Abstract
In this contribution, a totally ecofriendly synthesis of silver nanoparticles from aqueous dissolution of polysaccharides is reported. The synthesis of nanoparticles was performed using aqueous dissolutions of silver nitrate (AgNO3) and carboxymethyl-cellulose (CMC) as both reducing and stabilization agent and using different AgNO3 : CMC weight ratios. Resultant yellowish to reddish dispersions were characterized by means of transmission electron microscopy and their related techniques, such as bright field and Z-contrast imaging and electron diffraction, as well as ultraviolet-visible and infrared spectroscopic techniques. The experimental evidence suggests that the morphology and particle size distribution of the silver nanoparticles depend on the AgNO3 : CMC weight ratio. This feature seems to be related to the stabilization given by the CMC matrix, which, according to our experimental findings, is steric in nature. Regarding such experimental evidence, a synthesis mechanism in which CMC acts as stabilizer and reducing agent is proposed.
Highlights
The synthesis of metal nanostructures has been extensively studied due to their potential applications in technological fields such as electronics, optics, and medicine [1,2,3]
The synthesized silver nanoparticles display a quasi-spherical morphology, according to the micrographs obtained from STEM technique
The bright field (BF) images and the selected area electron diffraction (SAED) patterns identify the crystalline arrangement present in the synthesized nanoparticles as that reported for silver
Summary
The synthesis of metal nanostructures has been extensively studied due to their potential applications in technological fields such as electronics, optics, and medicine [1,2,3]. We propose a simple one-pot totally eco-friendly approach for the preparation of AgNPs, from aqueous dissolutions of the polysaccharide CMC as reducing and stabilization media, that do not use nor produce any harmful residue Following this route, it is safe to use high concentrations of CMC for the efficient reduction of silver ions in aqueous dissolutions and to give narrow particle size distribution of AgNPs, even at lower AgNO3/CMC weight ratios than that reported in the literature [9, 15]. The interactions between CMC functional groups and the synthesized nanoparticles were evaluated by Fourier transform infrared spectroscopy (FTIR) using a Thermo-Scientific Nicolet spectrometer In this case, the preparation of the specimens was performed as follows: 6 drops of diluted dispersions of the samples were added to 60 mg of powdered potassium bromide (KBr, FTIR grade ≥ 99%), mixed, and dried at 60∘C for 24 hours. Dried mixtures were pressed to get films of the specimens, from which the IR spectra were recorded
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