Synthesis and Characterization of CdSe/CdS Core-Shell and CdSe/CdS Composites

1999 ◽  
Vol 581 ◽  
Author(s):  
M. Azad Malika ◽  
Paul O'Brien ◽  
N. Revaprasaduac
Keyword(s):  
Absorption Band ◽  
Shell Structure ◽  
Band Edge ◽  
Spherical Particles ◽  
Core Shell ◽  
Band Edge Emission ◽  
Absorption Band Edge ◽  
Emission Maximum ◽  
Core Shell Structure ◽  
Average Size

ABSTRACTHighly mono-dispersed CdSe/CdS core-shell and CdSe/CdS composites have been prepared by a novel route involving thermolysis in TOPO using Cd(Se2CNMe(nHex))2 and Cd(S2CNMe(nHex))2. The absorption band edge (652 nm, 1.90 eV) of the CdSe-CdS core-shell structure is red shifted (22 nm, 0.0 17 eV) as compared to the CdSe nanoparticles (630 nm, 1.96 eV) whereas the absorption spectrum of the CdSe-CdS composites shows the absorption band edge at (584 nm, 2.12 eV), blue shifted (46 nm, 0.037 eV) as expected. Photoluminescence (PL, λex = 400 nm) of both the core-shell (622 nm) and the composites (588 nm) show values close to band edge emission. A sharper emission maximum with a considerable increase of intensity is observed for core-shell structure as compared to that of CdSe whereas the composite showed a broader emission maximum. The TEM images of the CdSe/CdS core-shell nanoparticles show crystalline, spherical particles with the average size of 53 Å (±7 %), a increase of 8 Å than the average size of CdSe (45 Å) nanoparticles, with a narrow size distribution. The High Resolution Transmission Electron Microscopy (HRTEM) showed lattice spacing intermediate between those for CdSe and CdS as is observed by Selected Area Electron Diffraction (SAED) and X-ray patterns (hexagonal phase). As expected no interface can be observed by HRTEM between CdSe core and CdS shell. The TEM image of the CdSe-CdS composites show particles with an average size of 48.7 Å (±10%).

scholarly journals Photocatalytic properties of a new Z-scheme system BaTiO3/In2S3 with a core–shell structure

RSC Advances ◽  
2019 ◽  
Vol 9 (20) ◽  
pp. 11377-11384 ◽  
Author(s):  
Kaili Wei ◽  
Baolai Wang ◽  
Jiamin Hu ◽  
Fuming Chen ◽  
Qing Hao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Valence Band ◽  
Conduction Band ◽  
Shell Structure ◽  
Band Edge ◽  
Conduction Band Edge ◽  
Core Shell ◽  
Valence Band Edge ◽  
Core Shell Structure ◽  
Positive Valence

It's highly desired to design an effective Z-scheme photocatalyst with excellent charge transfer and separation, a more negative conduction band edge (ECB) than O2/·O2− (−0.33 eV) and a more positive valence band edge (EVB) than ·OH/OH− (+2.27 eV).

Effect of protamine on Fe3O4@CS@GFTN composite magnetic nanoparticles

2019 ◽  
Vol 13 (02) ◽  
pp. 2050001 ◽  
Author(s):  
Huiping Shao ◽  
Luhui Wang ◽  
Tao Lin ◽  
Yumeng Zhang ◽  
Zhinan Zhang
Keyword(s):  
Magnetic Nanoparticles ◽  
Shell Structure ◽  
Lung Diseases ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Core Shell Structure ◽  
Average Size ◽  
Chemical Coprecipitation Method

Fe3O4@chitosan (CS)@Gefitinib (GFTN) core-shell structure composite magnetic nanoparticles (NPs) were prepared by chemical coprecipitation method in this study. In addition, protamine was doped in Fe3O4 cores to prepare Fe3O4@protamine@CS@GFTN core-shell structure composite NPs, in order to increase the loading of GFTN in composite NPs. They were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and spectrophotometer. The results show that the average size of Fe3O4@CS@GFTN and Fe3O4@protamine@CS@GFTN composite NPs is approximately 19 and 21[Formula: see text]nm, respectively. The saturation magnetizations of composite magnetic NPs and corresponding magnetic fluids are 57.20, 20.79, 59.58 and 19.75[Formula: see text]emu/g, respectively. The loading of GFTN in composite NPs was measured by a spectrophotometer to be about 13.5% and 27.6%, respectively. The addition of protamine increased the loading of GFTN two times, indicating that it will play an important role in the management of lung diseases.

