Abstract
Biosynthesis of silver nanoparticles (AgNPs) was achieved using extract of Chenopodium ambrosioides as a reducer and coating agent at room temperature (25°C). Two molar solutions of AgNO3 (1 mM and 10 mM) and five extract volumes (0.5, 1, 2, 3, and 5 mL) were used to assess quantity, shape, and size of the particles. The UV‐Vis spectra gave surface plasmon resonance at 434–436 nm of the NPs synthesized with AgNO3 10 mM and all extract volumes tested, showing a direct relationship between extract volumes and quantity of particles formed. In contrast, the concentration of silver ions was related negatively to particle size. The smallest (4.9 ± 3.4 nm) particles were obtained with 1 mL of extract in AgNO3 10 mM and the larger amount of particles were obtained with 2 mL and 5 mL of extract. TEM study indicated that the particles were polycrystalline and randomly oriented with a silver structure face centered cubic (fcc) and fourier transform infrared spectroscopy (FTIR) indicated that disappearance of the –OH group band after bioreduction evidences its role in reducing silver ions.
Highlights
Structures smaller than 100 nm have unusual optical, chemical, photoelectrochemical, and electronic properties
Some studies about biosynthesis of gold and silver nanoparticles based on plant extracts [3] include the use of Citrus sinensis [4], Gardenia jasminoides Ellis [1], Brassica juncea, Medicago sativa, and Helianthus annuus [5,6,7], Opuntia ficus-indica [8], Coriandrum sativum [9], Hibiscus rosa sinensis [10], Capsicum annum L. [11], Ocimum sanctum and Vitex negundo [12, 13], Chenopodium album [14], Avena sativa [15], and Tridax procumbens, Jatropha curcas, Calotropis gigantea, Solanum melongena, Datura metel, Carica papaya, and Citrus aurantium [16]
NPs produced with 10 mM AgNO3 and 1 mL of leaf extract showed the best surface plasmon resonance (SPR) (Figure 3). These results suggested the great stability of the system and the potential of this green protocol
Summary
Structures smaller than 100 nm have unusual optical, chemical, photoelectrochemical, and electronic properties. Some studies about biosynthesis of gold and silver nanoparticles based on plant extracts [3] include the use of Citrus sinensis [4], Gardenia jasminoides Ellis [1], Brassica juncea, Medicago sativa, and Helianthus annuus [5,6,7], Opuntia ficus-indica [8], Coriandrum sativum [9], Hibiscus rosa sinensis [10], Capsicum annum L. [11], Ocimum sanctum and Vitex negundo [12, 13], Chenopodium album [14], Avena sativa [15], and Tridax procumbens, Jatropha curcas, Calotropis gigantea, Solanum melongena, Datura metel, Carica papaya, and Citrus aurantium [16].
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