Enhancement Effect of Illumination on the Photoluminescence of Water-Soluble CdTe Nanocrystals: Toward Highly Fluorescent CdTe/CdS Core—Shell Structure.

ChemInform ◽  
2004 ◽  
Vol 35 (50) ◽  
Author(s):  
Haobo Bao ◽  
Yanjun Gong ◽  
Zhen Li ◽  
Mingyuan Gao
Keyword(s):  
Shell Structure ◽  
Water Soluble ◽  
Core Shell ◽  
Enhancement Effect ◽  
Cdte Nanocrystals ◽  
Core Shell Structure

Medicated structural PVP/PEG composites fabricated using coaxial electrospinning

e-Polymers ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Yong-Hui Wu ◽  
Deng-Guang Yu ◽  
Hai-Peng Li ◽  
Xiang-Yang Wu ◽  
Xiao-Yan Li
Keyword(s):  
Electron Microscope ◽  
Citric Acid ◽  
Shell Structure ◽  
Water Soluble ◽  
Working Fluid ◽  
Coaxial Electrospinning ◽  
Core Shell ◽  
The Core ◽  
Poorly Water Soluble ◽  
Core Shell Structure

AbstractA new type of medicated polymeric composite consisting of acyclovir (ACY), polyvinylpyrrolidone K60 (PVP) and polyethylene glycol 6000 (PEG) with core-shell structure were prepared by a coaxial electrospinning process. The composites could enhance the dissolution of the poorly water-soluble drug. The shell layers were formed from a spinnable working fluid containing the filament-forming PVP and citric acid while the core parts were prepared from an un-spinnable co-dissolving solution composed of ACY, sodium hydrate and PEG. Scanning electron microscope and transmission electron microscope observations demonstrated that the composites had a homogeneous linear topography with a slippery surface, a diameter of 670±130 nm, and an obvious core-shell structure. X-ray diffraction (XRD) and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy results demonstrated that the drug and citric acid contained in the core and shell parts were in an amorphous status. In vitro dissolution experiments exhibited that ACY was able to be free within 1 min, and the dissolution media were neutral due to acid-basic action within the core-shell structures. The medicated nanocomposites resulted from a combined usage of hydrophilic polymeric excipients PVP and PEG could provide a new solution to the problem associated with the dissolution of poorly water-soluble drugs.

Synthesis and properties of water-soluble CdSe/ZnS nanocrystals with the type-I core/shell structure

2008 ◽  
Vol 23 (5) ◽  
pp. 600-605 ◽  
Author(s):  
Deping Wang ◽  
Meijuan Yu ◽  
Wenhai Huang ◽  
Wangxing Xie ◽  
Lu Wang
Keyword(s):  
Shell Structure ◽  
Water Soluble ◽  
Core Shell ◽  
Type I ◽  
Zns Nanocrystals ◽  
Core Shell Structure

Sensitive determination of catechol using a glassy carbon electrode modified with l-cysteine and ZnS:Ni/ZnS quantum dots

2015 ◽  
Vol 7 (1) ◽  
pp. 260-265 ◽  
Author(s):  
Jianying Qu ◽  
Yong Wang ◽  
Ying Dong ◽  
Zhuanying Zhu ◽  
Huanhuan Xing
Keyword(s):  
Quantum Dots ◽  
Electrochemical Sensor ◽  
Glassy Carbon ◽  
Shell Structure ◽  
Water Soluble ◽  
Core Shell ◽  
Carbon Electrode ◽  
Sensitive Determination ◽  
Core Shell Structure

In this work, water-soluble ZnS:Ni/ZnS quantum dots with core/shell structure were obtained successfully. Based on this, a novel electrochemical sensor for sensitive determination of CC was fabricated.

Water-soluble, high-quality ZnSe@ZnS core/shell structure nanocrystals

2013 ◽  
Vol 1 (1) ◽  
pp. 56-64 ◽  
Author(s):  
Yongling Ding ◽  
Huadong Sun ◽  
Dong Liu ◽  
Futian Liu ◽  
Dongzhi Wang ◽  
...  
Keyword(s):  
Shell Structure ◽  
Water Soluble ◽  
Core Shell ◽  
High Quality ◽  
Core Shell Structure

Synthesis of CdS/CdCO3 Core/Shell Structural Nanocrystals Potentially Used for Solar Cell via Hydrothermal Route

2011 ◽  
Vol 79 ◽  
pp. 7-12 ◽  
Author(s):  
Rong Hui Xu ◽  
Jiu Ba Wen ◽  
Feng Zhang Ren
Keyword(s):  
Solar Cell ◽  
Shell Structure ◽  
Ostwald Ripening ◽  
Semiconductor Nanocrystals ◽  
Water Soluble ◽  
Core Shell ◽  
Growth Stages ◽  
Hydrothermal Route ◽  
X Ray ◽  
Core Shell Structure

Synthesis of CdS/CdCO3Core/Shell semiconductor nanocrystals potentially used for solar cell via hydrothermal route is presented. Water-soluble crystallites with wurtzite crystal structure (CdS), hexagonal structure (CdCO3) with strong photoluminescence are prepared. The synthesis is based on the separation of the nucleation and growth stages of core and shell by controlling some crucial factors such as temperature, pH, ratio and concentration of reactant mixture. Bare wurtzite structural CdS nanocrystallites were synthesized by using cadmium acetate and thiourea as precursors. Ostwald ripening process under high temperature leads to high sample quality. Photoluminescence of nanocrystals with Core/Shell Structure and bare nanocrystals was compared and analysed. Nanocrystals with Core/Shell Structure have stabler performance of photoluminescence than CdS bare nanocrystallites because of the shell. Transmission electron microscopy and X-ray powder diffraction indicate the presence of bulk structural properties in crystallites as small as 5nm in diameter. X-ray Photoelectron Spectroscopy was used to characterize core/shell structure of as-prepared NCs. Ultra-stability and super strong photoluminescence emission of as-prepared CdS/CdCO3Core/Shell semiconductor nanocrystallites indicates its potentially practical value in NCs solar cell.

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