Sol-Gel Elaboration and Optical Features of Eu3+-Doped CdS Nanocrystals in SiO2

2007 ◽  
Vol 555 ◽  
pp. 389-393 ◽  
Author(s):  
B. Julián ◽  
J. Planelles ◽  
E. Cordoncillo ◽  
P. Escribano ◽  
C. Sanchez ◽  
...  
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Cds Nanoparticles ◽  
Rare Earth Ion ◽  
Sio2 Matrix ◽  
Chemical Homogeneity ◽  
Synthesis Conditions ◽  
Cds Nanocrystals ◽  
Back Transfer

In this work, Eu3+-doped CdS nanocrystals embedded in a SiO2 matrix were synthesised by a sol-gel method since this method confers a great chemical homogeneity, and allows in-situ generation and controlled growth of CdS nanocrystals within the silica glass. The influence of the sol-gel conditions on the Eu3+ optical response has been investigated. The synthesis conditions can be varied to modify the structure of the material, and the dispersion of the rare earth ion, within the silica matrix. From the optical analysis an energy transfer appears from CdS nanoparticles to Eu3+ ions but also a back transfer Eu3+ to CdS nanoparticles is evidenced.

Bioencapsulation in Sol-Gel Glasses

1998 ◽  
Vol 519 ◽  
Author(s):  
L. Bergogne ◽  
S. Fennouh ◽  
J. Livage ◽  
C. Roux
Keyword(s):  
Sol Gel ◽  
Porous Silica ◽  
Silica Matrix ◽  
Whole Cells ◽  
The Past ◽  
Wide Range ◽  
Activity Of Enzymes ◽  
Gel Glasses ◽  
Micro Organisms

AbstractBioencapsulation in sol-gel materials has been widely studied during the past decade. Trapped species appear to retain their bioactivity in the porous silica matrix. Small analytes can diffuse through the pores allowing bioreactions to be performed in-situ, inside the sol-gel glass. A wide range of biomolecules and micro-organisms have been encapsulated. The catalytic activity of enzymes is used for the realization of biosensors or bioreactors. Antibody-antigen recognition has been shown to be feasible within sol-gel matrices. Trapped antibodies bind specifically the corresponding haptens and can be used for the detection of traces of chemicals. Even whole cells are now encapsulated without any alteration of their cellular organization. They can be used for the production of chemicals or as antigens for immunoassays.

Study of the effect of formamide and N,N-dimethylformamide on the synthesis of CdS nanoparticles in a SiO2 matrix by sol-gel method

1999 ◽  
Vol 1 (6) ◽  
pp. 351-364 ◽  
Author(s):  
F.J. Guaita ◽  
E. Cordoncillo ◽  
H. Beltrán ◽  
P. Escribano ◽  
J.M. Gonzalez Calbet
Keyword(s):  
Sol Gel ◽  
Cds Nanoparticles ◽  
Sio2 Matrix ◽  
Gel Method ◽  
Sol Gel Method

Synthesis of Mn2+ Doped CdS Nanocrystals Embedded in a Sol-Gel Silica Matrix: Characterization of the Luminescence Activator

1996 ◽  
Vol 452 ◽  
Author(s):  
G. Counio ◽  
S. Esnouf ◽  
T. Gacoin ◽  
P. Barboux ◽  
A. Hofstaetter ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Quantum Yield ◽  
Sol Gel ◽  
Silica Matrix ◽  
Silica Xerogels ◽  
Cds Nanocrystals ◽  
Bright Luminescence

AbstractMn2+-doped CdS nanocrystals (1.2 to 2.4 nm in diameter) embedded in organic-inorganic silica xerogels have been synthesized. Extensive studies (EXAFS, ESR and ENDOR) allow us to localize the ions responsible for the bright luminescence observed in such materials (quantum yield of 7%). The average number of Mn2+ per nanocrystal is in the 0.2–0.8 range, and the emission arises from an energy transfer from surface trapped carriers to Mn2+ ions.

scholarly journals Effect of CdS nanocrystals on the photoluminescence of Eu3+-doped silicophosphate sol gel glass

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14552-14561 ◽  
Author(s):  
F. Ben Slimen ◽  
Z. Zaaboub ◽  
M. Haouari ◽  
N. Bel Haj Mohamed ◽  
H. Ben Ouada ◽  
...  
Keyword(s):  
Sol Gel ◽  
Cds Nanoparticles ◽  
Photoluminescence Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Doping ◽  
Cds Nanocrystals

In this work, we investigate the effect of co-doping with CdS nanoparticles on the photoluminescence properties of Eu3+ doped silicophosphate glass prepared via the sol gel method.

