Surface-functionalization of spherical silver nanoparticles with macrocyclic polyammonium cations and their potential for sensing phosphates |
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Authors: | Tarun Kumar Misra Chuen-Ying Liu |
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Institution: | (1) Department of Chemistry, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan |
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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.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Silver nanoparticles Functionalization Macrocyclic polyammonium chlorides Water Dispersion Phosphates Colloids |
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