Synthesis of Water-Dispersible Silver Nanoparticles by Thermal Decomposition of Water-Soluble Silver Oxalate Precursors

Abstract

Silver oxalate, one of the coordination polymer crystals, is a promising synthetic precursor for transformation into Ag nanoparticles without any reducing chemicals via thermal decomposition of the oxalate ions. However, its insoluble nature in solvents has been a great disadvantage, especially for systematic control of crystal growth of the Ag nanoparticles, while such control of inorganic nanoparticles has been generally performed using soluble precursors in homogeneous solutions. In this paper, we document our discovery of water-soluble species from the reaction between the insoluble silver oxalate and N,N-dimethyl-1,3-diaminopropane. The water-soluble species underwent low-temperature thermal decomposition of the oxalate ions at 30 °C with evolution of CO2 to reduce Ag+ to Ag0. Water-dispersible Ag nanoparticles have been successfully synthesized from the water-soluble species in the presence of gelatin via similar thermal decomposition at 100 °C. The gelatin-protected and water-dispersible Ag nanoparticles with a mean diameter of 25.1 nm appeared. In addition, antibacterial activity of the prepared water-dispersible Ag nanoparticles has been preliminarily investigated.

Eco-friendly synthesis of silver nanoparticles using leaf extract of Flemingia wightiana: spectral characterization, antioxidant and anticancer activity studies

“…The market of AgNPs have been increased year to year due to their vast usage in the industries related to food packaging, wound dressings, diagnostic kits and other medical equipments [23][24][25]. Different chemical and physical methods including thermal decomposition [26], laser ablation [27], electrochemical [28], photochemical [29], sonochemical [30], gamma-irradiated [31], ultrasound assisted [32], polyaniline [33], chemical reduction [34], and lithography [35] methods have been successfully reported for the preparation of AgNPs. But these methods employ radiations and toxic chemicals.…”

Potential anticancer activity of biogenic silver nanoparticles using leaf extract of Rhynchosia suaveolens: an insight into the mechanism

“…Different chemical and physical synthesis methods of AgNPs have been reported. Well-known examples include electron and gamma irradiation, thermal decomposition, laser ablation, microwave processing [14][15][16][17][18], ultrasonic irradiation, polyol method [19], electrochemical assisted, polyaniline assisted [20], photochemical and chemical reduction methods [21,22]. But all of these methods possess certain demerits including application of toxic radiations and hazardous chemicals, laborious, time consuming and expensive approaches, environmental and health risks.…”

Non‐Enzymatic Electrochemical Biosensor for Dopamine Detection Using MoS2/rGO/Ag Nanostructure

“…To benefit further, the incorporation of Noble metal nanoparticles like Au, Pt, Ru has been witnessed in this field but the higher cost and synthetic complexities play an unpromising role in the synthesis. To overcome this, Silver nanoparticles (AgNPs) synthesized by bio‐mediated method could be seen as a cost‐efficient, green and novel alternative, with the added advantage of minimized synthetic complexities [24] …”