研究目的
To develop a simple and single-step approach for the preparation of bimetallic Ag–Au colloids using Na2EDTA, which simultaneously acts as a reductant and an effective agent for regulating the composition of obtained nanoparticles.
研究成果
A simple and single-step approach to the preparation of bimetallic Ag–Au colloids using Na2EDTA was demonstrated. Na2EDTA was found to act not only as a reductant of metal ions but also as an effective agent for controlling the composition of the formed nanoparticles. By controlling Na2EDTA concentration in the reaction mixture, it is possible to control composition (Ag/Au ratio), size and size distribution of synthesized colloidal bimetallic Ag–Au nanoparticles.
研究不足
The synthetic protocols for high-quality bimetallic nanoparticles with controllable size, morphology, composition and structure have not been sufficiently well-developed thus far. The stability of the prepared colloidal solutions depends on the Na2EDTA concentration.
1：Experimental Design and Method Selection:
The synthesis was carried out by mixing Na2EDTA with AgNO3 and HAuCl4 in aqueous alkaline medium at 80 °C. Na2EDTA acts as a reductant and stabilizer.
2：Sample Selection and Data Sources:
Colloidal solutions of individual silver and gold nanoparticles were prepared under identical conditions for comparison.
3：List of Experimental Equipment and Materials:
A 100 ml reaction flask, distilled water, NaOH solution, Na2EDTA solution, AgNO3 solution, HAuCl4 solution.
4：Experimental Procedures and Operational Workflow:
The sequence of reagent addition was crucial to avoid adverse side reactions. The reaction mixture was heated to 80 °C, and the color change indicated the formation of nanoparticles.
5：Data Analysis Methods:
Optical absorption spectra were acquired using a Cary 500 double-beam spectrophotometer. The composition of nanoparticles was determined by inductively coupled plasma optical emission spectrometry using a Prodigy Plus analyser.
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