scholarly journals In Situ Synthesis of Hybrid Inorganic-Polymer Nanocomposites

2018 ◽  
Author(s):  
Mohammed Adnan ◽  
Antoine Dalod ◽  
Mustafa Balci ◽  
Julia Glaum ◽  
Mari-Ann Einarsrud
Keyword(s):  
Polymer Nanocomposites ◽  
Sol Gel ◽  
Inorganic Nanoparticles ◽  
Inorganic Polymer ◽  
Ex Situ ◽  
Synthesis Methods ◽  
Inorganic Oxide ◽  
Synthesis Conditions ◽  
In Situ Techniques

Hybrid inorganic-polymer nanocomposites can be employed in diverse applications due to the potential combination of desired properties from both the organic and inorganic components. The use of novel bottom-up in situ synthesis methods for the fabrication of these nanocomposites is advantageous compared to top-down ex situ mixing methods, as it offers increased control over the structure and properties of the material. In this review, the focus will be on the application of the sol-gel process for the synthesis of inorganic oxide nanoparticles in epoxy and polysiloxane matrices. The effect of the synthesis conditions and the reactants used on the inorganic structures formed, the interactions between the polymer chains and the inorganic nanoparticles, and the resulting properties of the nanocomposites are appraised from several studies over the last two decades. Lastly, alternative in situ techniques and the applications of various polymer-inorganic oxide nanocomposites are briefly discussed.

Characterization of lanthanum salicylate complex nanoparticles in situ synthesized in silica matrix by a sol–gel process

2004 ◽  
Vol 58 (5) ◽  
pp. 757-761 ◽  
Author(s):  
Xiaofei Yang ◽  
Qizhuang He ◽  
Xianghong He ◽  
Liang Huang
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Sol Gel Process

Evidences of Rare Earth Ion Aggregates in a Sol−Gel Silica Matrix:  The Case of Cerium and Gadolinium

2004 ◽  
Vol 16 (17) ◽  
pp. 3352-3356 ◽  
Author(s):  
Daniela Di Martino ◽  
Anna Vedda ◽  
Giuliano Angella ◽  
Michele Catti ◽  
Elena Cazzini ◽  
...  
Keyword(s):  
Rare Earth ◽  
Sol Gel ◽  
Silica Matrix ◽  
Rare Earth Ion

scholarly journals Time and Temperature Dependence of CdS Nanoparticles Grown in a Polystyrene Matrix

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
F. Antolini ◽  
E. Burresi ◽  
L. Stroea ◽  
V. Morandi ◽  
L. Ortolani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Growth Process ◽  
General Trend ◽  
Cds Nanoparticles ◽  
Size Dependent ◽  
Cds Nanocrystals ◽  
Polystyrene Matrix ◽  
Morphology And Structure ◽  
Cds Qds

Luminescent CdS nanocrystals embedded in a polystyrene matrix were successfully prepared. Thein situgrowth of CdS QDs was realized by thermal treatment of Cd bis(thiolate)/polymer foil at different times and temperatures (240°Cand300°C) of annealing, in order to evaluate their influence on the quantum dots growth process. As a general trend, the increasing of time and temperature of annealing induces a rise of the CdS nanocrystals size into the polymeric matrix. The size distribution, morphology, and structure of the CdS nanoparticles were analysed with HRTEM and XRD experiments. UV-Vis and PL data are strongly size-dependent and were used to investigate the particles' growth process, too. The CdS nanoparticles behavior in solution indicated a general trend of QDs to aggregation. This predisposition was clearly displayed by DLS measurements.

Studies on CdS nanoparticles dispersed in silica matrix prepared by sol-gel technique

2003 ◽  
Vol 31 (1) ◽  
pp. 3-9 ◽  
Author(s):  
B. Bhattacharjee ◽  
S.K. Bera ◽  
D. Ganguli ◽  
S. Chaudhuri ◽  
A.K. Pal
Keyword(s):  
Sol Gel ◽  
Silica Matrix ◽  
Cds Nanoparticles ◽  
Gel Technique

Preparation and Characterization of ZnSe/SiO2 Nanocomposite

2005 ◽  
Vol 23 ◽  
pp. 71-74 ◽  
Author(s):  
Fantao Kong ◽  
Xi Yao ◽  
Min Qiang Wang ◽  
Haiqing Jiang ◽  
Yun Peng Wang
Keyword(s):  
Absorption Spectra ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Silica Matrix ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
As Doping ◽  
Mean Size ◽  
Xrd Patterns

Semiconductor ZnSe nanocrystals (NCs)-doped SiO2 glasses (designated as ZnSe/SiO2 nanocomposites) were prepared successfully by using sol-gel method and in-situ growth technique. The nanocomposite was characterized by X-ray diffraction (XRD) patterns, UV-Vis absorption spectra and X-ray Photoelectron Spectroscopy (XPS). The XRD results show that ZnSe NCs is zinc blende structure and the mean size is smaller than 5nm in diameter. UV-Vis absorption spectra reveals that the size of the NCs is influenced by synthesis conditions such as doping concentration and thermal treatment, and XPS together with XRD can prove that silica matrix plays an important role in enhancing the NCs’ stability.

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