Abstract
In the present work, cobalt-chromite-based pigment Co1-xNixCr2O4 chromate powder and nanoparticles with various transition metal concentrations (x = 0.2, 0.4, 0.6, and 0.8) were manufactured by applying aqueous synthesis approaches and sol–gel synthesis routes. XRD analysis of the powder shows that all samples formulated by the sol–gel method were crystalline with a spinel structure. Chromites show green color with a higher nickel concentration, while Co-substituent shows blackish pigments. Samples were annealed at distinct temperatures ranging from 600 °C to 750 °C. The nanoparticles obtained were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy (RS), photoluminescence (PL), and energy-dispersive X-ray spectroscopy (EDS). The particle size of the parent compound (CoCr2O4) ranges from 100 nm to 500 nm, as measured by SEM. The tendency of particles to form aggregates with increasing annealing temperature was observed. These compounds may be successfully used as an effective doped nickel-cobalt ceramic pigment.
Highlights
Nanoparticles (NPs) are made up of a large number of atoms or molecules bonded with each other with a total size varying from 1 nm to around 100 nm
We report that the sol–gel process needs low temperature and less calcination to achieve the desired product [19]
Photoluminescence of the CoNiCr2O4 nanoparticles is performed to investigate the suitability of these compounds and nanoparticles in optical and photonic applications
Summary
Nanoparticles (NPs) are made up of a large number of atoms or molecules bonded with each other with a total size varying from 1 nm to around 100 nm Due to their very small sizes, NPs possess an extraordinarily high surface-area-to-volume ratio, which changes their physical-chemical properties compared to their macroscale counterparts. Due to their unique structural, magnetic, mechanical, and electrical properties, NPs are used in a wide range of applications including biosensing, drug delivery, bioimaging, catalysis, nanomanufacturing, lubrication, electronics, textile manufacturing, and water treatment systems [1,2,3]. Lowering temperature below 65 K, the crystal structure further transforms into the orthorhombic phase [16]. Photoluminescence of the CoNiCr2O4 nanoparticles is performed to investigate the suitability of these compounds and nanoparticles in optical and photonic applications
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