Green synthesis of Co₃O₄nanoparticles viaAspalathus linearis: Physical properties

Abstract

This study reports on the bio-synthesis and the main physical properties of p-type Co 3 O 4 nanoparticles for the first time by a completely green chemistry process using Aspalathus linearis's natural extract as an effective chelating agent. Their surface/interface and optical properties are reported. In addition to the X-ray diffraction investigations, the Raman, and infrared as well as X-ray photoelectron spectroscopies confirmed the single phase of the Co 3 O 4 nanoparticles. As their average size can be as low as 〈fparticle〉 ∼3.6 nm, the reticular atomic plans are under a slight compressive state. ARTICLE HISTORY

A Green Strategy to Synthesize Environment Friendly Metal Oxide Nanoparticles for Potential Applications – A Review

“…It was concluded that the phenolic compounds present in plant extracts showed higher antioxidant property which helps in the reduction process of metal ions. The content of proteins, lipids as well as amino acids helps to stabilize the NPs and deter the agglomeration [24]. Plant-mediated metal oxide NPs showed best antimicrobial and anticancer activities [40].…”

“…The Raman mode at 684.5/cm is attributed to characteristics of the octahedral sites A 1g The E g , and F 2g modes are related to the combined vibrations of a tetrahedral site and octahedral oxygen motions for cobalt oxide NPs. Due to stress/strain, the vibrational shift will occur [24]. Raman spectra of carbon have two main characteristics called G band and D band which implies sp 2 hybridization.…”

“…It was centrifuged at 1000 rpm 3 times for 10 minutes. It was annealed at different temperatures [24]. T. chebula plant seeds were dried under sunlight and they were ground into fine powder.…”

“…A. linearis extract was used to synthesize cobalt oxide NPs. The size of the particle was calculated as 2-7 nm and in quasi-spherical shape [24]. The tannin is extracted from A. mearnsii to synthesize iron oxide NPs.…”

Synthesis and characterization of novel spinel Zn 1.114 La 1.264 Al 0.5 O 4.271 nanoparticles

“…The bands centered at 1542.87 and 1630.52 cm À1 could be attributed to the bending vibrational frequency of OH groups due to the absorption of atmospheric water vapor by the nanoparticles [56]. The band at 2350.99 cm À1 may be related to the stretching frequency of the C]O bonds due to the possible adsorbed CO 2 molecules from atmosphere on the nanoparticles [57].…”