Synthesis of Mn-doped zinc blende CdSe nanocrystals

2007 ◽  
Vol 90 (17) ◽  
pp. 173111 ◽  
Author(s):  
Woo-Chul Kwak ◽  
Yun-Mo Sung ◽  
Tae Geun Kim ◽  
Won-Seok Chae
Keyword(s):  
Cdse Nanocrystals ◽  
Zinc Blende ◽  
Mn Doped

Synthesis of Mn-doped zinc blende CdSe nanocrystals for quantum dot-sensitized solar cells

2016 ◽  
Vol 42 (7) ◽  
pp. 6255-6263 ◽  
Author(s):  
Bin Bin Jin ◽  
Xiu Wei Wang ◽  
Jun Li Cui ◽  
Li Hua Liu ◽  
Yu Cao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Cdse Nanocrystals ◽  
Zinc Blende ◽  
Sensitized Solar Cells ◽  
Mn Doped

Coarsening Kinetics of Mn-Doped CdSe Nanocrystals

2008 ◽  
Vol 8 (4) ◽  
pp. 1186-1190 ◽  
Author(s):  
Yun-Mo Sung ◽  
Woo-Chul Kwak ◽  
Tae Geun Kim
Keyword(s):  
Cdse Nanocrystals ◽  
Coarsening Kinetics ◽  
Kinetics Of ◽  
Mn Doped

scholarly journals First principle calculations of electronic and magnetic properties of Mn-doped CdS (zinc blende): a theoretical study

2017 ◽  
Vol 35 (3) ◽  
pp. 479-485 ◽  
Author(s):  
Nisar Ahmed ◽  
Azeem Nabi ◽  
Jawad Nisar ◽  
Muhammad Tariq ◽  
Muhammad Arshad Javid ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Density Functional ◽  
Magnetic Moments ◽  
Local Magnetic Moment ◽  
Ferromagnetic Phase ◽  
Generalized Gradient ◽  
Zinc Blende ◽  
Type Semiconductor ◽  
Ferromagnetic Interactions ◽  
Mn Doped

AbstractThe electronic structure and magnetic properties of Mn doped zinc blende cadmium sulfide Cd1-xMnxS (x = 6.25 %) have been studied using spin-polarized density functional theory within the framework of Generalized Gradient Approximation (GGA), its further corrections including Hubbard U interactions (GGA + U) and a model for exchange and correlation potential Tran Blaha modified Becke-Johnson (TB-mBJ). Ferromagnetic interactions have been observed between Mn atoms via S atom due to strong p-d hybridization. The magnetic moments on Mn and its neighboring atoms have also been studied in detail using different charge analysis techniques. It has been observed that p-d hybridization reduced the value of local magnetic moment of Mn in comparison to its free space charge value and produced small local magnetic moments on the nonmagnetic S and Cd host sites. The magnetocrystalline anisotropy in [1 0 0] and [1 1 1] directions as well as exchange splitting parameters Noα and Noβ have been analyzed to confirm that ferromagnetism exists. We conclude that the ferromagnetic phase in Mn-doped CdS is not stable in “near” configuration but it is stable for “far” configuration. Mn doped CdS is a p-type semiconductor and the d-states at the top of the valence band edge give a very useful material for photoluminescence and magneto-optical devices.

scholarly journals Synthesis and Fluorescence Property of Mn-Doped ZnSe Nanowires

2010 ◽  
Vol 2010 ◽  
pp. 1-4 ◽  
Author(s):  
Dongmei Han ◽  
Chunfeng Song ◽  
Xiaoyu Li
Keyword(s):  
Heavy Metal Ions ◽  
Average Length ◽  
Water Soluble ◽  
Absorbance Spectrum ◽  
Zinc Blende ◽  
Single Well ◽  
Znse Nanowires ◽  
Absorbance Peak ◽  
Mn Doped ◽  
Zinc Blende Structure

Water-soluble Mn-doped ZnSe luminescent nanowires were successfully prepared by hydrothermal method without any heavy metal ions and toxic reagents. The morphology, composition, and property of the products were investigated. The experimental results showed that the Mn-doped ZnSe nanowires were single well crystallized and had a zinc blende structure. The average length of the nanowires was about 2-3 μm, and the diameter was 80 nm. With the increase ofMn2+-doped concentration, the absorbance peak showed large difference. The UV-vis absorbance spectrum showed that the Mn-doped ZnSe nanowires had a sharp absorption band appearing at 360 nm. The PL spectrum revealed that the nanowires had two distinct emission bands centered at 432 and 580 nm.

scholarly journals Unraveling the Growth Mechanism of Magic-Sized Semiconductor Nanocrystals

2020 ◽  
Author(s):  
Aniket S. Mule ◽  
Sergio Mazzotti ◽  
Aurelio A. Rossinelli ◽  
Marianne Aellen ◽  
P. Tim Prins ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Surface Reaction ◽  
Size Range ◽  
Semiconductor Nanocrystals ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Cdse Nanocrystals ◽  
Layer By Layer ◽  
Zinc Blende ◽  
Kinetic Barriers

