CE characterization of semiconductor nanocrystals encapsulated with amorphous silicium dioxide

2008 ◽  
Vol 29 (3) ◽  
pp. 576-589 ◽  
Author(s):  
Ute Pyell
Keyword(s):  
Semiconductor Nanocrystals ◽  
Silicium Dioxide

scholarly journals A NewIn VivoModel System to Assess the Toxicity of Semiconductor Nanocrystals

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Angela Tino ◽  
Alfredo Ambrosone ◽  
Lucia Mattera ◽  
Valentina Marchesano ◽  
Andrei Susha ◽  
...  
Keyword(s):  
Semiconductor Nanocrystals ◽  
Minimal Risk ◽  
The Novel ◽  
Toxicological Evaluation ◽  
Hydra Vulgaris ◽  
Population Growth Rates ◽  
Single Structure

In the emerging area of nanotechnology, a key issue is related to the potential impacts of the novel nanomaterials on the environment and human health, so that this technology can be used with minimal risk. Specifically designed to combine on a single structure multipurpose tags and properties, smart nanomaterials need a comprehensive characterization of both chemicophysical properties and adequate toxicological evaluation, which is a challenging endeavour; thein vitrotoxicity assays that are often employed for nanotoxicity assessments do not accurately predictin vivoresponse. To overcome these limitations and to evaluate toxicity characteristics of cadmium telluride quantum dots in relation to surface coatings, we have employed the freshwater polypHydra vulgarisas a model system. We assessedin vivoacute and sublethal toxicity by scoring for alteration of morphological traits, population growth rates, and influence on the regenerative capabilities providing new investigation clues for nanotoxicology purposes.

scholarly journals Elaboration and Characterization of AuCl Semiconductor Nanocrystals Embedded in KCL Single Crystals

2012 ◽  
Vol 03 (07) ◽  
pp. 534-537 ◽  
Author(s):  
Fouzia Zehani ◽  
Miloud Sebais ◽  
Hanane Zaioune
Keyword(s):  
Single Crystals ◽  
Semiconductor Nanocrystals

Synthesis and Characterization of Cu2FeSnS4 Semiconductor Nanocrystals with Zincblende Structure

2012 ◽  
Vol 512-515 ◽  
pp. 2019-2022 ◽  
Author(s):  
Xiao Lu Liang ◽  
Xian Hua Wei
Keyword(s):  
Random Distribution ◽  
Semiconductor Nanocrystals ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nir Absorption ◽  
Average Size

Cu2FeSnS4semiconductor nanocrystals with zincblende structure have been successfully synthesized by a hot-injection approach. Cu+, Fe2+, and Sn4+cations have a random distribution in the zincblende unit cell, and the occupancy possibilities are 1/2, 1/4 and 1/4, respectively. Those nanocrystals were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy dispersive spectroscopy (EDS), and UV-Vis-NIR absorption spectroscopy. The Cu2FeSnS4 nanocrystals have an average size of 7.5 nm and a band gap of 0.92 eV.

scholarly journals One-pot synthesis and characterization of InP/ZnSe semiconductor nanocrystals

2013 ◽  
Vol 95 ◽  
pp. 37-39 ◽  
Author(s):  
Paul Mushonga ◽  
Martin O. Onani ◽  
Abram M. Madiehe ◽  
Mervin Meyer
Keyword(s):  
Semiconductor Nanocrystals ◽  
Synthesis And Characterization ◽  
One Pot ◽  
One Pot Synthesis

Synthesis and characterization of hybrid CdS/MEH-PPV nanocomposites for photovoltaic applications

2011 ◽  
Vol 1322 ◽  
Author(s):  
Anna M. Laera ◽  
Vincenzo Resta ◽  
Emanuela Piscopiello ◽  
Monica Schioppa ◽  
Leander Tapfer
Keyword(s):  
Annealing Temperature ◽  
Particle Density ◽  
Semiconductor Nanocrystals ◽  
Semiconducting Polymer ◽  
High Particle ◽  
Photovoltaic Applications ◽  
The Matrix ◽  
Synthesis Procedure ◽  
Very High

ABSTRACTInorganic-organic nanocomposites, with II-VI or III-V semiconductor nanocrystals (NCs) embedded in semiconducting polymer matrix, are very promising materials for photovoltaic applications.Here, we present an effective and easy synthesis procedure to obtain a hybrid nanocomposite with CdS NCs dispersed in poly[2-methoxy-5-(2-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) conjugated polymer. CdS NCs are synthesized directly within the matrix through the decomposition of a suitable unimolecular precursor dispersed homogeneously in the polymer.We show that CdS NCs are formed at low annealing temperature avoiding structural damages and without affecting the functional properties of the MEH-PPV polymer. The NCs diameter ranges between 1.5nm and 4nm depending on the annealing temperature. In addition, no coalescence phenomena of CdS NCs were noticed in TEM observations even at very high particle density (40 wt %).

