doped ZnSe quantum dots (ZnSe:Cu) were prepared via a green and simple route, namely the chemical coprecipitation method. Under 365 nm UV excitation, green emission is observed. X-ray powder diffraction (XRD) shows that ZnSe:Cu nanoparticle is cubic zinc blende structure; the transmission electron microscopy (TEM) exhibits that the average diameter of ZnSe:Cu nanocrystals is less than 10 nm. UV-vis spectrophotometer and fluorescence spectrophotometer indicate that ZnSe:Cu nanocrystals have good fluorescence effects.

Effect of L-Cysteine on Photoluminescence of Zns:F Quantum Dots

2018 ◽  
Vol 281 ◽  
pp. 716-722
Author(s):  
Xiao Xuan Wang ◽  
Shu Zhen Wang ◽  
Shu Wang Duo ◽  
Xing Yu Jiang ◽  
Wen Li Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Solubility ◽  
Luminescent Properties ◽  
Solid State Method ◽  
X Ray ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Structure Surface ◽  
State Method ◽  
Zinc Blende Structure

ZnS:F quantum dots (QDs) capping with and without L-cys were synthesized by a solid-state method at low temperature, and the influence of L-cys on the properties of ZnS:F QDs were investigated. The crystal structure, surface morphology and luminescent properties of the samples were analyzed by X-ray diffractometer (XRD), transmission electron microscope (TEM), fourier transform infrared (FTIR), photoluminescence spectrometer (PL) and ultraviolet-visible spectrometer (UV-Vis). The results showed that all samples had a zinc blende structure with particle size in the range of 2-6 nm. The emission intensity was significantly enhanced after capping with L-cys, and the strongest luminescence was obtained when the ratio of L-cys/ZnS:F was 0.8:1, and was about 2.5 times of that of ZnS:F QDs. The capping of L-cys increased the grain size of ZnS:F QDs and their water solubility.

Characterization of Al65.0Cu32.9Co2.1 Alloy Containing Nanofibres

2012 ◽  
Vol 186 ◽  
pp. 212-215
Author(s):  
Jacek Krawczyk ◽  
Włodzimierz Bogdanowicz ◽  
Grzegorz Dercz ◽  
Wojciech Gurdziel
Keyword(s):  
Electron Microscopy ◽  
Average Diameter ◽  
Chemical Compositions ◽  
X Ray ◽  
Transmission Electron ◽  
Orthogonal Set ◽  
T Phase ◽  
Terminal Area ◽  
Scanning Electron

Microstructure of terminal area of Al65Cu32.9Co2.1ingots (numbers indicate at.%), obtained via directional solidification was studied. Scanning Electron Microscopy, Transmission Electron Microscopy and X-ray powder diffraction were applied. Point microanalysis by Scanning Electron Microscope was used for examination of chemical compositions of alloy phases. It was found that tetragonal θ phase of Al2Cu stoichiometric formula was the dominate phase (matrix). Additionally the alloy contained orthogonal set of nanofibres of Al7Cu2Co T phase with the average diameter of 50-500 nm and oval areas of hexagonal Al3(Cu,Co)2H-phase, surrounded by monoclinic AlCu η1phase rim. Inside some areas of H-phase cores of decagonal quasicrystalline D phase were observed.

Epitaxial growth of skutterudite (CoSb3) thin films on (001) InSb by pulsed laser deposition

2001 ◽  
Vol 16 (9) ◽  
pp. 2467-2470 ◽  
Author(s):  
J. C. Caylor ◽  
M. S. Sander ◽  
A. M. Stacy ◽  
J. S. Harper ◽  
R. Gronsky ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Heteroepitaxial Growth ◽  
X Ray Diffraction ◽  
Epitaxial Relationship ◽  
X Ray ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Zinc Blende Structure

Heteroepitaxial growth of the cubic skutterudite phase CoSb3 on (001) InSb substrates was achieved by pulsed laser deposition using a substrate temperature of 270 °C and a bulk CoSb3 target with 0.75 at.% excess Sb. An InSb (a0 = 4 0.6478 nm) substrate was chosen for its lattice registry with the antimonide skutterudites (e.g., CoSb3 with a = 0 4 0.9034 nm) on the basis of a presumed 45° rotated relationship with the InSb zinc blende structure. X-ray diffraction and transmission electron microscopy confirmed both the structure of the films and their epitaxial relationship: (001)CoSb3 ∥ (001)InSb; [100]CoSb3 ∥ [110]InSb.

Synthesis and Characterization of Graphene/Cu2SnS3 Quantum Dots Composites

2012 ◽  
Vol 624 ◽  
pp. 59-62 ◽  
Author(s):  
Cai Xia Li ◽  
Jun Guo ◽  
Danyu Jiang ◽  
Qiang Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Quantum Dots ◽  
Raw Materials ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Phase Structures ◽  
Transmission Electron

In this paper, employing Cu(AC)2•H2O, SnCl2•2H2O and thiourea as raw materials, the composites of graphene/Cu2SnS3 quantum dots (QDs) were prepared simply and quickly using the hydrothermal method. Meanwhile, the separate Cu2SnS3 QDs were also synthesized in the same way. The as-obtained Cu2SnS3 QDs and composites’ phase structures were analyzed and characterized by powder X-ray diffraction (XRD), and the results indicated that the size of the Cu2SnS3 QDs in the composites were less than that of the separate Cu2SnS3 QDs. At the same time, their morphologies were also observed and cross-confirmed by Transmission Electron Microscopy (TEM), and the measurements manifested that Cu2SnS3 QDs were uniformly dispersed on the surface of the graphene, while the separate Cu2SnS3 QDs have obvious glomeration. In addition to this, elemental analysis was also made to verify the existence of Cu2SnS3 on the surface of graphene.

