Interaction of the first few deposited atomic layers with the substrate plays an important role in the growth and morphology of very thin films of metals and semiconductors. Self-assembled monolayers (SAMs) of organic molecules have a wide range of applications, from molecular electronics to immobilization of biomolecules. SAMs of organic molecules can be used to control the morphology, electrical, magnetic, and optical properties of overgrown metals and semiconductors. Here we report the thickness-dependent variation in the morphology and the optical properties of ZnO deposited by RF sputtering on the SAM of 1-octadecanethiol (ODT) and 16-mercaptohexadecanoic acid (MHA) grown on Au/Si. Morphology of ZnO thin films deposited on the SAM strongly depended on the organic functional group of the SAM. Uniformly distributed clusters, like the formation of ZnO, were observed when deposited on ODT, whereas a uniform thin film of ZnO was grown when deposited on MHA SAM. Band gap of deposited thin films depends on the thickness and morphology of the deposited ZnO.

Two different strategies for the calculation of the eddy-current transient response based on the solution of the Helmholtz equation in the complex frequency plane are compared in terms of their numerical performance. The use of the complex frequency spectrum approach proves to be better suited for the solution of problems with high dissipation than the Fourier transform method. This comes however at the price that the domain of the inverse operator exceeds the whole complex plane, which makes its numerical evaluation less trivial than in the case of the Fourier transform. It will be shown that the choice of the optimal inversion algorithm is problem-dependent.

This study presents a simple, efficient, low-cost and catalyst-free strategy for depositing fluorescent zinc oxide (ZnO) thin films on quartz substrates using radio frequency (RF) atmospheric pressure (AP) plasma enhanced chemical vapor deposition (PECVD). Diethylzinc (DEZ) and carbon dioxide (CO2) were employed as the precursor and oxidant, respectively. The plasma discharge characteristics, optical emission spectra (OES), and film growth mechanisms were systematically investigated. ZnO films exhibited high visible-light transmittance (>85%) and strong cyan fluorescence under UV irradiation, attributed to surface defects confirmed by photoluminescence (PL) spectra. X-ray photoelectron spectroscopy (XPS) revealed Zn2+ as the dominant chemical state, while amorphous structures were identified via X-ray diffraction (XRD) and Raman spectroscopy. A key innovation lies in the atmospheric pressure plasma process, which eliminates the need for high-temperature annealing or vacuum systems, significantly reducing production time and cost compared to conventional methods. Additionally, the influence of CO2 flow rate on film morphology and optical properties was elucidated, demonstrating tunable fluorescence for potential optoelectronic applications.

The use of magnetic fields allows to modify the trajectory of magnetizable particles in a fluid. If a ring magnet is centered on the cylinder containing the fluid, it enhances the dynamics of a falling ball, and an equilibrium position is found. To compute the particle dynamics, the magnetic force should be found accurately: a method based on virtual works allows to obtain the force as well as the stiffness matrix, to gain accuracy. The computed trajectories are compared to the experimental ones for Newtonian fluids at first, and extended to viscoplastic fluids.

This study delves into the electronic, structural, magnetic, and ferromagnetic properties of RbZnF 3 perovskite. We explored both the pure state and configurations doped with V, Cr, Mn, Ni , and Cu atoms at a concentration of 5% in the Zn position. To achieve this, we perform KKR-CPA combined with GGA. The ferromagnetic stability of RbZn 0.95 Cr 0.05 F 3 and RbZn 0.95 Cu 0.05 F 3 is observed, where (Cr, and Cu)-3d is set on the spin-down of E F connected to the half metallicity. In the case of RbZn 0.95 TM 0.05 F 3 alloy, the TM-3d states show a variation in the exchange splitting ( t 2g + , t 2g − ). The configuration that is predicted by the charge state is closer to the V 2+ configuration, in which 3 electrons occupy t 2g + . In the examination of the RbZn 0.95 Mn 0.05 F 3 alloy, we discover that an indirect coupling is indicated by the hybridization of the Mn-3d and F-2p orbitals between −0.22 and −0.08 Ry.

The citrate sol-gel process was used to produce Sr2FeO4 strontium ferrite powder. The method involves metallic nitrates, citric acid and distilled water as a solvent, followed by calcination. The Ruddlesden-Popper structure of the resulting compound was identified by XRD analysis. The different molecular structures and vibration bands were studied by FTIR. The morphology of the powder was analysed using SEM. Samples appear of good crystalline quality and with interesting nanostructure. We studied optical properties and determined the band gap energy to lie about 2.8 eV, Sr2FeO4 can thus absorb photons having a wavelength less than 444 nm, approximately, making this compound potentially interesting for applications.

The angular distribution of sputtered particles is an effective tool for obtaining information on the composition and structure of the target and even on the beam energies. The particles of Inconel718 super alloy sputtered at full angle corresponding to each of the probes were calculated. The SRIM program associated with a new ANGULARE simulation program was used to obtain the sputtering yields and angular distribution of sputtered Fe, Al, Cr, Mo, Nb, Ni and Ti particles from Inconel718. The simulation was performed for a large number of incident ions (5 keV, Kr+) and allows the computer to count the number of particles emitted at the solid angle. Angular distributions of pulverized Inconel718 particles and pulverized yields were compared to the literature. Furthermore, the angular distribution of Inconel718 for the differential sputtering yields shows an under-cosine tendency.

In this work, KZnPO4:Dy3+and KZnPO4:Sm3+phosphors are synthesized using the Combustion technique. The phosphor XRD and photoluminescence properties were studied. The XRD was used to confirm the orthorhombic phase with the space group P n a 21. The PL emission spectra of the synthesized KZnPO4:Dy3+phosphor shows a strong emission at 482 and 574 nm under 350 nm excitation, which is ascribed due to4F9/2→6H15/2and4F9/2→6H13/2electronic transitions of the Dy3+ions, respectively. When the KZnPO4:Sm3+phosphor was excited at 402 nm, the emission spectra exhibited prominent bands located at 562 and 597 nm. The CIE coordinates show that the current phosphors have high colour purity. The KZnPO4:Dy3+and Sm3+phosphors provide an excellent candidate for n-UV-based w-LEDs.

Acoustophoresis separation technique has attracted great attention due to its superior properties, such as biocompatibility, non-contact, label-free and high-efficiency. In this paper, separation of particles based on motion modes via tilt angle standing surface acoustic wave (TaSSAW) driven by a unidirectional transducer is developed theoretically. It is verified that the designed electrode width controlled unidirectional transducers are effective to improve the intensity of the acoustic field and the acoustic radiation force of the particles in the channel. The results show that when the density and compressibility of the particles are close to those of the fluid and the particle shape is close to spherical, the influences of fluid viscosity and particle shape on the acoustic radiation force are negligible. It is found that in the TaSSAW system the motion modes of the particles are divided into locked mode and drift mode, and they depend on the fluid velocity, acoustic field intensity and tilt angle. polystyrene (PS) particles with radii of 4 and 5 µm are separated based on the differences of motion modes. For further smaller size difference (4.5 and 5 µm) particles, the separation is also realized successfully by making particles move in the same drift mode.