Surface-functionalization of Spherical Silver Nanoparticles with Macrocyclic Polyammonium Cations and Their Potential for Sensing Phosphates
Resource
J. Nanopart. Res.,11(5),1053-1063.
Journal
Journal of Nanoparticle Research
Pages
1053-1063
Date Issued
2009-07
Date
2009-07
Author(s)
Misra, T. K.
Liu, C. Y.
Abstract
The synthesis of aqueous dispersion of spherical, underivatized silver nanoparticles (Ag-NPs) stabilized by macrocyclic polyammonium chlorides (MCPAC), [28]ane-(NH2 +)6O2•6Cl - (28-MCPAC) and [32]ane-(NH2 +) 8•8Cl- (32-MCPAC), which are evidently anion receptors, is reported. As-synthesized Ag-NPs are characterized by UV-vis spectroscopy and transmission electron microscopy (TEM). The 28/32-MCPAC-stabilized Ag-NPs show the surface plasmon band around 400 nm. The TEM-images show that the particles are spherical and well-dispersed. By tuning the 28/32-MCPAC:Ag-OAc (silver acetate) ratio, nanoparticles with different core diameters ranging from 13 to 8 nm for 28-MCPAC and from 10 to 6 nm for 32-MCPAC can be obtained. The advantage of using MCPAC as stabilizers is that they make the particles functionalized for sensing anions. Thus, the potential of the as-synthesized Ag-NPs for sensing phosphates: H2PO4 - (monobasic phosphate, MBP), HPO4 2- (dibasic phosphate, DBP) and PO4 3- (tribasic phosphate, TBP) is investigated spectroscopically. Interaction of phosphate ions with macrocyclic polyammonium cations makes the Ag-NPs bare, leading agglomeration. The phosphate-assisted agglomeration of 32-MCPAC-Ag-NPs follow the order TBP > DBP ≫ MBP. © 2008 Springer Science+Business Media B.V.
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Type
journal article
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