Green synthesis of silver nanoparticles using a Lavandula angustifolia Flowers extract and study of UV-vis spectra of synthesized Ag-NPs in Lavandula angustifolia Flowers extract at different times

Among various metals, silver nanoparticles (AgNPs) are of particular interest due to their remarkable antimicrobial and localized surface plasmon resonance properties, which render them unique properties such as broad-spectrum antimicrobial [1،2]. Lavandula angustifolia, known as Spike lavender or Portuguese lavender, is a flowering plant in the family Lamiaceae, The flowers and leaves of this plant are used as a herbal medicine, in the form of a herbal tea [3]. In this paper, a green synthesis route was followed, in order to obtain silver nanoparticles with possible utilization for medical devices.The “Green” synthesis of metallic nanoparticles and investigation of their optical properties has become a useful application between nanoscience and medicine. In this work, silver nanoparticles (Ag-NPs) were successfully prepared through green method by treating silver ions with Lavandula angustifolia Flowers extract . Preparation of Ag-NPs in silver nitrate solution (0.00 1 M) resulted in small and spherical shapes of Ag-NPs with a mean diameter of 50 nm. The formation of Ag-NPs was approved by surface Plasmon resonance (SPR) absorption peaks, using UV–vis spectrophotometer The obtained curves in Fig display the UV-vis spectra from the Lavandula angustifolia Flowers extract Ag-NPs at 40 °C and different reaction times (3 to 72 h) in yellowish aqueous solutions. The existence of a sharp and strong SPR peak at the wavelength of maximum absorbance (λmax), which was about 436 nm, indicates the formation of Ag-NPs nm, indicates the formation of Ag-NPs.