Effect of Ni doping on structural, optical and gas sensing properties of ZnO films for the development of acetone sensor devices

Excitation wavelength dependent nonlinear absorption mechanisms and optical limiting properties of Bi12SiO20 single crystal

Abstract Herein, a nanostructured ZnO/Fe2O3 heterostructure and its graphene (Gr)-reinforced composite (ZnO/Fe2O3@Gr) have been synthesized via co-precipitation and post-ultrasonication approaches. The formation of heterojunction at the ZnO–Fe2O3 interface reduces the bandgap and keeps the electron-hole pairs apart. The graphene plays multiple roles to boost the dye removal effectively of the ZnO/Fe2O3@Gr composite. The charge transfer aptitude, isolation of charge carriers, and resistance at the ZnO/Fe2O3-Graphene interface were also examined by Mott–Schottky, chronoamperometric, and impedance experiments. The performance of an as-synthesized ZnO/Fe2O3@Gr catalyst was explored for the mineralization of a cationic dye (crystal violet, CV) and phenol in visible-light (λ above 400 nm) for 2 h. The ZnO/Fe2O3@Gr catalyst has mineralized 92.8 % CV dye and 50.86 % phenol after 2 h of visible-light irradiation. Moreover, the mineralization constant (k) comes to be 0.019 min−1, which is 4.2, 2.3, and 1.7 times higher than ZnO, Fe2O3, and ZnO/Fe2O3 catalysts, respectively. Increasing the dosage of the ZnO/Fe2O3@Gr catalyst from 10 mg to 30 mg increased the rate constant from 0.006 min−1 to 0.019 min−1, thereby increasing the efficiency of CV dye mineralization from 58.5 % to 92.8 %. The tuned photocatalytic activity of the ZnO/Fe2O3@Gr is due to the formation of the ZnO–Fe2O3 heterostructure and, preferentially, its conductive graphene. In fact, graphene serves the roles of an efficient electron collector, a transporter, and an effective UV/Vis light absorber, enabling the creation of active species that further boost the photocatalytic performance. According to the results of this study, the easiest and cheapest way to deal with toxic dyes in industrial waste is to make photocatalysts from semiconductive and carbonaceous materials that have integrated properties.

Facile synthesis of a ZnO/Fe2O3 heterostructure and its graphene-reinforced composite for boosting the photo-mineralization of crystal violet and phenol

Probing into the physicochemical consequences of pristine and X0.06-Ni0.94O (X=Co, Fe, Cu) nanoparticles for bactericidal, antifungal and hemolytic competency

In-situ growth of binder-free Cr/NiO thin film electrodes via co-sputtering for asymmetric supercapacitors

Structural, Third Order Nonlinear and Magnetic Properties of Pristine and Ni-doped CuO nanoparticles: Diluted Magnetic Semiconductors

The Role of Defects on Linear and Nonlinear Optical properties of Pristine and Nickel doped Zinc Oxide Nanoparticles

La2CoMnO6 double perovskite was synthesized via modified combustion route. XRD with Rietveld refinement confirms monoclinic structure with space group of P21/n. Irregular shaped porous morphology was determined from FE-SEM and elemental analysis was done using EDAX spectra. Existence of mixed valence state of Co and Mn were verified by XPS spectra and its bandgap was determined using Tauc plot. Vibrational analysis validates the formation of perovskite phase and degeneracy in Raman modes/thermal broadening provides signature vibrational bands corresponding to stretching and bending motions of MnO6 and CoO6. Supercapacitor performance using La2CoMnO6 as electrode material exhibits 84% of cyclic stability after 500 cycles. The material exhibits a combined saturable and reverse saturable absorption behaviour under open aperture and self-defocusing nature due to thermal effect under closed aperture measurements with Z-scan method, using continuous wave irradiation. These findings confirmed that La2CoMnO6 manganite can be used for energy storage and photonic applications. 

Third order nonlinear optical properties and electrochemical performance of La2CoMnO6 double perovskite

Role of surface defects in the third order nonlinear optical properties of pristine NiO and Cr doped NiO nanostructures

Tunable Photoluminescence Emission and Third Order Optical Nonlinearity in Sm2/3Cu3Ti4O12 Ceramics for Optical limiting Applications

Jibi Kunjumon

Papers

Structural, Third Order Nonlinear and Magnetic Properties of Pristine and Ni-doped CuO nanoparticles: Diluted Magnetic Semiconductors

The Role of Defects on Linear and Nonlinear Optical properties of Pristine and Nickel doped Zinc Oxide Nanoparticles

Third order nonlinear optical properties and electrochemical performance of La2CoMnO6 double perovskite

Role of surface defects in the third order nonlinear optical properties of pristine NiO and Cr doped NiO nanostructures

Tunable Photoluminescence Emission and Third Order Optical Nonlinearity in Sm2/3Cu3Ti4O12 Ceramics for Optical limiting Applications