Journal of Nanoparticle Research

, 11:1053

Surface-functionalization of spherical silver nanoparticles with macrocyclic polyammonium cations and their potential for sensing phosphates

Research Paper

DOI: 10.1007/s11051-008-9493-x

Cite this article as:
Misra, T.K. & Liu, C. J Nanopart Res (2009) 11: 1053. doi:10.1007/s11051-008-9493-x

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), HPO42− (dibasic phosphate, DBP) and PO43− (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.

Keywords

Silver nanoparticlesFunctionalizationMacrocyclic polyammonium chloridesWaterDispersionPhosphatesColloids

Supplementary material

11051_2008_9493_MOESM1_ESM.pdf (56 kb)
MOESM1 [Supporting material includes the photographs of 32-MCPAC-Ag-NPs in the presence of phosphate ions over time.] (PDF 55 kb)] (PDF 55 kb)

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Department of ChemistryNational Taiwan UniversityTaipeiTaiwan