The Experts below are selected from a list of 47424 Experts worldwide ranked by ideXlab platform
Alf Mews - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
ChemInform, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70-85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal stability of the multishell particles.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
Journal of the American Chemical Society, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70−85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal...
Renguo Xie - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
ChemInform, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70-85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal stability of the multishell particles.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
Journal of the American Chemical Society, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70−85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal...
Thomas Basche - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
ChemInform, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70-85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal stability of the multishell particles.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
Journal of the American Chemical Society, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70−85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal...
Ute Kolb - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
ChemInform, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70-85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal stability of the multishell particles.
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synthesis and characterization of highly luminescent cdse core cds zn0 5cd0 5s zns multishell nanocrystals
Journal of the American Chemical Society, 2005Co-Authors: Renguo Xie, Ute Kolb, Thomas Basche, Alf MewsAbstract:We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the Radial Direction. Because of the stepwise adjustment of the lattice parameters in the Radial Direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the Radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70−85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal...
John P Wolf - One of the best experts on this subject based on the ideXlab platform.
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semi analytical representation of stress singularities as occurring in cracks in anisotropic multi materials with the scaled boundary finite element method
Computers & Structures, 2002Co-Authors: Chongmin Song, John P WolfAbstract:The scaled boundary finite-element method, a semi-analytical boundary-element method based on finite elements, is applied to fracture mechanics problems. Only the actual boundary of the body, but not the straight crack faces and material interfaces passing through the crack tip, is spatially discretized with finite elements, leading to a reduction of the spatial dimension by one. In the Radial Direction the displacements follow from the analytical solution without any a priori assumption. The boundary condition on the crack faces and material interfaces are satisfied exactly. In this boundary-element method based on finite elements, no fundamental solution is required, which permits an efficient analysis of anisotropic material and avoids singular integrals. The scaled boundary finite-element method thus permits an accurate representation of singularities in the Radial Direction using analytical functions.
