Transparent Medium Embedded with CdS Quantum Dots for X‐Ray Imaging

2021 ◽  
pp. 2101607
Author(s):  
Zhaohui Fang ◽  
Haitao Tang ◽  
Ze Yang ◽  
Hao Zhang ◽  
Qingpeng Peng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transparent Medium ◽  
Cds Quantum Dots ◽  
X Ray ◽  
X Ray Imaging

Study of CdSe/CdS quantum dots in solutions and gels by small-angle X-ray scattering

2011 ◽  
Vol 5 (1) ◽  
pp. 126-133 ◽  
Author(s):  
N. B. Simonova ◽  
F. V. Tuzikov ◽  
R. N. Khramov ◽  
N. A. Tuzikova ◽  
M. F. Tuzikov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Small Angle ◽  
Cds Quantum Dots ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

X-ray total scattering study of magic-size clusters and quantum dots of cadmium sulphide

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21900-21908 ◽  
Author(s):  
Lei Tan ◽  
Alston J. Misquitta ◽  
Andrei Sapelkin ◽  
Le Fang ◽  
Rory M. Wilson ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Distribution Function ◽  
Pair Distribution Function ◽  
Function Analysis ◽  
Cadmium Sulphide ◽  
Cds Quantum Dots ◽  
Total Scattering ◽  
X Ray ◽  
Scattering Study

Four types of magic-size CdS clusters and three different CdS quantum dots have been studied using the technique of X-ray total scattering and pair distribution function analysis.

The formation of CdS quantum dots and Au nanoparticles

2017 ◽  
Vol 232 (1-3) ◽  
Author(s):  
Andreas Schiener ◽  
Ella Schmidt ◽  
Christoph Bergmann ◽  
Soenke Seifert ◽  
Dirk Zahn ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Au Nanoparticles ◽  
Early Stage ◽  
Reaction Times ◽  
Cds Quantum Dots ◽  
Saxs Data ◽  
X Ray ◽  
Free Jet ◽  
In The Beginning

AbstractWe report on microsecond-resolved in-situ SAXS experiments of the early nucleation and growth behavior of both cadmium sulfide (CdS) quantum dots in aqueous solution including the temperature dependence and of gold (Au) nanoparticles. A novel free-jet setup was developped to access reaction times as early as 20 μs. As the signal in particular in the beginning of the reaction is weak the containment-free nature of this sample environment prooved crucial. The SAXS data reveal a two-step pathway with a surprising stability of a structurally relaxed cluster with a diameter of about 2 nm. While these develop rapidly by ionic assembly, a further slower growth is attributed to cluster attachment. WAXS diffraction confirms, that the particles at this early stage are not yet crystalline. This growth mode is confirmed for a temperature range from 25°C to 45°C. An energy barrier for the diffusion of primary clusters in water of 0.60 eV was experimentally observed in agreement with molecular simulations. To access reaction times beyond 100 ms, a stopped-drop setup -again contaiment- free is introduced. SAXS experiments on the growth of Au nanoparticles on an extended time scale provide a much slower growth with one population only. Further, the influence of ionizing X-ray radiation on the Au particle fromation and growth is discussed.

The fate of CdS quantum dots in plants as revealed by extended X-ray absorption fine structure (EXAFS) analysis

2020 ◽  
Vol 7 (4) ◽  
pp. 1150-1162
Author(s):  
Marta Marmiroli ◽  
Giovanni Orazio Lepore ◽  
Luca Pagano ◽  
Francesco d'Acapito ◽  
Alessandra Gianoncelli ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fine Structure ◽  
Potential Risk ◽  
Cds Quantum Dots ◽  
X Ray ◽  
Exafs Analysis ◽  
Absorption Fine ◽  
X Ray Absorption

The use of quantum dots (QDs) is widespread and as such, the potential risk associated with their dispersion in the environment has stimulated research on their interaction with potential sensitive receptors.

