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The porous-spherical MnO2-Mn(OH)2/Ppy (polypyrrole) nanocomposite is synthesized through a one-pot, cost-effective oxidative polymerization method using KMnO4. This synthesis technique demonstrates great promise in terms of its ability to achieve mass production of the nanocomposite. The nanocomposite has a great optical property related to its wide optical absorbance from UV to near IR region (250 till 730 nm). The electrical properties of the MnO2-Mn(OH)2/Ppy nanocomposite photodetector were systematically tested under various optical conditions. Through these measurements, the performance of the photodetector was evaluated and characterized. The current density (Jph) is used to estimate the sensitivity of the generated electrons under the photon's irradiation. Under off/on light, the produced Jph are 4.2 and 9.5 mA cm−2, correspondingly. While, as the wavelengths increase from 340 to 730 nm, the Jph values exhibit a decrease, declining from 0.34 to 0.28 mA/cm². This trend illustrates the nanocomposite excellent responsiveness to photons across a wide range of optical regions. The promising sensitivity related to the photoresponsivity (R) of of 3.42 mA W−1. These values are estimated through detectivity (D) calculation, in which the D value is 6.42*108 Jones. With its exceptional reproducibility, the developed photodetector demonstrates strong suitability for industrial applications. Additionally, its synthesis process incurs low costs, further enhancing its attractiveness for practical implementation in various industries. [ABSTRACT FROM AUTHOR]

A highly uniform spherical MoO2-MoO3/polypyrrole core-shell nanocomposite has been successfully synthesized as an optoelectronic photon sensing material, capable of detecting light in the UV, Vis, and IR domains. The nanocomposite is prepared through the oxidation of pyrrole using Na2MoO4, resulting in a uniform spherical morphology that has been confirmed by TEM, theoretical modeling, and SEM analyses. This morphology contributes to its promising optical behavior, characterized by a small bandgap of 1.36 eV. The optoelectronic photosensing capability of the nanocomposite has been evaluated across the UV, Vis, and IR spectra, demonstrating high efficiency. The photoresponsivity R values indicate the ability of the nanocomposite to generate hot electrons in response to incident photons. With an R value of 4.15 mA·W−1 at 440 nm, this optoelectronic device exhibits considerable promise for integration into an advanced technological apparatus. The detection (D) value of 9.30 × 108 Jones at 440 nm further confirms the high sensitivity in the Vis region. The excellent stability of the device can be attributed to the inherent MoO2-MoO3 oxide and Ppy polymer materials. This stability has been demonstrated through reproducibility studies and current-voltage measurements under various optical conditions. The combination of stability, efficiency, and sensitivity makes this optoelectronic device well suited for light sensing applications in both industrial and commercial settings. Its promising performance opens up opportunities for advancements in various fields requiring accurate and reliable light detection. [ABSTRACT FROM AUTHOR]

This study utilized the exceptional optical and electrical properties of polypyrrole (Ppy) to fabricate high-performance optoelectronic devices. The synthesis of the porous-spherical Cr2O3-Cr(OH)3-Ppy/Ppy nanocomposite thin film was achieved by preparing a second thin film of Cr2O3-Cr(OH)3-Ppy on the initial Ppy film using K2Cr2O7 as an oxidant. The nanocomposite's properties were thoroughly characterized, including XRD and optical absorbance analyses. The XRD analysis showed that the crystalline size of the nanocomposite was 20 nm, while optical absorbance analysis demonstrated that the nanocomposite had a higher absorbance in a wide optical range compared to Ppy nanomaterials, as evidenced by the enhancement in bandgap (Eg) value from 3.33 eV for Ppy to 1.89 eV for Cr2O3-Cr(OH)3-Ppy. The fabricated nanocomposite thin film exhibited excellent light-sensing behavior, as evidenced by the evaluation of Jph values under different light conditions and various monochromatic lights with a detectivity (D) of 3.6 × 106 Jones (at 340 nm). The device demonstrated its potential as a solar cell, with a short circuit current (JSC) of 13 µA and an open circuit voltage (VOC) of 1.91 V. Given the nanocomposite's low cost, high technical production, and superior optoelectronic properties, it has significant potential for use in commercially available high-tech devices. [ABSTRACT FROM AUTHOR]

Magnetite nanoparticle/multi-walled carbon nanotube composites (Fe 3 O 4 /MWCNTs) were prepared using femtosecond pulsed laser ablation of iron target immersed in functionalized MWCNTs by facile one-pot synthesis of pulsed laser ablation in liquid environmental for catalytic degradation of 4-ntrophenol from aqueous solution. The easily obtained magnetic nanocomposites were systematically characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Raman spectroscopy, and Fourier transform infrared spectroscopy (FT-IR). According to XRD, magnetite is the magnetic phase that has formed. A network of MWCNTs is seen in the FESEM image, together with nano‑iron oxides. Raman spectroscopy revealed that the reduction of the sp2 bond domains due to the strong contacts between iron oxide and MWCNT increased the D/G ratio, which may lead to structural distortions in the nanotubes. From FT-IR, the presence of new peaks in the finger print region related to Fe-O-Fe in Fe 3 O 4 , indicates that Fe3O4 has been successfully loaded onto the surface of MWCNTs. In addition, the prepared magnetic nanocomposite showed outstanding catalytic reduction activity for 4-NP when compared to MWCNTs and Fe 3 O 4. The results demonstrated that the prepared nanocomposite could be a promising nanocatalyst for the catalytic reduction of 4-NP. The straightforward, speedy, and dependable Fe 3 O 4 /MWCNTs-based approach was found to be a possibly relevant technology for the targeted removal of pollutants and the treatment of wastewater. [Display omitted] [ABSTRACT FROM AUTHOR]