article · Green Processing and Synthesis
Silver nanoparticles can be produced through an eco-friendly biological route using an aqueous leaf extract of the Origanum majorana plant combined with silver nitrate solution. Structural examination demonstrates that the resulting nanoparticles are spherical, possess an average size of 35 nanometres, and exhibit both monocrystalline and polycrystalline forms. Plant molecules serve as effective bioreducing and capping agents, providing strong electrostatic stability confirmed by a zeta potential of minus 39 millivolts. Optical analyses reveal a surface plasmon resonance peak at 440 nanometres alongside a fluorescence emission peak at 466 nanometres. Electrochemical testing through cyclic voltammetry further establishes electrochemical activity at 0.39 millivolts. These stable, plant-derived metallic nanomaterials present distinct physical and optical characteristics suitable for industrial and healthcare uses.
Green synthesis offers an environmentally friendly alternative to conventional chemical production of nanomaterials by replacing hazardous reagents with plant extracts. Using Origanum majorana yields naturally capped, stable nanoparticles with measurable electrochemical and optical behaviours. Establishing reliable, low-toxicity synthesis methods is fundamental to developing sustainable materials for broader technological and therapeutic sectors.
The findings point to potential utility across industrial and medical settings, offering relevance to nanomaterial manufacturers and healthcare technology developers. Nevertheless, this work remains early-stage laboratory characterisation centred on physical, optical, and electrochemical properties. Because the research does not include functional validation, efficacy testing, or processing scale-up, considerable applied development will be required before commercial applications can be realised.
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Abstract Silver nanoparticles (AgNPs) were biologically synthesized in an eco-friendly manner using aqueous leaf extract of Origanum majorana plant and silver nitrate (AgNO 3 ) solution. Size, shape, and crystallinity of the biosynthesized AgNPs were determined by using a transmission electron microscope (TEM). Zeta potential analyzer was used to prove the stability of the metallic nanoparticles, while Fourier transform infrared spectroscopy was used to identify the bioreducing and capping agents. AgNPs were electrochemically investigated using cyclic voltammetry (CV), while the optical properties of the metallic nanoparticles were studied using UV-Vis and fluorescence spectroscopies. According to TEM images, AgNPs are spherical with an average size of 35 nm. TEM also refers to the presence of mono and polycrystalline AgNPs. The value of zeta potential (−39 mV) proved the stability of AgNPs caused by capping molecules of O. majorana plant. CV studies showed that AgNPs were electrochemically investigated at 0.39 mV. AgNPs showed a surface plasmon resonance peak at 440 nm, while the emission peak was detected at 466 nm. These nanoparticles are promising for many industrial and medical applications.
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DOI: 10.1515/gps-2016-0183
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