The Structural Characteristics Features of the Nanocomposite Systems of CdS Quantum Dots in the Gel Matrix Obtained by the Method of Small-Angle X-Ray Scattering

2014 ◽  
Vol 213 ◽  
pp. 216-221
Author(s):  
Anna N. Galkina ◽  
Alexander A. Sergeev
Keyword(s):  
Quantum Dots ◽  
Small Angle ◽  
Structural Characteristics ◽  
Data Interpretation ◽  
Cds Quantum Dots ◽  
Particle Structure ◽  
Saxs Data ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

The strucrture of CdS quantum dots 0,3% (mass), stabilized by the solution of the mercaptosuccinic acid in the gel matrix 50% THEOS is investigated by small-angle X-ray scattering (SAXS). Application of modern methods of SAXS data interpretation, including procedure of ab initio modeling of particle structure, allowed us for the to reveal structural organization of both individual nanoparticles and of their clusters incorporated in the polymer matrix. As a result, the shape, size, and size distribution of the obtained nanoparticles and their clusters depended on the structure of the gel matrix used as a formation medium.

Grazing incidence small-angle X-ray scattering studies of the synthesis and growth of CdS quantum dots from constituent atoms in SiO2matrix

2003 ◽  
Vol 36 (3) ◽  
pp. 443-446 ◽  
Author(s):  
U.V. Desnica ◽  
P. Dubček ◽  
I.D. Desnica-Frankovic ◽  
M. Buljan ◽  
S. Bernstorff ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Small Angle ◽  
Grazing Incidence ◽  
Cds Quantum Dots ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Defects of Platelet Function Recognized by X-Ray Imaging and Scanning Electron Microscopy

1985 ◽  
Vol 43 ◽  
pp. 610-613
Author(s):  
M.G. Baldini ◽  
S. Morinaga ◽  
D. Minasian ◽  
R. Feder ◽  
D. Sayre ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cell Biology ◽  
Imaging Technique ◽  
Human Platelets ◽  
X Rays ◽  
X Ray ◽  
X Ray Imaging ◽  
Complex Phenomena ◽  
Scanning Electron

Contact X-ray imaging is presently developing as an important imaging technique in cell biology. Our recent studies on human platelets have demonstrated that the cytoskeleton of these cells contains photondense structures which can preferentially be imaged by soft X-ray imaging. Our present research has dealt with platelet activation, i.e., the complex phenomena which precede platelet appregation and are associated with profound changes in platelet cytoskeleton. Human platelets suspended in plasma were used. Whole cell mounts were fixed and dehydrated, then exposed to a stationary source of soft X-rays as previously described. Developed replicas and respective grids were studied by scanning electron microscopy (SEM).

Designing high-resolution slow scan CCD-based TEM camera systems

1992 ◽  
Vol 50 (2) ◽  
pp. 946-947
Author(s):  
James F. Mancuso ◽  
William B. Maxwell ◽  
Russell E. Camp ◽  
Mark H. Ellisman
Keyword(s):  
Fiber Optics ◽  
Ccd Camera ◽  
High Energy ◽  
Phosphor Layer ◽  
X Ray ◽  
Light Production ◽  
Camera Systems ◽  
X Ray Imaging ◽  
Electron Image ◽  
Scintillating Fiber

The imaging requirements for 1000 line CCD camera systems include resolution, sensitivity, and field of view. In electronic camera systems these characteristics are determined primarily by the performance of the electro-optic interface. This component converts the electron image into a light image which is ultimately received by a camera sensor.Light production in the interface occurs when high energy electrons strike a phosphor or scintillator. Resolution is limited by electron scattering and absorption. For a constant resolution, more energy deposition occurs in denser phosphors (Figure 1). In this respect, high density x-ray phosphors such as Gd2O2S are better than ZnS based cathode ray tube phosphors. Scintillating fiber optics can be used instead of a discrete phosphor layer. The resolution of scintillating fiber optics that are used in x-ray imaging exceed 20 1p/mm and can be made very large. An example of a digital TEM image using a scintillating fiber optic plate is shown in Figure 2.

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