Optical Properties of Water-Soluble Er-Doped ZnS Quantum Dots Synthesized by a Hydrothermal Process

2013 ◽  
Vol 800 ◽  
pp. 402-405 ◽  
Author(s):  
Gang Li ◽  
Li Hua Li ◽  
Liu Shuan Yang ◽  
Jin Liang Huang
Keyword(s):  
Quantum Dots ◽  
Average Particle Size ◽  
Hydrothermal Process ◽  
Water Soluble ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Er Doped

Er3+:ZnS quantum dots(QDs) were synthesized by hydrothermal process. The structure, morphology and luminescence properties were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. It was found that the Er3+:ZnS QDs are zinc blende structure with an average particle size of about 8 nm. In PL spectra, The broad peak of ZnS NCs located at 400nm was commonly assigned to sulfur vacancies. The intensity of exciting peak and emission peak at of Er3+:ZnS QDs decreased with doping concentration increasing.

Fabrication and Up-Conversion Luminescence of Er3+:Y2O3 Nanoparticles

2008 ◽  
Vol 8 (3) ◽  
pp. 1211-1213 ◽  
Author(s):  
Luo Jun-Ming ◽  
Li Yong-Xiu ◽  
Deng Li-Ping ◽  
Yuan Yong-Rui ◽  
Chen Wei-Fan
Keyword(s):  
Doping Concentration ◽  
Green Emission ◽  
Average Diameter ◽  
Precipitation Method ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Radiative Transitions ◽  
Transmission Electron ◽  
Co Precipitation

Y2O3 nanoparticles doped with different concentrations of Er3+ were prepared by the co-precipitation method. X-ray diffraction and transmission electron microscopy results show that Er3+ dissolves completely in the Y2O3 cubic phase. The Er3+:Y2O3 nanoparticles are homogeneous in size and nearly spherical, and the average diameter of the particles after being calcined at 1,000 °C for 2 h is in the range of 40–60 nm. When Er3+:Y2O3 nanoparticles are excited under a 980 nm diode laser, there are two main emission bands: green emission centered at 562 nm corresponding to the 4S3/2/2H11/2 → 4I15/2 radiative transitions and red emission centered at 660 nm corresponding to the 4F9/2 ∼ 4I15/2 radiative transitions. By changing the doping concentration of Er3+ ions, the up-conversion luminescence can be gradually tuned from green to red.

Synthesis and Characterization of Spherical Hollow Assembly Composed of Cu Nanoparticles

2007 ◽  
Vol 72 (10) ◽  
pp. 1375-1382 ◽  
Author(s):  
Ming Yang ◽  
Xiao Yang
Keyword(s):  
Hollow Spheres ◽  
Decisive Role ◽  
Average Diameter ◽  
Synthesis And Characterization ◽  
Cu Nanoparticles ◽  
X Ray ◽  
Transmission Electron ◽  
Direct Attack ◽  
Spherical Hollow

Hollow spheres of Cu nanoparticles with an average diameter of 300-500 nm have been prepared by a simple reaction of CuCl and hydrazine in suspension in the presence of gelatin at 60 °C. Gelatin played a decisive role as an inhibitor of the direct attack of hydrazine on CuCl surfaces and in coagulation of the growing Cu producing the hollow spheres. The products were characterized by X-ray powder diffraction, transmission electron microscopy, UV-VIS absorption spectroscopy and X-ray photoelectron spectrometry.

Selective Growth of Gold onto Copper Indium Sulfide Selenide Nanoparticles

2013 ◽  
Vol 68 (5) ◽  
pp. 398-404 ◽  
Author(s):  
Elena Witt ◽  
Jürgen Parisi ◽  
Joanna Kolny-Olesiak
Keyword(s):  
Hybrid Nanostructures ◽  
Indium Sulfide ◽  
X Ray Diffraction ◽  
Gold Nanocrystals ◽  
X Ray ◽  
Copper Indium Disulfide ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Copper Indium ◽  
Zinc Blende Structure

Hybrid nanostructures are interesting materials for numerous applications in chemistry, physics, and biology, due to their novel properties and multiple functionalities. Here, we present a synthesis of metal-semiconductor hybrid nanostructures composed of nontoxic I-III-VI semiconductor nanoparticles and gold. Copper indium sulfide selenide (CuInSSe) nanocrystals with zinc blende structure and trigonal pyramidal shape, capped with dodecanethiol, serve as an original semiconductor part of a new hybrid nanostructure. Metallic gold nanocrystals selectively grow onto vertexes of these CuInSSe pyramids. The hybrid nanostructures were studied by transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, and UV-Vis-absorption spectroscopy, which allowed us conclusions about their growth mechanism. Hybrid nanocrystals are generated by replacement of a sacrificial domain in the CuInSSe part. At the same time, small selenium nanocrystals form that stay attached to the remaining CuInSSe/Au particles. Additionally, we compare the synthesis and properties of CuInSSe-based hybrid nanostructures with those of copper indium disulfide (CuInS2). CuInS2/Au nanostructures grow by a different mechanism (surface growth) and do not show any selectivity.

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