Abstract
Silver dendritic nanoforests (Ag-DNFs) on silicon (Ag-DNFs/Si) were synthesized through the fluoride-assisted Galvanic replacement reaction (FAGRR) method. The synthesized Ag-DNFs/Si were characterized by scanning electron microscopy, energy-dispersive X-ray spectrometry, inductively coupled plasma mass spectrometry (ICP-MS), reflection absorbance spectrometry, surface-enhanced Raman scattering spectrometry, and X-ray diffractometry. The Ag+ concentration in ICP-MS measurements indicated 1.033 mg/cm2 of deposited Ag synthesized for 200 min on Si substrate. The optical absorbance spectra indicated the induced surface plasmon resonance of Ag DNFs increased with the thickness of the Ag DNFs layer. Surface-enhanced Raman scattering measurement and a light-to-heat energy conversion test presented the superior plasmonic response of Ag-DNFs/Si for advanced applications. The Ag-DNFs/Si substrate exhibited high antibacterial activity against Escherichia coli and Staphylococcus aureus. The large surface area of the dense crystal Ag DNFs layer resulted in high antibacterial efficiency. The plasmonic response in the metal–crystal Ag DNFs under external light illumination can supply energy to enhance bacterial inhibition. High-efficiency plasmonic heating by the dense Ag DNFs can lead to localized bacterial inhibition. Thus, the Ag-DNFs/Si substrate has excellent potential for antibacterial applications.
Highlights
Silver nanoparticles (Ag NPs) have valuable antimicrobial properties, especially against some resistant strains
Many researchers have developed new methods to improve the synthesis of Ag NPs [2,3,4,5,6]
The antibacterial properties of Ag NPs protected in polymer shells [3] or fixed on PMMA fibers [4] can be retained because Ag+ ions are continually released in aqueous solutions [4]
Summary
Silver nanoparticles (Ag NPs) have valuable antimicrobial properties, especially against some resistant strains. Given the critical toxicity of resistant strains, Ag NPs are an attractive option for treating bacterial infections [1]. Many researchers have developed new methods to improve the synthesis of Ag NPs [2,3,4,5,6]. Ghodake et al discovered that with the addition of dilute sodium hydroxide, well-dispersed Ag NPs could be produced in large quantities through the classical nucleation and growth route [5]. The antibacterial properties of Ag NPs protected in polymer shells [3] or fixed on PMMA fibers [4] can be retained because Ag+ ions are continually released in aqueous solutions [4]
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