Colorimetric detection of manganese(II) ions using gold/dopa nanoparticles
- Colorimetric detection of manganese(II) ions using gold/dopa nanoparticles
- 박현호; 베드리칸난
- CAPPED GOLD NANOPARTICLES; CYLINDROCLADIUM-FLORIDANUM; MERCURY(II)
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, v.131, pp.132 - 137
- We report here a one-pot, greener, eco-friendly strategy for the synthesis of gold nanoparticles using L-dopa. The as-prepared dopa-functionalized gold nanoparticles (AuNPsiclopa) can detect low concentrations of manganese(II) metal ions in aqueous solution. The binding forces between dopa and Mn2+ ions cause dopa-functionalized gold nanoparticles to come closer together, decreasing the interparticle distance and aggregating it with a change in color of colloidal solution from red to purplish-blue. Dynamic light scattering (DLS) analysis showed a decreased surface charge on the surface of gold nanoparticles when exposed to Mn2+ ions, which caused cross-linking aggregation. Transmission electron microscopic (TEM) images also revealed the aggregation of gold nanoparticles with the addition of Mn2+ ions. The extinction ratio of absorbance at 700-550 nm (A(700)/A(550)) was linear against the concentration of [Mn2+] ions. Thus, the optical absorption spectra of gold colloidal solution before and after the addition of Mn2+ ions reveal the concentration of Mn2+ ions in solution. (C) 2014 Elsevier B.V. All rights reserved.
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