Results 201 to 210 of about 1,293,225 (284)

Observation of the "Dark exciton" in CdSe quantum dots.

Physical Review Letters, 1995
We use external magnetic fields to identify the band edge emitting state in CdSe quantum dots. The field dependence of emission decays and LO phonon spectra show the importance of exciton spin dynamics in the recombination mechanism. To interpret our results we calculate the band edge exciton structure, including the effects of the electron-hole ...
M. Nirmal, D. Norris, M. Kuno, M. Bawendi, A. Efros, M. Rosen   +5 more
semanticscholar   +3 more sources

Preparation of CdSe Quantum Dots and Characterization of Single CdSe Quantum Dots

2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006
The photoluminescence of CdSe quantum dots with different diameter were studied in toluene and on silicon substrate. Single CdSe quantum dot was prepared through a simple method, which was conformed by AFM images.
J. Bao, Y Shen, T.X. Li, J. Wu, N. Dai
openaire   +1 more source

CdSe quantum dots in a columnar matrix

Chemical Communications, 2011
Cadmium selenide quantum dots (QDs) have been dispersed in a discotic liquid crystal columnar matrix. Thermophysical properties of these liquid crystal nanocomposites were investigated by UV-Vis spectroscopy, photoluminescence spectroscopy, differential scanning calorimetry, polarizing optical microscopy, DC conductivity and small angle X-ray ...
Sandeep, Kumar, Laxmi Kishore, Sagar
openaire   +2 more sources

Visible-light-driven CdSe quantum dots/graphene/TiO2 nanosheets composite with excellent photocatalytic activity for E. coli disinfection and organic pollutant degradation

Applications of Surface Science, 2018
Ternary CdSe quantum dots (QDs)/graphene/TiO2 nanosheet composite photocatalysts were synthesized through precipitation by using hydrothermally prepared layered TiO2 nanosheets/graphene sheets as supporting matrix and CdSe QDs solution as precursor ...
Xiyang Ma, Quanjun Xiang, Yu-Long Liao, Tian-Long Wen, Huai-Wu Zhang   +4 more
semanticscholar   +1 more source

Insights into the synergy effect of anisotropic {001} and {230}facets of BaTiO3 nanocubes sensitized with CdSe quantum dots for photocatalytic water reduction

Applied Catalysis B: Environmental, 2018
A novel kind of nanocomposites consisted of CdSe quantum dots (QDs) sensitized BaTiO3 nanocudes was successfully synthesized by facile hydrothermal and chemical bath methods to investigate the synergy effect of isotropic {001} facets and anisotropic ...
D. Zhong, Wen-Wen Liu, Peng-Fei Tan, An-Quan Zhu, Yi Liu, X. Xiong, Jun Pan   +6 more
semanticscholar   +1 more source

Excitons in CdSe quantum dots

Physical Review B, 1997
Recent advances in material synthesis have provided samples with CdSe quantum dots with a degree of monodispersity high enough to allow for observation of excited exciton states and their size dependence [Norris et al., Phys. Rev. Lett. 72, 2612 (1994)]. Here we report theoretical results for these exciton states using the effective bond-orbital model (
U. E. H. Laheld, G. T. Einevoll
openaire   +1 more source

Electrochemical properties of CdSe and CdTe quantum dots

Chemical Society Reviews, 2012
Semiconductor nanocrystal quantum dots (QDs), owing to their unique opto-electronic properties determined by quantum confinement effects, have been the subject of extensive investigations in different areas of science and technology in the past two decades. The electrochemical behaviour of QDs, particularly for CdSe and CdTe nanocrystals, has also been
AMELIA, MATTEO, LINCHENEAU, CHRISTOPHE, SILVI, SERENA, CREDI, ALBERTO   +3 more
openaire   +3 more sources

CdSe quantum dots sensitized ZnO nanorods for solar cell application

Materials letters (General ed.), 2018
Sol gel dip coating method has been used for preparing ZnO nanorods. ZnO nanorods have been sensitized using CdSe quantum dots by simple chemical method. Uniform coverage of quantum dots on ZnO nanorods is observed. The structural, optical and morphology
D. V. Pandi, N. Muthukumarasamy, S. Agilan, D. Velauthapillai   +3 more
semanticscholar   +1 more source

Electron Counting Spectroscopy of CdSe Quantum Dots

Physical Review Letters, 2009
We report on the electronic properties of semiconducting CdSe quantum dots that can be filled or emptied with many electrons. To accomplish that, we employ a device layout where the investigated quantum dot is attached to only one electrode, a carbon nanotube.
Mariusz, Zdrojek, Maria Jose, Esplandiu, Amelia, Barreiro, Adrian, Bachtold   +3 more
openaire   +2 more sources

Pseudopotential calculations of nanoscale CdSe quantum dots

Physical Review B, 1996
A plane-wave semiempirical pseudopotential method with nonlocal potentials and spin-orbit coupling is used to calculate the electronic structure of surface-passivated wurtzite CdSe quantum dots with up to 1000 atoms. The calculated optical absorption spectrum reproduces the features of the experimental results and the exciton energies agree to within ...
, Wang, , Zunger
openaire   +2 more sources