Correlating the size and cation inversion factor in context of magnetic and optical behavior of CoFe₂O₄ nanoparticles

Abstract

Herein, the size dependent behavior of cobalt ferrite nanoparticles was investigated using synchrotron radiation based techniques.

A controllable one-pot hydrothermal synthesis of spherical cobalt ferrite nanoparticles: synthesis, characterization, and optical properties

“…The optical band gap energy ( E g ) can be determined by using the following relationship (2). 68 The estimated band gap values for CF-AG 0 and CF-AG 0.5 samples are 1.61 and 1.68 eV, respectively.where λ is the wavelength of the absorption edge, which is determined by the intercept on the wavelength axis as shown in the inset of Fig. 11.…”

“…As described in eqn (6), the shift in bulk band gap energy increases with size approximately to or less than the bulk exciton-Bohr radius. 68,71 where E sh is the shift from bulk band gap energy, R is the crystallite radius, m h and m e are defined as the effective masses of the hole and electron carriers, respectively, S⃑ represents the position vector corresponding to the effective charge distribution of the system, and a n is a quantity that is based on ε 1 and ε 2 , where ε 1 and ε 2 are the dielectric coefficient of the material and surrounding medium, respectively. In the literature review, Andhare et al demonstrated the influence of Zn doping on optical, structural, and magnetic properties of cobalt ferrite nanoparticles, which were synthesized by the co-precipitation method.…”

“…The optical band gap energy (E g ) can be determined by using the following relationship (2). 68 The estimated band gap values for CF-AG 0 and CF-AG 0.5 samples are 1.61 and 1.68 eV, respectively.…”

“…As described in eqn (6), the shi in bulk band gap energy increases with size approximately to or less than the bulk exciton-Bohr radius. 68,71…”

Approaches to synthesize MgO nanostructures for diverse applications

“…Due to small dimension of nanostructures, some exciting phenomena like quantum confinement [ 12 , 13 , 14 , 15 ] and phonon confinement in these nanostructures take place [ 16 , 17 , 18 ]. This causes modulation in the optical behavior of nanostructures of various materials like Au, Ag [ 19 ], ZnO [ 20 ] and similar other systems [ 21 , 22 ].…”