Magic-sized clusters (MSCs) of semiconductor are typically defined as specific molecular-scale arrangements of atoms that exhibit enhanced stability. They often grow in discrete jumps, creating a series of crystallites, without the appearance of intermediate sizes. However, despite their long history, the mechanism behind their special stability and growth remains poorly understood. This is particularly true considering experiments that have shown discrete evolution of MSCs to sizes well beyond the “cluster” regime and into the size range of colloidal quantum dots. Here, we study the growth of these larger magic-sized CdSe nanocrystals to unravel the underlying growth mechanism. We first introduce a synthetic protocol that yields a series of nine magic-sized nanocrystals of increasing size. By investigating these crystallites, we obtain important clues about the mechanism. We then develop a microscopic model that uses classical nucleation theory to determine kinetic barriers and simulate the growth. We show that magic-sized nanocrystals are consistent with a series of zinc-blende crystallites that grow layer by layer under surface-reaction-limited conditions. They have a tetrahedral shape, which is preserved when a monolayer is added to any of its four identical facets, leading to a series of discrete nanocrystals with special stability. Our analysis also identifies strong similarities with the growth of semiconductor nanoplatelets, which we then exploit to increase further the size range of our magic-sized nanocrystals. Although we focus here on CdSe, these results reveal a fundamental growth mechanism that can provide a different approach to nearly monodisperse nanocrystals.

scholarly journals Revealing the Surface Structure of CdSe Nanocrystals by Dynamic Nuclear Polarization-Enhanced 77Se and 113Cd Solid-State NMR Spectroscopy

2021 ◽  
Author(s):  
Yunhua Chen ◽  
Rick Dorn ◽  
Michael Hanrahan ◽  
Lin Wei ◽  
Rafael Blome-Fernandez ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Solid State Nmr ◽  
Nuclear Polarization ◽  
Surface Structures ◽  
Cdse Nanocrystals ◽  
Magic Angle ◽  
Cross Polarization ◽  
Zinc Blende ◽  
Detailed Surface

<p>Dynamic nuclear polarization (DNP) solid-state NMR (SSNMR) spectroscopy was used to obtain detailed surface structures of zinc blende CdSe nanocrystals (NCs) with plate or spheroidal morphologies and which are capped by carboxylic acid ligands. 1D <sup>113</sup>Cd and <sup>77</sup>Se cross-polarization magic angle spinning (CPMAS) NMR spectra revealed distinct signals from Cd and Se atoms on the surface of the NCs, and those residing in bulk-like environments below the surface. <sup>113</sup>Cd cross-polarization magic-angle-turning (CP-MAT) experiments identified CdSe<sub>3</sub>O, CdSe<sub>2</sub>O<sub>2</sub>, and CdSeO<sub>3</sub> Cd coordination environments on the surface of the NCs, where the oxygen atoms are presumably from coordinated carboxylate ligands. The sensitivity gain from DNP enabled natural isotopic abundance 2D homonuclear <sup>113</sup>Cd-<sup>113</sup>Cd and <sup>77</sup>Se-<sup>77</sup>Se and heteronuclear <sup>113</sup>Cd-<sup>77</sup>Se scalar correlation solid-state NMR experiments that reveal the connectivity of the Cd and Se atoms. Importantly, <sup>77</sup>Se{<sup>113</sup>Cd} scalar heteronuclear multiple quantum coherence (<i>J</i>-HMQC) experiments were used to selectively measure one-bond <sup>77</sup>Se-<sup>113</sup>Cd scalar coupling constants (<sup>1</sup><i>J</i>(<sup>77</sup>Se, <sup>113</sup>Cd)). With knowledge of <sup>1</sup><i>J</i>(<sup>77</sup>Se, <sup>113</sup>Cd), heteronuclear <sup>77</sup>Se{<sup>113</sup>Cd} spin echo (<i>J</i>-resolved) NMR experiments were then used to determine the number of Cd atoms bonded to Se atoms and vice versa. The <i>J</i>-resolved experiments directly confirmed that major Cd and Se surface species have CdSe<sub>2</sub>O<sub>2</sub> and SeCd<sub>4</sub> stoichiometries, respectively. Considering the crystal structure of zinc blende CdSe, and the similarity of the solid-state NMR data for the platelets and spheroids, we conclude that the surface of the spheroidal CdSe NCs is primarily composed of {100} facets. The methods outlined here will generally be applicable to obtain detailed surface structures of various main group semiconductors.</p>

Epitaxially grown zinc-blende structured Mn doped ZnO nanoshell on ZnS nanoparticles

2009 ◽  
Vol 44 (2) ◽  
pp. 339-344 ◽  
Author(s):  
Mukta V. Limaye ◽  
Shashi B. Singh ◽  
Sadgopal K. Date ◽  
R.S. Gholap ◽  
Sulabha K. Kulkarni
Keyword(s):  
Zns Nanoparticles ◽  
Zinc Blende ◽  
Doped Zno ◽  
Mn Doped

Enhanced Electronic and Magnetic Properties of Cr- and Mn-Doped GeC Zinc Blende

2020 ◽  
Vol 33 (8) ◽  
pp. 2513-2520 ◽  
Author(s):  
N. Mediane ◽  
F. Goumrhar ◽  
L. B. Drissi ◽  
K. Htoutou ◽  
R. Ahl Laamara
Keyword(s):  
Magnetic Properties ◽  
Electronic And Magnetic Properties ◽  
Zinc Blende ◽  
Mn Doped

Synthesis of High Quality Zinc Blende CdSe Nanocrystals

2005 ◽  
Vol 109 (21) ◽  
pp. 10533-10537 ◽  
Author(s):  
Mona B. Mohamed ◽  
Dino Tonti ◽  
Awos Al-Salman ◽  
Abdelkrim Chemseddine ◽  
Majed Chergui
Keyword(s):  
Cdse Nanocrystals ◽  
High Quality ◽  
Zinc Blende
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