Synthesis and Characterization of III-V Rod Shape Semiconductor Nanocrystals

2005 ◽  
Vol 494 ◽  
pp. 121-128
Author(s):  
J.M. Nedeljković ◽  
O.I. Mićić ◽  
S.P. Ahrenkiel ◽  
A.J. Nozik
Keyword(s):  
Size Distribution ◽  
Semiconductor Nanocrystals ◽  
Synthesis And Characterization ◽  
Lateral Growth ◽  
Narrow Size Distribution ◽  
Free Standing ◽  
Quantum Rods ◽  
Metallic Catalyst ◽  
Strong Confinement

InP and InAs quantum rods were synthesized via the reactions of monodispersed indium droplets with phosphide or arsenide ions, respectively. In these reactions indium droplets, which do not act as a catalyst but rather as a reactant, are completely consumed. For the synthesis of InP and InAs quantum rods with a narrow size distribution, a narrow size distribution of indium particles is required because each indium droplet serves as a template to strictly limit the lateral growth of individual InP or InAs nanocrystals. Free-standing InP (130 Å diameter and 870 Å length) and InAs (180 Å diameter and 745 Å length) quantum rods without residual metallic catalyst at the rod tip were synthesized from the diluted transparent solutions of metallic indium. Both kinds of synthesized nanorods are in the strong confinement regime since the Bohr diameters of InP and InAs are 200 and 700 Å, respectively.

Synthesis and Electrical Characterization of a MOS Memory Containing Pt Nanoparticles Deposited at a SiO2/ HfO2 Interface

2004 ◽  
Vol 830 ◽  
Author(s):  
Ch. Sargentis ◽  
K. Giannakopoulos ◽  
A. Travlos ◽  
D. Tsamakis
Keyword(s):  
High Frequency ◽  
Semiconductor Nanocrystals ◽  
Electrical Characterization ◽  
Pt Nanoparticles ◽  
Memory Device ◽  
Memory Devices ◽  
High K ◽  
High K Dielectric ◽  
Mos Device

ABSTRACTMOS memory devices containing semiconductor nanocrystals have drawn considerable attention recently, due to their advantages when compared to the conventional memories. Only little work has been done on memory devices containing metal nanoparticles.We describe the fabrication of a novel MOS device with embedded Pt nanoparticles in the HfO2 / SiO2 interface of a MOS device. Using as control oxide, a high-k dielectric, our device has a great degree of scalability. The fabricated nanoparticles are very small (about 5 nm) and have high density. High frequency C-V measurements demonstrate that this device operates as a memory device.

scholarly journals Preparation and Characterization of Various Surface-modified Semiconductor Nanocrystals

2009 ◽  
Vol 30 (12) ◽  
pp. 3137-3140 ◽  
Author(s):  
Hwa-Sung You ◽  
Kang-Sik Choi ◽  
Pan-Kee Bae ◽  
Kyung-Nam Kim ◽  
Ho-Gyeom Jang ◽  
...  
Keyword(s):  
Semiconductor Nanocrystals ◽  
Surface Modified

Photon and Electron Beam Induced Phase Transformations in CDS Nanocrystals

2000 ◽  
Vol 6 (S2) ◽  
pp. 18-19
Author(s):  
M. Gajdardziska-Josifovska ◽  
V. Lazarov ◽  
J. Reynolds ◽  
V. V. Yakovlev
Keyword(s):  
Phase Transformations ◽  
Semiconductor Nanocrystals ◽  
Wavelength Dependence ◽  
Colloidal Solutions ◽  
Chemical Methods ◽  
Wet Chemistry ◽  
Cds Nanocrystals ◽  
Physical And Chemical ◽  
532 Nm

One of the great challenges of nanotechnology is how to produce and modify objects at nanoscale dimensions. The search for physical and chemical methods for controlled synthesis, modification and characterization of semiconductor nanocrystals is of special interest due to their novel electronic and optical properties. Recently we have achieved the first laser-induced phase transformation in semiconductor nanocrystals [1], irradiating colloidal solutions of CdS nanocrystals with 7 ns pulses of 532 nm wavelength. We used established wet-chemistry methods to synthesize the CdS nanocrystals, and a combination of electron microscopy methods to determine the structure, size and composition of the nanocrystals. In the present paper we report a wavelength dependence of the laser-induced phase transformations in CdS. We also explore electron-induced transformations in comparison with their photon counterparts.Aqueous colloidal solutions of CdS nanocrystals were prepared by mixing of CdCl2 with Na2S in the presence of Sodium Mercaptoacetate and HC1 [2].

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