Study of influential factors in synthesis and characterization of cobalt oxide nanoparticles

Abstract

Green chemistry approaches for the synthesis of metallic nanoparticles have become a new and promising field of research in recent years. Synthesis of metal nanoparticles [like gold (Au), silver (Ag), lead (Pb), platinum (Pt), copper (Cu), iron (Fe), cadmium (Cd), and other metal oxides such as titanium oxide (TiO), zinc oxide (ZnO), etc.] by various chemical and physical approaches as well as the biological approaches mediated by number of microorganisms have been actively found. Plant-mediated synthesis approaches are found to be more reliable and economic route to synthesize these metal nanoparticles. Owing to the biodiversity of plant biomasses, the actual mechanism by which the plant constituents have contributed to the synthetic process is yet to be fully known. Although the feasibility of controlling, the size and shape of nanoparticles by variation in reaction conditions have been demonstrated in many studies. Conventionally, nanoparticles are synthesized by chemicals and physicochemical methods using several chemicals which later on become accountable for various risk due to their general toxicity, so that solving the objective biological approaches is coming up to fill these gaps. The plant-mediated synthesis process undergoes highly controlled approaches for making them suitable for metal nanoparticle synthesis. In addition, biological synthesis of metallic nanoparticles is inexpensive, one-step, and eco-friendly method. In addition, the plant-mediated nanoparticles are used as potential pharmaceutical agents for various diseases such as malaria, HIV, cancer, hepatitis, and other diseases. Including this some other relevant information regarding nanopharmaceutical products, companies that are involve in the manufacturing and commercialization process and their clinical trial status are also discussed. This review article gives an overview of the plant-mediated synthesis of metal nanoparticles, possible compounds, and mechanisms that might be responsible for the reduction process as well as the potential pharmacological applications, currently available nanopharmaceutical products and their marketing status.

Synthesis, Characterization, Optical, and Magnetic Properties of Co3O4 Nanoparticles by Quick Precipitation

“…shows the Tauc plot (αhυ) 2 against hυ by extrapolating the curve to photon energy axis the optical energy band gap was calculated. Calcium cobaltite prepared in this work, cobalt exists in the octahedra of oxygen ions with Co 3+ (high spin e g 2 t 2g 4 / low spin e g 0 t 2g 6 ) ions ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 7 occupying tetrahedral and octahedral sites, respectively. The following equation.…”

“…Cobalt oxide is a well-known p-type semiconducting material and its optical properties have attracted considerable attentions [1][2][3][4][5][6][7][8]. In solid state reaction, to synthesizing Co 3 O 4 powders are by decomposing the cobalt carbonate to cobalt oxide powders.…”

Voltammetric and Impedimetric Detection of Norfloxacin at Co Nanoparticle Modified Polymer Composite Electrodes

“…The HRTEM image shows an agglomeration of cobalt nanoparticles, without distinction of individual particles in terms of shape and size (Figure 2a). A study conducted by [24], for synthesis of cobalt oxide nanoparticles reported that at temperatures higher than 60 °C agglomeration is likely to occur which causes the amorphous percentage of the sample to increase. Agglomeration may also be exaggerated by not washing the nanoparticles sufficiently after the synthesis.…”

Synthesizing efficacious genistein in conjugation with superparamagnetic Fe 3 O 4 decorated with bio-compatible carboxymethylated chitosan against acute leukemia lymphoma

“…In the spectra of Fe 3 O 4 -CMC nanoparticles, the main absorption peaks are at 1629 cm − 1 and 1415 cm − 1 wave numbers. Descending of 1637 cm − 1 and 1423 cm − 1 to lower wave numbers of 1629 cm − 1 and 1415 cm − 1 can be related to the successful bonding between the hydroxyl groups of the Fe 3 O 4 nanoparticles and the carboxyl groups of CMC [26] (Fig. 5d).…”