Optical characterization of nanostructured MnO2ZnO thin films prepared from acetate-based sol−gel precursors

Falahatgar, S.S.; Ghodsi, F. E.

doi:10.1016/j.ijleo.2015.10.062

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…For its broad array of applications in molecular adsorption, biosensing, energy storage, lithium ion batteries, electrochemical capacitors, electrochromic devices, high performance electrochemical electrodes, optical devices, and photocatalysis, MnO 2 is one of the most appealing n-type semiconductors (5,6).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Photocatalytic Activities of Co₃O₄- MnO₂ - ZnO Ternary Nanoparticles

David¹,

Vedhi²

2022

ECS Trans.

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Co3O4 - MnO2 - ZnO NPs were synthesized by making use of the equimolar solutions of cobalt chloride, manganese(II) sulfate and zinc sulfate in aqueous sodium hydroxide and refluxed at elevated temperature. The synthesized mixed nano oxides were characterized by FT-IR, XRD, UV - Vis DRS, TEM, SAED, SEM, EDAX, AFM, TG/DTG and DSC. The FTIR spectra confirm the presence of M-O bonds (M = Co, Mn, Zn). The size of the Co3O4 - MnO2 - ZnO NPs are found to be 10.13 - 25.65nm through XRD studies. The XRD patterns also expose that the particle size is significantly increased with increasing concentration of the precursors. UV-Vis diffuse reflectance spectra (DRS) show that the ternary nanoparticles can be activated by UV and visible light illumination. The TEM, SEM and AFM micrographs of 0.1M Co3O4 - MnO2 - ZnO NPs show roughly spherical shape with size ranging from 10 - 30nm. EDAX analysis confirms the presence of Co, Mn, Zn and O. From TG-DTG and DSC studies, it is found that Co3O4 - MnO2 - ZnO NPs are thermally stable. The photocatalytic activity of Co3O4 - MnO2 - ZnO NPs was determined for degradation of methylene blue (MB) under sunlight. Among the samples, 0.1M Co3O4 - MnO2 - ZnO NPs exhibits the best performance (91.98%) for the degradation of MB in 90 min of irradiation time under sunlight. The factors influencing the photocatalytic activity are pH of dye solution, photocatalyst particle size, photocatalyst dosage and dye concentration.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Photocatalytic Activities of Co₃O₄- MnO₂ - ZnO Ternary Nanoparticles

David¹,

Vedhi²

2022

ECS Trans.

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“…[10][11][12][13][14] Furthermore, pristine and doped ZnO thin films have a wide range of technological applications in light emitting diodes (LEDs), gas sensors, photocatalysts, solar cells, and other photonic devices. [15][16][17] Sol-gel 18,19 technique, chemical vapor deposition (CVD), 20 electron beam evaporation, 21 sputtering, 22 pulsed laser deposition (PLD), 23 and chemical bath methods (CBD) 24 are among the most common deposition processes used to fabricate the ZnO thin films. In fact, the photoelectric properties are greatly dependent on the fabrication process.…”

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confidence: 99%

Nickel Doped Zinc Oxide Thin Films for Visible Blind Ultraviolet Photodetection Applications

Agrohiya

Dahiya²,

Goyal³

et al. 2022

ECS Sens. Plus

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The current research aims to investigate the effect of nickel doping on the structural and opto-electrical characteristics of zinc oxide thin films. Sol-gel spin coating technique has been utilized to deposit Zn1-xNixO (x=0, 0.005, 0.010, and 0.015) films on glass substrates. X-ray diffraction (XRD) analysis confirms the formation of crystalline zinc oxide thin films with hexagonal wurtzite structure. Williamson-Hall analysis has been performed to study the individual contribution of lattice strain and crystallite size to the peak broadening in the XRD pattern. Scanning electron microscopy (SEM) and UV-Visible spectroscopic techniques have been used to examine the surface morphology and optical properties of the deposited films. Transient photocurrent measurements have been performed on all the films under the exposure of ultraviolet (UV) light of wavelengths 365 and 254 nm with on/off cycle of 100 seconds, and various device key parameters such as sensitivity, responsivity and quantum efficiency, etc. have been determined. Sensitivities of the fabricated photodetectors (PDs) are found to be 5463%, 3809%, 3100%, and 831% for pristine ZnO, Zn0.995Ni0.005O, Zn0.99Ni0.01O, and Zn0.985Ni0.015O, respectively. The UV photodetection mechanism, which is based on the interaction between chemisorbed oxygen on the surface of ZnO and photo-generated holes, has been thoroughly discussed.

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Superior Microwave Absorption Based on ZnO Capped MnO₂ Nanostructures

Duan

Pang

et al. 2020

Adv Materials Inter

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Dielectric composites based on polybasic components with hierarchical structures have promising potentials for electromagnetic absorber. However, strategy to strengthen coupling of transition metal oxides still demands to be optimized to enhance electromagnetic loss. Herein, inspired by the hierarchical structure of balsam pear, ultrafine ZnO is uniformly distributed and tightly capped in MnO2 by self‐assembly hydrothermal method. The unique hierarchical structure provides abundant polarization centers with large specific surface area. The compositions promote attenuation performance of electromagnetic waves, enhance relative permittivity and satisfy impedance matching as compared with that of pure ZnO or MnO2. The effective bandwidth (RL< −10 dB) reaches 5.93 GHz obtained with thin thickness of 1.8 mm. The effective bandwidth reaches 15 GHz via regulating their thickness. The fabricated MnO2/ZnO composites can achieve great adaptability in microwave. MnO2/ZnO composites keep stability even heated 700 °C in air. The phase and weight remain unchanged. The proposed interfacial modulation strategy can provide new opportunities for the design of efficient electromagnetic absorber with thermal stability.

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Optical characterization of nanostructured MnO2ZnO thin films prepared from acetate-based sol−gel precursors

Cited by 6 publications

References 38 publications

Synthesis, Characterization and Photocatalytic Activities of Co₃O₄- MnO₂ - ZnO Ternary Nanoparticles

Synthesis, Characterization and Photocatalytic Activities of Co₃O₄- MnO₂ - ZnO Ternary Nanoparticles

Nickel Doped Zinc Oxide Thin Films for Visible Blind Ultraviolet Photodetection Applications

Superior Microwave Absorption Based on ZnO Capped MnO₂ Nanostructures

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Optical characterization of nanostructured MnO2ZnO thin films prepared from acetate-based sol−gel precursors

Cited by 6 publications

References 38 publications

Synthesis, Characterization and Photocatalytic Activities of Co3O4 - MnO2 - ZnO Ternary Nanoparticles

Synthesis, Characterization and Photocatalytic Activities of Co3O4 - MnO2 - ZnO Ternary Nanoparticles

Nickel Doped Zinc Oxide Thin Films for Visible Blind Ultraviolet Photodetection Applications

Superior Microwave Absorption Based on ZnO Capped MnO2 Nanostructures

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Synthesis, Characterization and Photocatalytic Activities of Co₃O₄- MnO₂ - ZnO Ternary Nanoparticles

Synthesis, Characterization and Photocatalytic Activities of Co₃O₄- MnO₂ - ZnO Ternary Nanoparticles

Superior Microwave Absorption Based on ZnO Capped MnO₂ Nanostructures