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

  • Tarun Kumar Misra
  • Chuen-Ying Liu
Research Paper


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.


Silver nanoparticles Functionalization Macrocyclic polyammonium chlorides Water Dispersion Phosphates Colloids 



The authors would like to thank the National Science Council of Taiwan for their generous financial support of this research.

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)


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Department of ChemistryNational Taiwan UniversityTaipeiTaiwan

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