Sol?Gel Derived Organic and Inorganic Hybrid Materials for Photonic Applications: Contribution to the Correlation Between the Material Structure and the Transmission in the Near Infrared Region

Oubaha, Mohamed; Etienne, Pascal; Calas, S.; Coudray, Paul; Nédélec, Jean-Marie; Moreau, Yves

doi:10.1007/s10971-005-5619-0

Cited by 33 publications

(16 citation statements)

References 26 publications

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“…Bands observed at 980 and 1540 nm are assigned to erbium transitions from the fundamental energy level to the excited levels 4 I 11/2 and 4 I 13/2 , respectively. This is in agreement with the typical erbium absorption [21,22]. 980 nm has been found to be the most favourable pumping wavelength as erbium-doped optical amplifiers display a quasi-quantum limited 3 dB noise level, while also displaying an improved performance in terms of gain efficiency [23].…”

Section: 1supporting

confidence: 87%

Structural and Optical Characterisation of an Erbium/Ytterbium Doped Hybrid Material Developed via a Nonhydrolytic Sol-Gel Route

Oubaha

Copperwhite

McDonagh

et al. 2010

SRX Materials Science

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This paper proposes the development and structural characterisation of an Er 3+ /Yb 3+ doped hybrid organic-inorganic material synthesised by a nonhydrolytic sol-gel process. By using a pumping laser diode at 980 nm, a typical Er 3+ luminescence has been recorded in the near infrared region (1.53-1.55 μm). However, the detected fluorescence was particularly weak compared to that generally observed in pure mineral materials, suggesting the occurrence of strong quenching due to multiphonon relaxation processes. To understand this behaviour, structural characterisation of both of the matrix and the local environment of Er 3+ ions were conducted employing infrared spectroscopy, nuclear magnetic resonance, electron paramagnetic resonance, and neutron scattering. These studies showed that the major phenomenon competing with the Er 3+ fluorescence is intimately associated to the strong vibrational modes of the organic species that involve multiphonon relaxation processes, resulting in energy dissipation within the host matrix.

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Section: 1supporting

confidence: 87%

Structural and Optical Characterisation of an Erbium/Ytterbium Doped Hybrid Material Developed via a Nonhydrolytic Sol-Gel Route

Oubaha

Copperwhite

McDonagh

et al. 2010

SRX Materials Science

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“…Recently, the role of OH groups in the attenuation at 1550 nm has been reconsidered, as it was shown that the absorption by CH aliphatic groups induced stronger attenuation at this wavelength than OH groups [11,12]. In addition, it was shown that CH aromatic groups do not induce any absorption at the aforementioned wavelength.…”

mentioning

confidence: 99%

Structural characterisation of a sol-gel copolymer synthesised from aliphatic and aromatic alkoxysilanes using 29Si-NMR spectroscopy

Oubaha

Dubois

Murphy

et al. 2006

J Sol-Gel Sci Technol

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A hybrid organic-inorganic material was prepared from the hydrolytic co-condensation of 3-trimethoxysilylpropylmethacrylate (MAPTMS) and diphenyldiethoxysilane (DPHDES). The synthesis was performed in three steps: (1) MAPTMS pre-hydrolysis, (2) addition of DPHDES, and (3) further hydrolysis of the obtained mixture. 29 Si nuclear magnetic resonance spectroscopy was used to characterise the structural evolution of the mineral network during the synthesis. It revealed the catalytic effect of DPHDES on the condensation reaction of silanol groups, initially observed for pre-hydrolysed MAPTMS. In addition, it was clearly demonstrated that the formation of the highest condensed species of the aromatic oligomers (D 2 species) occurred only in the presence of aliphatic oligomers, which decrease the sterical hindrance about the silicon nuclei.

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“…Chelating agents are used in inorganic chemistry to prevent particle agglomeration by reducing condensation reactions in liquid-phase synthesis [48]. From the point of chemical structure, PVA was used as a hydroxyl chelating agent, while CA was a carboxyl chelating agent.…”

Section: Effect Of the Chelating Agentsmentioning

confidence: 99%

New Approaches to the Study of Spinel Ferrite Nanoparticles for Biomedical Applications

Sanpo

Berndt

Wen

et al. 2015

Handbook of Nanoelectrochemistry

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This chapter is prepared into six different sections. The first part will provide a brief introduction of spinel ferrite nanoparticles synthesis, the use of chelating agents in the sol-gel method, and applications of spinel ferrite nanoparticles in biomedical fields. The second part will cover an overview of the structure and magnetism of spinel ferrites. The third part will present a summary of different types of chelating agents. The fourth part will provide information of the sol-gel synthesis for ceramic nanoparticles. The fifth part will focus on the preparation of cobalt ferrite nanoparticles by sol-gel methods using polyvinyl alcohol (PVA) and citric acid (CA) as chelating agents. The influence of chelating agents on the physical properties and antibacterial property of cobalt ferrite nanoparticles will be highlighted in the last part. A discussion on chelating agent-metal ion formation and the antibacterial mechanisms of spinel ferrite nanoparticles will be presented.

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Sol?Gel Derived Organic and Inorganic Hybrid Materials for Photonic Applications: Contribution to the Correlation Between the Material Structure and the Transmission in the Near Infrared Region

Cited by 33 publications

References 26 publications

Structural and Optical Characterisation of an Erbium/Ytterbium Doped Hybrid Material Developed via a Nonhydrolytic Sol-Gel Route

Structural and Optical Characterisation of an Erbium/Ytterbium Doped Hybrid Material Developed via a Nonhydrolytic Sol-Gel Route

Structural characterisation of a sol-gel copolymer synthesised from aliphatic and aromatic alkoxysilanes using 29Si-NMR spectroscopy

New Approaches to the Study of Spinel Ferrite Nanoparticles for Biomedical Applications

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