Silver–Iron Hierarchical Microflowers for Highly Efficient H₂O₂ Nonenzymatic Amperometric Detection

Abstract

This study addresses the fabrication of monodispersed iron-doped silver meso-hierarchical flower-like structures via a facile chemical procedure. The morphology of the obtained silver particles has been tuned by changing the concentration of the structure-directing agent (malonic acid). Ball-shaped silver particles were formed in the absence of malonic acid (MA), while silver particles with craspedia-globosa, chrysanthemum, and dahlia flower-like structures were obtained in the presence of 0.2, 0.5, and 1 mM malonic acid, respectively. The doping of these dahlia flower-like structures with trace amounts of iron (≤5% Fe weight percent) led to the formation of globe-amaranth iron-doped microflowers (AgFe amaranth ). The as-prepared AgFe amaranth exhibited better performance as a nonenzymatic H 2 O 2 sensor compared to undoped silver particles as demonstrated by their higher catalytic activity and stability together with superior sensitivity (1350 μM −1 cm −2 , 61 times higher) and lower detection limit (0.1 μM). These enhancements are attributed to the AgFe unique flower-like structures and to the fact that the iron dopants provide a higher number of electroactive sites and reduce the charge transfer resistance of H 2 O 2 reduction. Additionally, the good stability of AgFe is believed to originate from the faster detachment rate of the in situ-formed gas bubbles from their surfaces compared to undoped silver structures.

Electrodeposition of Silver in a Ternary Deep Eutectic Solvent and the Electrochemical Sensing Ability of the Ag-Modified Electrode for Nitrofurazone

“…Silver nanoparticles have attracted immense attention for many decades because of their diverse applications. The use of silver-based electrochemical sensors for sensing toxicity has attracted considerable interest. − The catalytic activity of such systems depends on the particle size, surface morphologies, and crystal orientation. Regarding this, many studies have reported on the use of an electrodeposition method for fabricating Ag-based sensors.…”

Silver Nanoparticle-Enzyme Composite Films for Hydrogen Peroxide Detection

“…For example, H 2 O 2 is widely used as a fungicide and preservative in foods like milks to kill bacteria and prevent deterioration. However, an excessive level of H 2 O 2 ingestion and accumulation in human system would cause cytotoxic effects on cells, which may result in some cells related diseases such as disorder of central nervous system, cardiovascular diseases, or even worse of tumors and Alzheimer’s . Therefore, developing a facile, efficient, and reliable biosensor platform for real time H 2 O 2 detection is of significance importance and highly demanded.…”

Mixed Co‐Mn Spinel Oxides Based Electrocatalysts for Amperometric Determination of Hydrogen Peroxide

“…Hydrogen peroxide (H 2 O 2 ), an indispensable chemical, plays significant roles in various industries, such as, textile, papermaking, food manufacturing, and pharmaceuticals. [1][2][3] However, in the food industries, the overuse of H 2 O 2 is detrimental for the health of human-beings due to its toxicity according to GB 2760-86 (hygienic standard of food additives of China). In addition, H 2 O 2 has been identified to be involved in many physiological processes, where the high-level secretion of H 2 O 2 from living organisms always associates with some severe illness, like diabetes, cancer, atherosclerosis, Parkinson's disease.…”

“…Hydrogen peroxide (H 2 O 2 ), an indispensable chemical, plays significant roles in various industries, such as, textile, papermaking, food manufacturing, and pharmaceuticals [1–3] . However, in the food industries, the overuse of H 2 O 2 is detrimental for the health of human‐beings due to its toxicity according to GB 2760‐86 (hygienic standard of food additives of China).…”