Cadmium Telluride Quantum Dots

Among nanomaterials, CdTe holds special technological importance as the only known II-VI material that can form conventional p-n junctions. This makes CdTe very important for the dev

Cadmium Telluride Quantum Dots

Author: John Donegan

Publisher: CRC Press

ISBN: 9814316091

Page: 248

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In the last two decades, semiconductor quantum dots—small colloidal nanoparticles—have garnered a great deal of scientific interest because of their unique properties. Among nanomaterials, CdTe holds special technological importance as the only known II–VI material that can form conventional p–n junctions. This makes CdTe very important for the development of novel optoelectronic devices such as light-emitting diodes, solar cells, and lasers. Moreover, the demand for water-compatible light emitters and the most common biological buffers give CdTe quantum dots fields a veritable edge in biolabeling and bioimaging. Cadmium Telluride Quantum Dots: Advances and Applications focuses on CdTe quantum dots and addresses their synthesis, assembly, optical properties, and applications in biology and medicine. It makes for a very informative reading for anyone involved in nanotechnology and will also benefit those scientists who are looking for a comprehensive account on the current state of quantum dot–related research.

The Anticoagulant Properties of Cadmium Telluride Quantum Dots

Abstract: The size‐dependent optical properties of quantum dots (QDs) are frequently exploited for use in medical imaging and labelling applications.

The Anticoagulant Properties of Cadmium Telluride Quantum Dots

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Abstract: The size‐dependent optical properties of quantum dots (QDs) are frequently exploited for use in medical imaging and labelling applications. Similarly, presented here, they also elicit profound size‐dependent anticoagulant properties. Cadmium telluride quantum dot (QDs) (3.2nm) were shown to have a dramatic anticoagulant effect centred on around the intrinsic coagulation pathway, compared to their 3.6 nm counterparts. Several clinically relevant diagnostic tests were carried out over a concentration range of the QDs and demonstrated that the 3.2 nm QDs elicited their response on the intrinsic pathway as a whole, yet the activity of the individual intrinsic coagulation factors was not affected. The mechanism appears also to be strongly influenced by the concentration of calcium ions and not cadmium ions leached from the QDs. Static and shear‐based primary haemostasis assays were also carried out, demonstrating a profound anticoagulant effect which was independent of platelets and phospholipids. The data presented here suggest that the physical–chemical properties of the QDs may have a role in the modulation of haemostasis and the coagulation cascade, in a yet not fully understood mechanism. This study has implications for the use of similar QDs as diagnostic or therapeutic tools in vivo, and for the occupational health and safety of those working with such materials. Abstract : Cadmium telluride quantum dots (3.2nm) exhibit a profound anticoagulant response centred on the intrinsic pathway. The mechanism appears also to be strongly influenced by the concentration of calcium ions and not the presence of cadmium ions.

Semiconductor Quantum Dots in Glasses

The average size was quite close to the predicted exciton Bohr - radius of CdTe (
Table 3.4 ) . The size distribution was unimodal with lower and upper limits of
approximately 7 and 22 nm respectively . These CdTe quantum dots were ...

Semiconductor Quantum Dots in Glasses

Author: Li-Chi John Liu

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Page: 332

View: 368

Environmental Health Perspectives

Differences in subcellular distribution and toxicity of green and red emitting CdTe
quantum dots . J Mol Med 83 : 377-385 . Lovric J , Cho SJ , Winnik FM ,
Maysinger D. 2005b . Unmodified cadmium telluride quantum dots induce
reactive ...

Environmental Health Perspectives

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Nanobiophotonics and Biomedical Applications

Cadmium telluride ( CdTe ) quantum dots , with a diameter of approximately 3nm
, were synthesized then rendered water ... CdTe quantum dots may be imaged
and excited at nearinfrared wavelengths , depending on the size of the dot . CdTe
 ...

Nanobiophotonics and Biomedical Applications

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Opto Ireland 2002

Size selective photoluminescence excitation spectroscopy in CdTe quantum dots
Yury Rakovich - , Laura Walsho , Louise Bradley , John F . Donegano , Dmitri
Talapin " , Andrey Rogacho , Alexander Eychmüller " Semiconductor Photonics ...

Opto Ireland 2002

Author: Werner J. Blau

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Page: 1398

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Journal of the Physical Society of Japan

Optical Study of Phonon - Mediated Carrier Relaxation in CdTe / ZnTe Self -
Assembled Quantum Dots Tsuyoshi OKUNO * , Mitsuhiro NOMURA ' , Yasuaki
MASUMOTO , Yoshikazu TERAI ! " , Shinji KURODA ' , and Kôki TAKITA ' Institute
of ...

Journal of the Physical Society of Japan

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Science Abstracts

... system monitoring for the growth of CdTe / ZnTe / GaAs / Si for mercury
cadmium telluride epitaxy 64276 Irvine , S.J.C. ... Suwa , F. Transport through
discrete energy levels in quantum dots 86393 Isawa , Y. see Hatano , T. 86988
Isayama ...

Science Abstracts

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Microcrystalline and Nanocrystalline Semiconductors 1998

OPTICAL AND ELECTRICAL PROPERTIES OF CdTe NANOCRYSTAL
QUANTUM DOTS PASSIVATED IN AMORPHOUS Ti02 THIN FILM MATRIX A. C.
RASTOGI*. S. N. SHARMA AND SANDEEP KOHLI Division of Electronic
Materials, ...

Microcrystalline and Nanocrystalline Semiconductors   1998

Author: Leigh T. Canham

Publisher: Materials Research Society

ISBN:

Page: 569

View: 652

The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners. This volume was first published in 1999.

Japanese Journal of Applied Physics

The ultrafast electron dynamics of bulk CdTel.2 ) and quantum dots ) have been
studied extensively , since CdTe represents the telluride group and can be
associated with the semimetal HgTe and the semimagnetic CdMnTe . Recently it
 ...

Japanese Journal of Applied Physics

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JJAP

Excitonic Luminescence from Self - Organized Quantum Dots of CdTe Grown by
Molecular Beam Epitaxy Shinji KURODA ... Atomic force microscopy
measurements of the uncapped samples revealed the formation of CdTe QDs
with typical dot ...

JJAP

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Journal

A key concept is that the quantum dot composition is determined only by the
relative formation rates of CdSe and CdTe , not by the absolute cadmium
concentration . The reason is that cadmium is a common species in both CdSe
and CdTe ...

Journal

Author: American Chemical Society

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Physics Briefs

... films prepared by spray pyrolysis 22-111774 CADMIUM SULFIDES : two -
photon spectra Two - photon spectroscopy of CdS quantum dots 16-91460
CADMIUM TELLURIDE SOLAR CELLS : fabrication Thin - film Cds / CdTe solar
cell with ...

Physics Briefs

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