87 research outputs found
Optical Study of GaAs quantum dots embedded into AlGaAs nanowires
We report on the photoluminescence characterization of GaAs quantum dots
embedded into AlGaAs nano-wires. Time integrated and time resolved
photoluminescence measurements from both an array and a single quantum
dot/nano-wire are reported. The influence of the diameter sizes distribution is
evidenced in the optical spectroscopy data together with the presence of
various crystalline phases in the AlGaAs nanowires.Comment: 5 page, 5 figure
Stoichiometry and absolute atomic concentration profiles obtained by combined Rutherford backscattering spectroscopy and secondary-ion mass spectroscopy: InAs nanocrystals in Si
Abstract Rutherford backscattering spectroscopy (RBS) and secondary-ion mass spectroscopy (SIMS) were combined to achieve depth profiling calibrated in absolute atomic concentrations. This method was applied to InAs nanocrystals, grown by molecular beam epitaxy (MBE), buried in a Si matrix. By means of RBS, with its capability of accessing the buried layers, we determined the depth-integrated areal densities of As and In. These were used to calibrate the SIMS profiles with their high depth resolution and dynamic range in absolute atomic concentrations. This allowed us to identify, besides a well confined layer of stoichiometric InAs nanocrystals, significant diffusion of In and As into the Si matrix in despite of their larger atomic radii, and an excess of As due to its non-reactive deposition on Si from the excess As 4 flux during the MBE growth. On the basis of these findings, we suggest measures to optimize the MBE process for InAs/Si and similar systems
CCDC 1423720: Experimental Crystal Structure Determination
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures
CCDC 1423719: Experimental Crystal Structure Determination
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures
Selective gas adsorption in microporous metal-organic frameworks incorporating urotropine basic sites: An experimental and theoretical study
Urotropine-based porous coordination polymers with free N-donors demonstrate selective adsorption towards acidic gas substrates (C2H2 or CO2) as confirmed by isotherm measurements and ab initio DFT calculations.</p
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