Synthesis of CTAB–IPA reduced copper nanoparticles

Abstract Synthesis of copper nanoparticles by reduction of Cu 2+ ions to Cu 0 in the presence of cetyltrimethylammonium bromide (CTAB) and isopropanol (IPA). Experiments included the synthesis of copper nanoparticles by varying the molar concentration of CTAB keeping that of Cu 2+ ions constant. In the first set Cu 2+ -IPA solution was added to CTAB–IPA mixture, the sequence was reversed in the second set. Differences in results are observed in each case. UV–visible spectra were recorded to note the changes taking place as a function of the added volume. Plasmon band for Cu 0 at ∼560 nm and oligomers of Cu 0 at ∼290 and ∼340 nm wavelengths are observed. CTAB appears to play the role of catalyst in the reduction of Cu 2+ ions in IPA under ambient conditions. Transmission electron microscopic (TEM) analysis of the copper nanoparticles synthesized at the two extreme molar ratios of Cu 2+ :CTAB, i.e. 1:0.25 and 1:30 show particles of size ∼5–20 and ∼2–10 nm, respectively, with a spherical morphology.

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