Role of Phenol Derivatives in the Formation of Silver Nanoparticles

Abstract

We demonstrate that dihydroxy benzenes are excellent reducing agents and may be used to reduce silver ions to synthesize stable silver nanoparticles in air-saturated aqueous solutions. The formation of Ag nanoparticles in deaerated aqueous solution at high pH values suggests that the reduction of silver ions occurs due to oxidation of dihydroxy benzenes and probably on the surface of Ag2O. Pulse radiolysis studies show that the semi-quinone radical does not participate in the reduction of silver ions at short time scales. Nevertheless, results show that primary intermediates undergo slower transformation in the presence of dihydroxy benzenes than in their absence. This slow transformation eventually leads to the formation of silver nanoparticles. The Ag nanoparticles were characterized by UV-vis absorption spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). XRD and TEM techniques showed the presence of Ag nanoparticles with an average size of 30 nm.

Silver nanoparticles stabilized by tannin grafted collagen fiber: synthesis, characterization and antifungal activity

“…The amorphous peak of CF at 23°is clearly observed in Fig. 4, while the XRD spectrum of BT-CF-AgNPs exhibits a weak peak at 39.3°, which is consistent with the (111) plane diffraction peak of the Ag crystal (Jacob et al 2008). The broad and weak intensity XRD peak of the Ag (111) face should be attributed to the small crystalline and good dispersion of Ag NPs.…”

Preparation, characterization, surface modification and redox reactions of silver nanoparticles in the presence of tryptophan

“…Thus, it seems that in the reduction of Ag + ion, tryptophan radical does not participate at least initially. The above results corroborate our findings in case of dihydroxy benzene derivatives [24].…”

Silver Nanoparticles

“…A pulse radiolysis technique has been applied to study the reactions of inorganic and organic species in silver nanoparticle synthesis, to understand the factors controlling the shape and size of the nanoparticles synthesized by a common reduction method using citrate ions (as reducing and stabilizing agents) (Pillai and Kamat 2004), and to demonstrate the role of phenol derivatives in the formation of silver nanoparticles by the reduction of silver ions with dihydroxy benzene (Jacob et al 2008). Dihydroxy benzene could be also used to reduce silver ions to synthesize stable silver nanoparticles (with an average size of 30 nm) in air-saturated aqueous solutions (Jacob et al 2008). …”