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Ionic bis-nanoparticle networks.

Neouze MA, Litschauer M, Puchberger M, Bernardi J - Monatsh. Chem. (2012)

Bottom Line: Although some nanoparticle networks have been reported, few works are addressing the highly exciting problem of forming bis-nanoparticle assemblies in which two different types of nanoparticles are present.In this article we report an original synthesis pathway for the formation of an ionic bis-nanoparticle network, silica/silver, based on the formation of an imidazolium bridging unit.This composite formation is therefore very general and could be extended to other metal/metal oxide composites. .

View Article: PubMed Central - PubMed

Affiliation: Institute of Materials Chemistry, Vienna University of Technology, Vienna, Austria.

ABSTRACT

Abstract: A newly arising challenge in the field of nanoparticle research concerns the control and the understanding of the interparticle interactions and interparticle properties. This should allow the development of materials based on nanoparticle assemblies which represents a great opportunity to exploit nanoparticle collective properties. Although some nanoparticle networks have been reported, few works are addressing the highly exciting problem of forming bis-nanoparticle assemblies in which two different types of nanoparticles are present. In this article we report an original synthesis pathway for the formation of an ionic bis-nanoparticle network, silica/silver, based on the formation of an imidazolium bridging unit. The reaction used for the formation of the bridging imidazolium can be considered as click-like chemistry. The synthesis of the metal/metal oxide hybrid composite material starts from the formation of a metal oxide nanoparticle modified with an imidazole ligand. This composite formation is therefore very general and could be extended to other metal/metal oxide composites.

Graphical abstract: .

No MeSH data available.


Top XRD diffractogram and bottom UV–Vis absorption spectrum of the silica/silver bis-nanoparticle network
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Fig5: Top XRD diffractogram and bottom UV–Vis absorption spectrum of the silica/silver bis-nanoparticle network

Mentions: The X-ray diffractogram obtained for the final hybrid material SiO2_Ag (Fig. 5, top) confirmed the reduction of the silver cations. The reflections of the final composite at 2θ = 38°, 44°, 64.5°, 77.5° and 82° were characteristic of metallic silver. Scherrer’s equation, applied on the silver (111) reflection at 38°, affords an average diameter of silver crystallites in the 14 nm range. In addition, UV–Vis absorption spectroscopy was performed. Indeed, the UV–Vis absorption band of silver nanoparticles can be directly related to the size of the nanoparticles [24]. The absorption centred on 410 nm for the silica/silver bis-nanoparticle network indicated the presence of silver nanoparticles with a size between 10 and 15 nm (Fig. 5, bottom). This characterization confirms that the crystallite size estimated by X-ray powder diffraction (XRD) corresponds also to the size of the nanoparticles contained in the material.Fig. 5


Ionic bis-nanoparticle networks.

Neouze MA, Litschauer M, Puchberger M, Bernardi J - Monatsh. Chem. (2012)

Top XRD diffractogram and bottom UV–Vis absorption spectrum of the silica/silver bis-nanoparticle network
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4495052&req=5

Fig5: Top XRD diffractogram and bottom UV–Vis absorption spectrum of the silica/silver bis-nanoparticle network
Mentions: The X-ray diffractogram obtained for the final hybrid material SiO2_Ag (Fig. 5, top) confirmed the reduction of the silver cations. The reflections of the final composite at 2θ = 38°, 44°, 64.5°, 77.5° and 82° were characteristic of metallic silver. Scherrer’s equation, applied on the silver (111) reflection at 38°, affords an average diameter of silver crystallites in the 14 nm range. In addition, UV–Vis absorption spectroscopy was performed. Indeed, the UV–Vis absorption band of silver nanoparticles can be directly related to the size of the nanoparticles [24]. The absorption centred on 410 nm for the silica/silver bis-nanoparticle network indicated the presence of silver nanoparticles with a size between 10 and 15 nm (Fig. 5, bottom). This characterization confirms that the crystallite size estimated by X-ray powder diffraction (XRD) corresponds also to the size of the nanoparticles contained in the material.Fig. 5

Bottom Line: Although some nanoparticle networks have been reported, few works are addressing the highly exciting problem of forming bis-nanoparticle assemblies in which two different types of nanoparticles are present.In this article we report an original synthesis pathway for the formation of an ionic bis-nanoparticle network, silica/silver, based on the formation of an imidazolium bridging unit.This composite formation is therefore very general and could be extended to other metal/metal oxide composites. .

View Article: PubMed Central - PubMed

Affiliation: Institute of Materials Chemistry, Vienna University of Technology, Vienna, Austria.

ABSTRACT

Abstract: A newly arising challenge in the field of nanoparticle research concerns the control and the understanding of the interparticle interactions and interparticle properties. This should allow the development of materials based on nanoparticle assemblies which represents a great opportunity to exploit nanoparticle collective properties. Although some nanoparticle networks have been reported, few works are addressing the highly exciting problem of forming bis-nanoparticle assemblies in which two different types of nanoparticles are present. In this article we report an original synthesis pathway for the formation of an ionic bis-nanoparticle network, silica/silver, based on the formation of an imidazolium bridging unit. The reaction used for the formation of the bridging imidazolium can be considered as click-like chemistry. The synthesis of the metal/metal oxide hybrid composite material starts from the formation of a metal oxide nanoparticle modified with an imidazole ligand. This composite formation is therefore very general and could be extended to other metal/metal oxide composites.

Graphical abstract: .

No MeSH data available.