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.

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.

Preparation and Luminescence Properties of ZnS: Cu/Fe Nanocrystalline

2014 ◽  
Vol 1033-1034 ◽  
pp. 1054-1057
Author(s):  
Xiang Zhang ◽  
Jin Liang Huang ◽  
Li Hua Li
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Thioglycolic Acid ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Fe Nanoparticles

ZnS: Cu/Fe nanocrystals were synthesized by hydrothermal method with thioglycolic acid as a stabilizer. The phases, grain size and luminescent properties of the nanocrystals were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and fluorescence photometer respectively. The results showed that ZnS: Cu/Fe nanoparticles have a particle size about 7nm and possess a cubic zinc blende crystal structure. The luminous intensity of ZnS: Cu/Fe nanocrystals was strongly when they were reacted at 140°C for 12 hours.

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.

A Study of the Photoluminescence and Reflectivity Spectra of MOCVD Grown MnSe

1994 ◽  
Vol 340 ◽  
Author(s):  
M. Di Blasio ◽  
L. Aigouy ◽  
M. Averous ◽  
J. Calas ◽  
P. Tomasini ◽  
...  
Keyword(s):  
Energy Gap ◽  
Stokes Shift ◽  
Thin Layers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zinc Blende ◽  
Reflectivity Spectra ◽  
Different Temperatures ◽  
First Time ◽  
Zinc Blende Structure

Photoluminescence (PL) experiments at 2K are performed on MOCVD grown MnSe. The precursors used in the growth stage are methylpentacarbonylmanganese and diethylselenide. Pyrolysis of the percursors is realized inside a gradient reactor under a constant H2 flux, between 280-55°TC. The compound is epitaxially grown on various substrates (Si, InP, GaSb, GaAs, ZnTe/GaAs, etc.). On some of these samples the compound presents a zinc blende structure, while in the other samples rock salt formation has been identified. The first substrate is used because of its interest in Si technology, while the others are used because MnSe can be grown in the zinc blende phase for very thin layers. For the first time x-ray diffraction data has allowed us to determine the lattice constant of zincblende MnSe (aMnse (oct)=5.818Å), confirming the close approximation (a ∼ 5.9Å) used from the Zn1-xMnxSe alloy. These compounds have visible Mn++ transitions at 2.12-5eV; other features are also visible at 2.3-4, 2.7, and 3.0eV. The energy gap transition of tetrahedral thin film layers of MnSe is seen for the first time in PL spectra. A temperature dependant PL study is performed on MnSe in the 2-200K range. Reflectivity experiments are used to attempt to identify the internal manganese transitions. A qualitative PL analysis of the samples grown at different temperatures and on different substrates is provided. A Stokes shift is encountered when the results are compared.

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.

Phosphine-Free Synthesis and Photoluminescence Properties of ZnSe:Cu/ZnSe/ZnS Core/Shell Nanocrystals

2012 ◽  
Vol 549 ◽  
pp. 12-16 ◽  
Author(s):  
Jin Zhong Niu ◽  
Gui Min Tian ◽  
Li Li Zheng ◽  
Yong Guang Cheng ◽  
Shuang Mei Zhu ◽  
...  
Keyword(s):  
Emission Peak ◽  
Core Shell ◽  
Size Distributions ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Structures And Properties ◽  
Znse Nanocrystals

High quality zinc blende ZnSe nanocrystals were successfully synthesized using an environmentally friendierly phosphine-free method. Using pre-synthesized ZnSe nanocrystals as core to dope Cu2+ ions, we obtained ZnSe:Cu/ZnSe and ZnSe:Cu/ZnSe/ZnS core/shell nanocrystals. Absorption spectruscopy, photoluminescence (PL) spectruscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM) were used to characterize the structures and properties of as-synthesized three kinds of nanocrystals. The results demonstrated that nanocrystals had well dispersion and narrow size-distributions, and the PL emission peak of as-synthesized ZnSe:Cu/ZnSe/ZnS core/shell nanocrystals could be easily tuned from 480 nm to 520 nm by using different sized ZnSe cores.

scholarly journals Synthesis of PVP-Capped Au-CdSe Hybrid Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-4
Author(s):  
M. M. Chili ◽  
V. S. R. Rajasekhar Pullabhotla ◽  
N. Revaprasadu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Uv Irradiation ◽  
Hybrid Nanostructures ◽  
Hybrid Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Xrd Studies

We report the synthesis of PVP-capped Au-CdSe hybrid nanostructures synthesized using the UV-irradiation method. The high resolution transmission electron microscopy (HRTEM) and powder X-ray diffraction (XRD) studies confirm the presence of the hybrid gold and CdSe nanoparticles.

A new method for analysing peak broadening caused by compositional fluctuation in X-ray diffraction measurements

2001 ◽  
Vol 34 (6) ◽  
pp. 681-690
Author(s):  
Kiichi Nakashima ◽  
Yoshihiro Kawaguchi
Keyword(s):  
New Method ◽  
Theoretical Formula ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compositional Fluctuation ◽  
Zinc Blende ◽  
Difference Variable ◽  
Peak Broadening ◽  
New Criterion ◽  
Zinc Blende Structure

A new method for analysing X-ray peak broadening caused by compositional fluctuation is proposed. The method is applicable to epitaxial layers with diamond or zinc-blende structure on (001) substrates. In the new method, a rescaling procedure with a difference variable ΔAis applied to measured X-ray profiles and the dependence of the profiles on various reflection indiceshklis analysed. The theoretical formula reveals that X-ray peak profiles become independent ofhklafter the rescaling. A new criterion is proposed; an experimental examination based on the criterion makes it possible simply to judge whether or not X-ray peak broadening is caused by compositional fluctuation. The method is verified experimentally and demonstrated by applying it to an InGaAs multilayer sample having artificial compositional fluctuation.

Cleavage and Twinning in CuInSe2 Crystals

1997 ◽  
Vol 53 (4) ◽  
pp. 620-630 ◽  
Author(s):  
Z. A. Shukri ◽  
C. H. Champness
Keyword(s):  
Single Crystals ◽  
Microscopic Examination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cubic Lattice ◽  
Vertical Bridgman Method ◽  
Angle Measurements ◽  
Zinc Blende ◽  
Copper Indium ◽  
Vertical Bridgman

A study was made of the cleavage and twinning character in single crystals of the chalcopyrite CuInSe2, copper indium diselenide, grown in the laboratory by a vertical Bridgman method. In this material, with a c/a ratio of 2.006, the two main cleavage orientations were found to be {101} and {112} (corresponding to the descriptions {201} and {111}, respectively, in a cubic lattice). The plane identifications were made by measuring angles between adjacent cleaved surfaces and verifying the orientations by X-ray Laue and diffractometry. Cleavage was also found less frequently in a {110} plane, but here microscopic examination of the surface revealed it to consist of ridges in a <110> direction, where the microplanes on either side of the ridge edge were {112} planes. Twinning in the grown crystals was found, by angle measurements and X-ray diffraction, to occur along {112} planes, which is similar to the result in face-centred cubic, diamond and zinc blende lattices, where they are the corresponding {111} planes.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Sign in / Sign up

Export Citation Format

Share Document