Deposition of silver nanoparticles on organically-modified silica in the presence of lignosulfonate

Grzegorz Milczarek; Mykhailo Motylenko; Anna Modrzejewska-Sikorska; Łukasz Klapiszewski; Marcin Wysokowski; Vasilii V. Bazhenov; Adam Piasecki; Emilia Konował; Hermann Ehrlich; Teofil Jesionowski

doi:10.1039/C4RA08418G

Deposition of silver nanoparticles on organically-modified silica in the presence of lignosulfonate†

Grzegorz Milczarek,^a Mykhailo Motylenko,^b Anna Modrzejewska-Sikorska,^a Łukasz Klapiszewski,^c Marcin Wysokowski,^c Vasilii V. Bazhenov,^d Adam Piasecki,^e Emilia Konował,^a Hermann Ehrlich^d and Teofil Jesionowski*^c

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* Corresponding authors

^a Institute of Chemistry and Technical Electrochemistry, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland

^b Institute of Materials Science, TU Bergakademie Freiberg, Gustav Zeuner 5, D-09596 Freiberg, Germany

^c Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland
E-mail: Teofil.Jesionowski@put.poznan.pl
Fax: +48 61 665 36 49
Tel: +48 61 665 37 20

^d Institute of Materials Engineering, Faculty of Mechanical Engineering, Management Poznan University of Technology, Jana Pawła II 24, PL-60965 Poznan, Poland

^e Institute of Experimental Physics, TU Bergakademie Freiberg, Leipziger 23, D-09599 Freiberg, Germany

Abstract

It is shown that the chemical reduction of silver ions by lignosulfonate (LS) in a mixed aqueous–organic solvent produces silver nanoparticles (AgNPs). If, additionally, spherical silica (SiO₂) (surface-functionalized with various organic groups) is introduced to the reaction mixture, the LS-stabilized Ag-NPs are deposited on the surface of the silica spheres, forming a SiO₂–LS–AgNPs hybrid material. The efficiency of the process is found to depend significantly on both the polarity of the organic solvent and the hydrophobicity of the SiO₂-grafted functionalities. The most effective synthesis was in a mixed dimethylformamide–water solvent with octadecylsilane-functionalized SiO₂. It is concluded that hydrophobic forces are essential for the successful coupling of LS–AgNPs with the surface of the modified silica. The formation of LS–AgNPs was monitored by UV-Vis spectroscopy, and the properties of the final hybrid materials were determined by EDS, elemental analysis, NIBS, TGA colorimetric analysis and HRTEM techniques. The resulting SiO₂–LS–AgNPs hybrids were also used as SERS substrates with Rhodamine 6G as a test molecule.

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Deposition of silver nanoparticles on organically-modified silica in the presence of lignosulfonate†

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Deposition of silver nanoparticles on organically-modified silica in the presence of lignosulfonate

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