Preparation of Core/Shell Composite Latex Particles and Toughening Modification for Polyamide 6

2009 ◽  
Vol 79-82 ◽  
pp. 2103-2106
Author(s):  
Xi Jun Liu ◽  
Hai Ping Li ◽  
Feng Li ◽  
Rui Xia Tian ◽  
Qing Li
Keyword(s):  
Shell Structure ◽  
Polyamide 6 ◽  
Core Shell ◽  
Melt Blending ◽  
Seeded Emulsion Polymerization ◽  
Latex Particles ◽  
The Core ◽  
Core Shell Structure ◽  
Average Size ◽  
Shell Composite

In this paper, a novel poly(butyl methacry1ate)/poly(methyl methacrylate-itaconic acid)(PBA/P(MMA-ITA)) latex particles with core/shell structure (CSR) was synthesized by the method of pre-emulsion semi-continuous seeded emulsion polymerization. The core/shell structure of CSR was characterized by TEM and confirmed that the average size of CSR particles was about 330 nm and that of PBA core was about 290 nm. The polyamide 6 (PA 6)/CSR blends (N/CSR) were prepared by the melt-blending technique, and its impact strength reached 40kJ•m-2 (more than 7 times higher than neat PA 6) when the ITA dosage was in the range of 4%~10%. The results of SEM showed that the high toughness of N/CSR blends was the result of the shear deformation of PA 6 matrix induced by cavitation of dispersed phase CSR.

Microfluidic fabrication of cholesteric liquid crystal core–shell structures toward magnetically transportable microlasers

Lab on a Chip ◽  
2016 ◽  
Vol 16 (7) ◽  
pp. 1206-1213 ◽  
Author(s):  
Lu-Jian Chen ◽  
Ling-Li Gong ◽  
Ya-Li Lin ◽  
Xin-Yi Jin ◽  
Han-Ying Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Active Control ◽  
Shell Structure ◽  
Cholesteric Liquid Crystal ◽  
Band Edge ◽  
Shell Structures ◽  
Core Shell ◽  
Edge Mode ◽  
Crystal Core ◽  
Core Shell Structure

We report a magnetically transportable microlaser with cholesteric liquid crystal (CLC) core–shell structure, operating in band-edge mode, which might offer promise in in-channel illumination applications requiring active control.

Electrical Conductivity of Ni-YSZ Anode for SOFCs According to the Ni Powder Size Variations in Core-shell Structure

2015 ◽  
Vol 53 (4) ◽  
pp. 287-293
Author(s):  
Byung-Hyun Choi ◽  
Young Jin Kang ◽  
Sung-Hun Jung ◽  
Yong-Tae An ◽  
Mi-Jung Ji
Keyword(s):  
Electrical Conductivity ◽  
Shell Structure ◽  
Core Shell ◽  
Powder Size ◽  
Ni Powder ◽  
Core Shell Structure

Preparation of Porous Core/Shell Structure Fe$lt;inf$gt;2$lt;/inf$gt;O$lt;inf$gt;3$lt;/inf$gt;/Al Nanothermite Membrane by Template Method

2015 ◽  
Vol 30 (6) ◽  
pp. 610 ◽  
Author(s):  
ZHENG Guo-Qiang ◽  
ZHANG Wen-Chao ◽  
XU Xing ◽  
SHEN Rui-Qi ◽  
DENG Ji-Ping ◽  
...  
Keyword(s):  
Shell Structure ◽  
Template Method ◽  
Core Shell ◽  
Porous Core ◽  
Core Shell Structure

Functional properties of BaTiO3–Ni0.5Zn0.5Fe2O4 magnetoelectric ceramics prepared from powders with core-shell structure

2010 ◽  
Vol 107 (10) ◽  
pp. 104106 ◽  
Author(s):  
L. P. Curecheriu ◽  
M. T. Buscaglia ◽  
V. Buscaglia ◽  
L. Mitoseriu ◽  
P. Postolache ◽  
...  
Keyword(s):  
Functional Properties ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure
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