Nano

Recently, intelligent wearable flexible sensors for sports monitoring have received extensive attention. Here, we designed a AGO hydrogel-based triboelectric nanogenerator (A-TENG) for bio-mechanical harvesting and basketball posture monitoring. The AGO hydrogel can be rapidly prepared only by a simple mechanical mixing method, and there is no need to heat and add cross-linking agent during the preparation process. Besides, the A-TENG has good environmental adaptability, and the change of environmental humidity will not have irreversible impact on it. Furthermore, according to results, when the external resistance is 9M$\mathrm{\Omega }$, the output power density of A-TENG device reaches a maximum of 3.1W/m². The self-powered sensor based on A-TENG device can be used to monitor the basketball posture. In the future, the A-TENG device can have high application value in basketball training, in order to serve intelligent sports monitoring.

Ce${}_{1-x}$Pr${}_x$O₂ ($x=0$, 0.02, 0.04, 0.06, and 0.08) nano-materials synthesized using co-precipitation method have been investigated mainly for electronic structure properties in this manuscript. Findings and supporting studies are presented to understand the role of valence states of host and dopant cations information of F${}^{+}$ centers through X-ray photoelectron spectroscopy (XPS). Sustained cubic fluorite system confirmed by X-ray diffraction (XRD) analysis and red-shifting of energy gap by UV–Vis spectroscopy in all the samples are our findings. Samples further implored by XPS indicate incidence of cerium and Pr cations in both the oxidation states of 4$+$ and 3$+$, respectively. Finally, it has been observed that optical, electronic structure and magnetic properties of CeO₂ nanomaterials can be modified by Pr-doping, promising better yield samples with good amount of ferromagnetism for potential uses in the technological applications like spintronics, optoelectronics, and photocatalytic.

A novel photocatalyst comprising Fe-g-C₃N₄/FePc/BiVO₄ heterostructure was synthesized using hydrothermal and muffle incineration methods. The synthesized catalyst was subjected to characterization using SEM, XRD, EDX, XPS, photocurrent response, and EIS analysis. Results showed that the Fe-g-C₃N₄/FePc/BiVO₄ heterojunction composites significantly enhance the efficiency and stability of degradation of RhB. The unique advantages of the heterojunction composites include a wide range of light absorption and a small electron–hole complexation rate. Compared to pristine Fe-g-C₃N₄, FePc, and BiVO₄, the photocatalytic activity and stability were significantly improved. The formation of a new structure of Fe-g-C₃N₄ and FePc and BiVO₄ successfully adjusted the electron transfer route, resulting in more active sites and improving the efficiency of photogenerated charge separation. Furthermore, a possible mechanism for the photocatalytic degradation of RhB was proposed.

Magnetometry and atomic force microscopy (AFM) were used to study the magnetic and structural properties of the R–Fe–B-type (R = Y, Nd, Gd, Ho) alloys. The alloys were synthesized by means of induction melting. The nanocrystalline state of the R–Fe–B-type alloys was reached, mainly, by melt spinning (MS). A multistage treatment of R–Fe–B-type alloys, which included severe plastic deformation of melt-quenched ribbons and subsequent heat treatment, was also used. The surface morphology of samples was studied in detail to interpret the observed magnetic hysteresis loops of the samples. It was found that the type of rare earth ion and treatment methods had the most important influence on the microstructure and magnetic properties.

In this study, we fabricated a composite of polyethylene glycol (PEG) with molybdenum disulfide (MoS${}_2)$ using the laser ablation method for the first time, with different energy levels of 100, 300 and 500mJ. The structural, optical and thermal properties of the composite were investigated using various characterization techniques. The UV–Vis spectra showed a redshift in the absorption edge with the increase in laser energy. The FTIR spectra indicated the presence of functional groups in both PEG and MoS₂, and the characteristic peaks of both components were observed. The refractive index of the composite was found to decrease with an increase in laser energy. TEM images revealed the presence of rod-like and spherical particles with different sizes. The energy gap of the composite was also found to decrease with an increase in laser energy. The high absorption of the composite in the near-visible and visible regions allowed the photodiode to detect light with high sensitivity and accuracy. It is showing that the forward bias current of ($2\times 10^{-3}$Amp) is still relatively low and further optimization of the photodiode design and materials could lead to even higher current values and improved performance. These results suggest that the laser energy has a significant effect on the properties of the PEG–MoS₂ composite. The obtained results demonstrate that the PEG–MoS₂ composite has potential applications in various fields, including solar cells and drug delivery systems.

