A photochemical proposal for the preparation of ZnAl2O4 and MgAl2O4 thin films from β-diketonate complex precursors

Engineering of the structural and morphological characteristics of MWCNTs employing a nano-dimensional binary oxide coating with enhanced thermal oxidation resistance properties for the tailoring of their reinforcement potential

“…After deconvolution, the C 1s spectrum clearly revealed two major peaks with binding energies of 284.80 eV and 285.80 eV, corresponding to graphitic carbon (sp 2 CQC) and disordered sp 3 -hybridized carbon (sp 3 C-C) in the MWCNT structure. 66 The spectrum also provides an exciting result, revealing three additional weak peaks at 289.76 eV, 283.2 eV, and 281.79 eV, which are strongly suggestive of the existence of surface carbonate (O-CQO), C-Mg, and C-Al bonds, respectively. 67,68 For the O 1s spectrum, three peaks were clearly identified at 530.68 eV, 532.21 eV, and 533.85 eV, where the first peak might arise from the combined effects of O-C bonds and O sites of the spinel lattice, and the second and third peaks might evolve due to the combined existence of metal-oxygen bonds, OQC linkages, and oxygen in the associative ring structure.…”

“…Thus, connected to the above mechanism, the easy permeance of atmospheric oxygen due to the widely available defective sites results in accelerated oxygen movement, approaching the innermost layer of the MWCNT structure within a very short period of time and thereby resulting in the premature disintegration of the overall crystalline lattice arrangement. 20,66 Since the surface nano-engineering of the as-synthesized CNT-based nano-hybrid structure with a MgAl binary oxide loading concentration of 7.5 wt% has the clearest beneficial impact on the tolerance of the CNT skeletal network to oxidation-induced structural damage, it is important to concentrate on this selected nanohybrid interface while studying the progressive advancement of the high-temperature oxidation reaction. To achieve this, the study of the interfacial region of the prepared nano-hybrid material via efficient characterization techniques is highly desirable to skillfully explore the nature of the interfacial coupling network and subsequently determine the impact of the structure-property relationship on the high-temperatureinduced oxidation mechanism at the nano-hybrid interface.…”

“…67,68 For the O 1s spectrum, three peaks were clearly identified at 530.68 eV, 532.21 eV, and 533.85 eV, where the first peak might arise from the combined effects of O-C bonds and O sites of the spinel lattice, and the second and third peaks might evolve due to the combined existence of metal-oxygen bonds, OQC linkages, and oxygen in the associative ring structure. 66,[69][70][71] Detailed analysis of the Al 2p and Mg 1s peaks strongly highlights the existence of Al-O and very weak Al-OH bonds at 74.88 eV and 75.79 eV, respectively, and Mg-O bonds at 1304 eV, which is in line with the results obtained from the FTIR spectra of both the heat-treated MgAl 2 O 4 spinel phase (Fig. S1, ESI †) and the thermally treated MgAl-binary-oxide-decorated CNT-based nano-hybrid structure (Fig.…”

Optical properties of Cr doped ZnAl2O4 nanoparticles with Spinel structure synthesized by hydrothermal method

“…According to the metal cation distribution, the general chemical formula of spinel structure can be written as (A 1−x B x )[A x B 2-x ]O 4 , where ()represents tetrahedral position, [] represents octahedral position, and x is the inversion coefficient. When x=0, AB 2 O 4 is orthospinel structure; x=1, AB 2 O 4 is anti-spinel structure, while 0<x<1, AB 2 O 4 is the mixed spinel structure [11][12][13].…”

Magnetically Recoverable Cr and Mn Co-Doped Zn0.95−xCr0.05MnxAl2O4 Nanoparticles for Dye Degradation Under Simulated Sunlight Irradiation

“…[13][14][15] The chemical formula of spinel structure metal oxides is generally expressed as AB 2 O 4 , where A represents a bivalent metal cation occupying the tetrahedral position, the tetrahedral gap formed by four oxygen ions, while B represents a trivalent cation occupying the octahedral position, the octahedral void formed by six oxygen ions. [16][17][18] ZnAl 2 O 4 has been widely used in many fields, such as magnetic storage devices, catalysts, photosynthesis enhancement, high-temperature ceramics, laser and fluorescent substrate materials and sensing and dielectric materials. [19][20][21][22][23][24][25] However, the photocatalytic activity of ZnAl 2 O 4 is affected by the fast recombination speed and the weak reducing capacity of photocarriers due to the relative positive conductance band potential.…”