Abstract
Gold nanoparticles (AuNPs) were synthesized using a facile solvothermal method with alginate sodium as both reductant and stabilizer. Formation of AuNPs was confirmed by UV-vis spectroscopic analysis. The synthesized AuNPs showed a localized surface plasmon resonance at approximately 520–560 nm. The AuNPs were characterized using transmission electron microscopy, X-ray diffraction and dynamic light scattering. Transmission electron microscopy revealed that the AuNPs were mostly nanometer-sized spherical particles. Powder X-ray diffraction analysis proved the formation of face-centered cubic structure of Au. Catalytic reduction of 4-nitrophenol was monitored via spectrophotometry using AuNPs as catalyst, and further a non-enzymatic sensor was fabricated. The results demonstrated that AuNPs presented excellent catalytic activity and provided a sensitive response to H2O2 detection.
Highlights
Gold nanoparticles (AuNPs) have recently received intensive interest because of their unique physicochemical properties and their various potential chemical applications [1,2,3]
Studies have reported that many natural compounds, such as those derived from fungi, algae, bacteria, and plants, were used in green synthesis of AuNPs [7,8,9,10]
We focused our attention on natural polysaccharide extracted from seaweed, which is a proven source of bioactive compounds [15]
Summary
Gold nanoparticles (AuNPs) have recently received intensive interest because of their unique physicochemical properties and their various potential chemical applications [1,2,3]. Studies have reported that many natural compounds, such as those derived from fungi, algae, bacteria, and plants, were used in green synthesis of AuNPs [7,8,9,10] These natural compounds-mediated procedures for synthesis of AuNPs represent advantages over conventional chemical and physical methods, as they are low-cost, energy-efficient, and nontoxic green routes [11,12,13,14]. A great number of AuNPs tend to aggregate and change shape due to the poor balance between the nucleation and growth processes and the high surface energy, which results in a remarkable decrease in their catalytic and electrochemical activity and selectivity undesirably To overcome these obstacles, in this study, AuNPs were stabled and dispersed by alginate. Non-enzymatic H2 O2 sensor was fabricated with the as-prepared alginate-AuNPs and electrochemical property of the sensor was investigated
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