EDTA-capped gold nanoparticles as a colorimetric probe for aluminium
| Autor: | Devendra P.S. Negi, Siewdorlang Diamai |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Detection limit Polymers and Plastics Absorption spectroscopy Chemistry Inorganic chemistry Metals and Alloys Ethylenediaminetetraacetic acid 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Biomaterials chemistry.chemical_compound Dynamic light scattering Absorption band Colloidal gold Transmission electron microscopy 0210 nano-technology |
| Zdroj: | Materials Research Express. 3:115002 |
| ISSN: | 2053-1591 |
| DOI: | 10.1088/2053-1591/3/11/115002 |
| Popis: | Gold nanoparticles (AuNPs) have been synthesized using ethylenediaminetetraacetic acid (EDTA) as a capping agent. Transmission electron microscopy measurements showed the particles to have an average size of ~40 nm. The absorption spectrum of the AuNPs displayed a sharp absorption band at 523 nm. The red colloidal solution of the AuNPs was found to immediately change its colour to blue upon addition of 20 μm Al3+ ions. The addition of the same concentration of Cr3+ ions resulted in the same colour change but only after ~5 min. No colour change was observed on addition of the same concentrations of Fe3+, Cu2+, Pb2+, Cd2+, Zn2+, Co2+, Ni2+, Hg2+ and Mn2+ ions . The colour change was attributed to the aggregation of the AuNPs due to complexation of the Al3+ ions by EDTA on the AuNPs. This was supported by dynamic light scattering data. A plot of the ratio of the extinctions at 700 and 523 nm versus the Al3+ ion concentration was linear in the 2–18 μm range and the limit of detection was 3.6 μm. |
| Databáze: | OpenAIRE |
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