Method for cleaning metal nanoparticles
A technology of metal nanoparticles and metals, applied in the direction of cleaning methods using liquids, cleaning methods and utensils, chemical instruments and methods, etc., to achieve the effect of increasing the filling factor and reducing the thickness
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[0027] When metal nanoparticles are prepared by a conventional preparation method using an organic solvent, several kinds of impurities may remain on the surface of the metal nanoparticles. Surfactants, whether polar or non-polar, can be removed by washing with ethanol and toluene. However, organic substances and chloride ions used as reactants may remain on the surface of the particles even with such cleaning, so that the purity of the metal nanoparticles is reduced.
[0028] Therefore, treatment with an organic acid or alcohol solution is required after the treatment with ethanol and toluene in order to remove such organic substances. The alcohol may be a C1-C16 alcohol, especially a C1-C10 alcohol. When an alcohol having more than 16 carbon atoms is used, it may be solid in the oil phase and has low solubility in water.
[0029] figure 2 Shown is the cleaning efficiency of the organic substance when the organic substance is cleaned with ethanol or methanol or an aqueous...
Embodiment 1
[0042] Example 1: Removal of Organic Substances from Metal Nanoparticles
[0043] Metal nanoparticles prepared in an organic solvent phase including amine and surfactant are recovered by using a centrifuge. The recovered metal nanoparticles were washed with methanol (MeOH) while sonicating for 10 minutes. Use ethanol (EtOH), methanol+ethanol (MeOH+EtOH), methanol+pure water (MeOH+H 2 O (v / v 9:1)), and ethanol + pure water (EtOH + H 2 O (v / v 9:1)) carried out the same cleaning process. figure 2 The surface of the nanoparticles after each cleaning process obtained by FT-IR (Fourier Transform Infrared Spectroscopy, Perkin-Elmer) is shown. It should be noted that when no water was used, a peak appeared indicating the presence of organic species remaining on the surface of the nanoparticles, whereas when an aqueous cleaning solution was used there was no peak of organic species and the curve was smooth.
Embodiment 2
[0044] Example 2: Removal of chloride ions from the surface of nanoparticles
[0045] After washing the nanoparticles twice with ethanol and twice with toluene, the nanoparticles were washed with acetic acid while performing sonication for 10 minutes. Use methanol + pure water (MeOH+H 2 O (9:1, v / v)) and ammonium bicarbonate solution (10 wt.%) were subjected to the same cleaning process. Each nanoparticle was then dried and analyzed for the presence of residual chloride ions on the surface of the nanoparticles by using ion chromatography (IC), as shown in Table 1. It should be noted that chloride ion removal was best when ammonium bicarbonate was used to wash the nanoparticles.
[0046] Table 1
[0047]
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