The structural, electronic, magnetic, and optical properties of Au, Cu, Cr, Mn, Co, Ni, and Fe atoms doped 13-atom silver clusters were investigated by the density functional theory (DFT) in the theoretical frame of the generalized gradient approximation (GGA) exchange-collection function. The results show that all the ground state structures of Au, Cu, Cr, Mn, Co, Ni, and Fe atoms doped 13-atom silver clusters are icosahedral, respectively. The Au atom doped on the surface of Ag${}_{13}$ cluster is stable, while other atoms doped in the center of Ag${}_{13}$ cluster are stable. The electronic stability order from high to small is Ag${}_{12}$Cr₁, Ag${}_{12}$Cu₁, Ag${}_{12}$Co₁, Ag${}_{12}$Fe₁, Ag${}_{12}$Au₁, Ag${}_{12}$Mn₁, Ag${}_{12}$Ni₁. Their magnetic moments are not only related to the doping atom but also the doping location of the atom. The magnetic moments of the Cu, Au, Mn, Co, Ni, Fe, and Cr atoms doped in the Ag${}_{13}$ cluster are 5.0, 3.0, 1.0, 3.0, 4.0, 2.0, and 0.0${\mu }_B$, respectively. Compared with the optical absorption spectrum of the Ag${}_{13}$ cluster, the Au, Cr, and Mn atoms doped the Ag${}_{13}$ cluster leading to blue shift, and the Cu, Co, Ni, and Fe atoms doped the Ag${}_{13}$ cluster resulting in red shift. These studies provide a theoretical basis on applications for clusters in electronic, magnetic, and optical devices.

Using the mixed solution of $n$-butanol and ethanol as solvent, the sodalite nanocrystal aggregate was prepared by the solvothermal method. The influences of crystallization temperature, molar ratio Na/Al, crystallization time and silane concentration on the morphology, crystallite size, degree of crystallization and pore structure of the as-prepared samples were investigated by X-ray diffraction (XRD), BET, FTIR, Transmission Electron Microscopy (TEM) and scanning electron microscope (SEM). The results reveal that the sodalite nanocrystals are aggregated by self-assembly into the micropore–mesopore–macropore structure. Higher crystallization temperature and longer crystallization time are conducive to the growth of sodalite nanocrystals. It is a necessary condition for the formation of sodalite nanocrystals to keep high molar ratio Na/Al. The higher the molar ratio Na/Al, the more favorable the crystallization of sodalite nanocrystals. The appropriate concentration of silane agent is conducive to the preparation of smaller crystal-sized sodalite nanocrystals. After removing the silane agent by pickling, the sodalite nanocrystal aggregate is a multistage porous structure with the pore volume of 1.0133mL/g and the specific surface area of 449.73m²/g.

Titanium dioxide nanotubes (TiO₂ NTs) exhibit superior biomechanical compatibility compared to artificial biomaterials. In this study, we employed density functional theory (DFT) calculations using the generalized gradient approximation (GGA) to determine the elastic-plastic regions and Young’s moduli of TiO₂ NTs. Following the optimization process, our findings reveal that the Ti-O bond lengths differ depending on whether they are inside or outside bonds, ranging from 1.85 to 2.05 angstrom. Notably, TiO₂ NTs demonstrate a low elastic modulus of approximately 29–38GPa when subjected to strains between −2% and 2% along the central axis of the nanotube. Regarding the elastic-plastic regions, the first critical point (${𝜀}_{c1})$ is reached at around 20% strain for the (8,8) TiO₂ NT, suggesting that it will transition out of the elastic region faster than the others under uniaxial strain. Additionally, the total density of state (DOS) analysis indicates that all of these structures exhibit semiconductor properties.

In this study, proanthocyanidins-functionalized Fe₃O₄ magnetic nanocomposites were synthesized by the hydrothermal method. The prepared Fe₃O₄ nanocomposites were characterized by Fourier transform infrared spectrometer (FTIR), X-ray powder diffractometer (XRD), physical property measurement system (PPMS), particle size analyzer, scanning electron microscope (SEM), and transmission electron microscope (TEM). FTIR results indicated that the obtained products were coated with proanthocyanidins. The SEM and TEM results, as well as particle size distribution analysis, revealed that the obtained products were spherical particles with average diameter of $328.62\pm 26.75$nm. XRD and PPMS characterization confirmed that the Fe₃O₄ nanoparticles have a cubic spinel structure with magnetic properties. The performance of the Fe₃O₄ nanocomposites for removing organic dyes in an aqueous solution was investigated. The synthesized products were found to be effective on removing various organic dyes, such as Methylene blue (MB), neutral red (NR) and Rhodamine B (RhB), indicating their considerable potential as efficient dyes adsorbents for wastewater treatment.