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Glancing Angle Deposition (GLAD) technique has been used to fabricate the Ag nanoparticles (NPs) over TiO₂ thin film (TF) on the n-Si substrate. The deposited Ag NPs are in the size of 3-5 nm. Open-air annealing has been done at 500 °C and 600 °C for the n-Si/TiO₂ TF/Ag NP samples. High Resolution X-ray Diffraction (HRXRD) peaks were identified to calculate the crystalline size of the NPs and rutile phase of the annealed sample were exhibited. Morphological analysis has been done for the sample using Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS) and Atomic Force Microscopy (AFM). The enhancement of plasmonic absorption and modulation in the bandgap for the annealed Ag NPs surrounded TiO₂ TF has been verified by UV-Vis Spectroscopy and the bandgap has been calculated using Tauc plot. An overall 2.5 fold and 3 fold enhancement has been observed in the UV region and visible region for n-Si/TiO₂ TF/Ag NP annealed at 500 °C and 600 °C samples as compared to the n-Si/TiO₂ TF/Ag NP as-deposited samples. The modulation of bandgap due to the sub-band transition and Localized Surface Plasmon Resonance (LSPR) effect of Ag NPs and relevant sub-band transition due to change in annealing temperature has been reported.Indium tin oxide (ITO) nanoparticles were coupled with NaYF4(Gd, Si) using a TiO₂-solution impregnation method. Scanning electron microscopy confirmed that TiO₂ and ITO nanoparticles were loaded on the surface of the NaYF4(Gd, Si) upconversion phosphor. The ultraviolet/visible spectra of the 20 wt.% ITO-NaYF4(Gd, Si)/TiO₂ composites were extended at the absorption edges towards the UV-visible region. The 20 wt.% ITO-coupled NaYF4(Gd, Si)/TiO₂ composites exhibited superior photocatalytic efficiency compared to only NaYF4(Gd, Si)/TiO₂ under near-infrared (NIR) irradiation. Multi-wavelength NIR photons of γ > 760 nm from a Xe solar simulator source induced photo-activation through the NaYF4(Gd, Si) activator centers. The three-cycle photocatalytic reusability performance of the 20 wt.% ITO-impregnated NaYF4(Gd, Si)/TiO₂ composite was positively enhanced by up to 20% more than that of NaYF4(Gd, Si)/TiO₂.The emergence of bacterial resistance to currently available antibiotics emphasized the urgent need for new antibacterial agents. Nanotechnology-based approaches are substantially contributing to the development of effective and better-formulated antibiotics. Here, we report the synthesis of stable manganese oxide nanostructures (MnO NS) by a facile, one-step, microwave-assisted method. Asprepared MnO NS were thoroughly characterized by atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), dynamic light scattering (DLS), UV-Visible spectroscopy and X-ray powder diffraction (XRD). UV-Visible spectra give a sharp absorption peak at a maximum wavelength of 430 nm showed surface plasmon resonance (SPR). X-ray diffraction (XRD) profile demonstrated pure phase and crystalline nature of nanostructures. Morphological investigations by a scanning electron microscope showed good dispersity with spherical particles possessing a size range between 10-100 nm. Atomic force microscope data exhibited that the average size of MnO NS can be controlled between 25 nm to 150 nm by a three-fold increment in the amount of stabilizer (o-phenylenediamine). Antimicrobial activity of MnO NS on both gram-positive (Bacillus subtilis) and gram-negative (Escherichia coli) bacterial strains showed that prepared nanostructures were effective against microorganisms. Further, this antibacterial activity was found to be dependent on nanoparticles (NPs) size and bacterial species. These were more effective against Bacillus subtilis (B. subtilis) as compared to Escherichia coli (E. coli). Considering the results together, this study paves the way for the formulation of similar nanostructures as effective antibiotics to kill other pathogens by a more biocompatible platform. This is the first report to synthesize the MnO NS by green approach and its antibacterial application.A novel nanocomposite of N-Doped Carbon Quantum Dots@Carbon Nanotubes was synthesized in this study for electrochemical detection of bisphenol A by differential pulse voltammetry. The nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction and Fourier transform infrared spectroscopy. Electrochemical properties of the nanocomposite modified glassy carbon electrodes were studied via cyclic voltammetry. Differential pulse voltammetry experimental results showed that N-Doped Carbon Quantum Dots@Carbon Nanotubes/glassy carbon electrode exhibited excellent catalysis activity towards electrochemical oxidation of bisphenol A. find more The oxidation peak current was linearly increased with concentration of bisphenol A in the range from 0.4 μM to 40 μM, with a limit of detection of 65 nM.Magnetic magnesium ferrite nanoparticles were fabricated via the ethanol-assisted solution combustion and gel calcination route. The scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectrometer, Brunauer-Emmett-Teller (BET) surface area measurement, vibrating sample magnetometer (VSM) and X-ray diffraction (XRD) were applied to characterize magnetic magnesium ferrite nanoparticles which were prepared under the condition of 20 mL absolute alcohol and calcined at 600 °C for two hours. The results showed that the nanoparticles were spinel structure with the saturation magnetization of 183 emu·g-1, the average grain size of 52 nm, the specific surface area of 33.2 m² · g-1. In addition, the electrochemical property and adsorption mechanism of neutral red (NR) onto the magnetic MgFe₂O₄ nanoparticles were investigated. The adsorption results were conformed to the pseudo-second-order adsorption kinetic and Temkin model, which implied that the multimolecular layer chemical adsorption had occurred. Moreover, the pH had little effect on the process of the adsorption, and the value of the magnetic magnesium ferrite nanoparticles for NR adsorption was up to 555 mg · g-1.