A green synthesis of copper nanoparticles using native cyclodextrins as stabilizing agents

Abstract EN

In this work, a comparative study of the effect of the NCD size as a stabilizing agent, on the synthesis of copper nanoparticles (Cu-NPs) by an easy green method was reported.

The nanoparticles were synthesized through the chemical reduction of aqueous solutions of copper (II) sulfate with ascorbic acid, using different native cyclodextrins (NCDs) (a-, b-, or c-NCD) as stabilizing agents.

Cu-NPs were characterized by scanning electron microscopy-energy dispersive spectroscopy (SEM-EDX), powder X-ray diffraction (^RD) and transmission electron microscopy (TEM).

The pattern showed in the typical selected area electron diffraction (SAED) and lattice fringes, evidence that the crystalline structure of Cu-NPs is face-centered cubic (FCC) with a (1 1 1), (200) and (220) lattice planes of Cu.

The analysis of the TEM images show that the size of the Cu-NPs depends on the type of native cyclodextrin (NCD), also it was observed that the nanoparticles are spherical and with a size between ~2 and 33 nm.

The smaller Cu-NPs were obtained with a-NCD (mode 4 nm), while the nanoparticles obtained with b-NCD show the narrow size distribution (mode 6.5 nm).

The average particle size and particle size distribution of Cu-NPs depend upon the type of CDs.