Results 211 to 220 of about 1,293,225 (284)

Two-Photon Photochemistry of CdSe Quantum Dots

ACS Nano, 2015
The two-photon photochemistry of CdSe quantum dots (QDs) has been systematically studied. We find that upon intense irradiation CdSe quantum dots that absorb two or more visible photons undergo photodarkening. The quantum yield for this process is on the order of 6% in chloroform and much smaller in nonpolar solvents, such as octane. An analysis of the
Youhong, Zeng, David F, Kelley
openaire   +2 more sources

Midinfrared Electroluminescence from CdSe Quantum Dots

ACS Nano
Midinfrared electroluminescence from the electron intraband transition is demonstrated with intrinsic CdSe colloidal quantum dots. The device consists of a thin film of CdSe dots and a layer of ZnO nanocrystals, sandwiched between two electrodes that enhance light outcoupling at 5 μm.
Philippe Guyot-Sionnest, Xingyu Shen
exaly   +3 more sources

Switching-on Superparamagnetism in Mn/CdSe Quantum Dots

Journal of the American Chemical Society, 2006
Mn ion doping of CdSe and other semimagnetic quantum dot (QDs) alloys has been an area of active speculation for over a decade. We report evidence of Mn(II) doping of CdSe grown from a cubic single source precursor that is superparamagnetic (SPM) with a blocking temperature of 40 K following thermal annealing.
Donny, Magana, Susanthri C, Perera, Andrew G, Harter, Naresh S, Dalal, Geoffrey F, Strouse   +4 more
openaire   +2 more sources

Amphoteric CdSe nanocrystalline quantum dots

Nanotechnology, 2008
The nanocrystal quantum dot (NQD) charge states strongly influence their electrical transport properties in photovoltaic and electroluminescent devices, optical gains in NQD lasers, and the stability of the dots in thin films. We report a unique electrostatic nature of CdSe NQDs, studied by electrophoretic methods.
openaire   +2 more sources

The Effects of Chemisorption on the Luminescence of CdSe Quantum Dots

Langmuir, 2006
We report on the effects of Lewis bases and other ligands on radiative recombination in CdSe quantum dots (QDs) in several solvents. Long-chain primary amines are found to be the most efficacious capping agents for CdSe QDs in nonpolar solvents. Primary alkylamines are superior to secondary and tertiary alkylamines.
C, Bullen, P, Mulvaney
openaire   +2 more sources

Probing cytotoxicity of CdSe and CdSe/CdS quantum dots

Chinese Chemical Letters, 2011
Abstract Toxicities of CdSe and CdSe/CdS quantum dots (QDs) synthesized by ultrasound-assisted methods were investigated in vitro and in vivo. Five human cell lines were used to assess the cytotoxicity of as-prepared CdSe and CdSe/CdS by assays of MTT viability, red blood cell hemolysis, flow cytometry, and fluorescence imaging. The results show that
Yan Jie Bao, Jun Jun Li, Yi Ting Wang, Lei Yu, Lei Lou, Wei Ji Du, Zi Qiang Zhu, Hui Peng, Jian Zhong Zhu   +8 more
openaire   +1 more source

Switching CdSe quantum dot luminescence with a-Si:H

Nanotechnology, 2013
Dynamical control of the luminescence of quantum dots is highly important for technology in the field of telecommunication, displays, and photovoltaics. In this work we use an a-Si:H solar cell structure in which CdSe quantum dots are sandwiched.
M. Di Vece, S. N. F. Van Duren, D. J. Van Den Heuvel, D. Mitoraj, Y. Kuang, H. C. Gerritsen, R. E. I. Schropp   +6 more
openaire   +4 more sources

Quantum Confinement Effects in CdSe Quantum Dots

The Journal of Physical Chemistry, 1995
The energies of the lowest excited state of hexagonal and zinc-blende CdSe spherical quantum dots are calculated using empirical pseudopotentials of the bulk semiconductor. The lowest excited state energies computed for hexagonal clusters are in reasonable agreement with recent experiments. We predict that zinc-blende and hexagonal dots have nearly the
B. Zorman, M. V. Ramakrishna, R. A. Friesner   +2 more
openaire   +1 more source

Thioglycerol-functionalized CdSe quantum dots detecting cadmium ions

, 2015
Water-soluble CdSe quantum dots (QDs) were synthesized using thioglycerol (TG) as the surface capping agent through a one-step process at low temperature T (100 °C).
N. ben Brahim, N. B. H. Mohamed, M. Echabaane, M. Haouari, R. Ben Chaâbane, M. Négrerie, H. Ben Ouada   +6 more
semanticscholar   +1 more source

Hydrophilization of CdSe quantum dots with surfactants

Colloid Journal, 2013
A procedure has been developed for hydrophilization of CdSe semiconductor quantum dots with anionic, cationic, and nonionic surfactants. Depending on the type of a surfactant, these particles may carry positive, negative, or no charges. In spite of the universality of the proposed procedure, the hydrophilization with specific surfactants must be ...
M. G. Spirin, S. B. Brichkin, V. F. Razumov   +2 more
openaire   +1 more source