Improved Synthesis Method of SiO2@Ag Core-Shell for Detection of Toxic Metals in Water

Nakadech Youngwilai; Suttinun Phongtamrug

doi:10.4028/www.scientific.net/KEM.757.115

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 757Improved Synthesis Method of SiO2@Ag Core-Shell...

Improved Synthesis Method of SiO₂@Ag Core-Shell for Detection of Toxic Metals in Water

Abstract:

Silvernanoshell consisting of Ag coated on SiO₂ core was synthesized and employed as a colorimetric probe for detection of toxic metals ions in water. The SiO₂@Ag Core-Shell preparation method was fine-tuned and adjusted to prepare a mono-dispersed and fully encapsulated Ag nanoshell. Silica core spheres with the average diameter of 100 nm was prepared by Stöber method and subsequently coated with AgNPs by Seed-Mediated Growth Technique using NaBH₄ as a reducing agent and PVA as a stabilizer. The resulting Ag nanoparticles tethered on silica spheres were found to serve as nucleation sites for the further growth of a silver nanoshell overlayers. The SiO₂@Ag was characterized by UV-Visible Spectroscopy and Transmission Electron Microscopy. It was found that the AgNPs was successfully coated on the surface of silica spheres with the average thickness around 20 nm. The adsorptivity of metal ions onto the surface of Ag nanoshell were tested and calibrated using series of Hg²⁺ and Pb²⁺ ions with various concentrations. The changes in the band intensity of the surface plasmonresonance (SPR) band, which correspond to the changes in the concentration of ions in model waste water, were evident.

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Key Engineering Materials (Volume 757)

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115-119

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.757.115

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Online since:

October 2017

Authors:

Nakadech Youngwilai*, Suttinun Phongtamrug

Keywords:

Ag Nanoshell, Colorimetric Method

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