Influence Of Substrate Material Research Articles

Design optimization for enhancing performances of integrated planar inductor for power electronics applications

Goal. In this work, the performance of an integrated planar inductor with a square geometric shape using different materials for the substrate: Ni-Fe, Mn-Zn and Ni-Zn have been analyzed and investigated in order to assess the impact of the substrate material on the performance of the integrated planar inductor and to determine the optimal material in the various applications of power modules in power electronics. Methods. To this end, we carried out an in-depth analysis of the geometric dimensions of the integrated planar inductor, by calculating all the geometric parameters of the proposed structure, to establish an equivalent physical model of the integrated planar inductor in order to evaluate its different electrical specifications. The numerical simulation, based on the three-dimensional mathematical model of the system using Maxwell’s equations, was realized by COMSOL Multiphysics software. Results show the importance of the substrate material for the performance of the integrated planar inductor, and specify that the use of Ni-Fe ferrite as a substrate of the integrated planar inductor gives very interesting performance compared to other materials studied. The presented results provide valuable information on the influence of substrate material on the performance of embedded integrated planar inductor and can help to design and optimize these components for use in power electronic systems. Practical value. These results are significant for a wide range of applications, where the integrated planar inductor performance and efficiency can have a significant impact on the overall performance and cost-effectiveness of the power electronic device. References 37, tables 2, figures 7.

Influence of Substrate Material and Sensor Geometry Variations on the Performance of Fused Deposition Modeling-Printed Strain Sensors

Influence of Substrate Material and Sensor Geometry Variations on the Performance of Fused Deposition Modeling-Printed Strain Sensors

Linearity and Sensitivity Analysis of MEMS Thermal Wind Sensor via Analytical Model

In this article, an analytical model focusing on the linearity and sensitivity of micro-electromechanical systems (MEMS) thermal wind sensors with low thermal conductivity substrate (LTCS) and packaging is proposed. The influence of substrate material, substrate thickness, heater size, measurement distance, packaging material, and packaging size on the sensor performances are investigated to serve as design guidelines for future thermal wind sensors. For the first time, model results reveal that all the factors listed above have opposite effects on the sensitivity and linearity of the wind sensors. Furthermore, sensitivity and linearity are related to power consumption and measurement range respectively. Therefore, a compromise between sensitivity and linearity is required for high wind speed measurement applications. The real wind sensor fabricated with ceramic substrate and encapsulated by a plastic carrier was tested in a wind tunnel. The experimental results illustrated that the sensitivity of the sensor at 3.3 m/s is 157 mV/( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{W}\cdot \text{m}\cdot \text{s}^{-1}$ </tex-math></inline-formula> ). In addition, the fitting linearity parameter <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$B_{m}$ </tex-math></inline-formula> is 0.424 in the range from 0 to 33 m/s.

Influence of substrate material and geometric features of measurement slits on the measurement results of infrared optical system quality characteristics

Influence of substrate material and geometric features of measurement slits on the measurement results of infrared optical system quality characteristics

Substrate influence on low energy electron beam processing of YBa2Cu3O7−δ thin films

The influence of substrate material on electron writing (EW) procedures directed at fabrication of artificial channels for easy vortex motion in YBa2Cu3O7−δ (YBCO) epitaxial thin films has been investigated. Films deposited on two types of substrates providing epitaxial growth, magnesium oxide (MgO) and La0.18Sr0.82Al0.59Ta0.41O3 (LSAT) substrates, have been irradiated in a standard electron transmission microscope with low and high fluency 30 keV electrons. The effects of irradiation have been assessed by the measurements of the superconducting transition temperature and the critical current, completed by the micro-Raman spectroscopy and transmission electron microscopy structural investigations. The irradiation effects were found to depend on the type of substrate on which films were deposited. Differences have been attributed to distinct structural properties of the films, resulting from different matching of substrates lattices to the YBCO crystalline lattice. A stronger mismatch of MgO substrates causes the formation of in-plane disoriented epitaxial grains and significant heat confinement during EW procedures. Heat confinement mechanism, together with differences in the thermal properties of the substrates enables understanding the performance of different YBCO films in electron writing procedures.

An economic and concise method to solve nozzle clogging issue during electro hydrodynamic printing

Electro hydrodynamic (EHD) printing is a promising technique for alternative fabrication of high resolution micro- and nano-structures without employment of any molds or photo-masks. However, a major problem, nozzle clogging, often occurs when the viscosity of the inks or the size of ink particles is raised. We proposed in this work an economic and concise method to solve the nozzle clogging issue. A PDMS-glass disassembled nozzle was designed and fabricated, which can be bonded under pressure and separated after pressure release. The influence of substrate material, bonding pressure, aspect ratio and channel-size on the dimension loss of PDMS micro-channel was investigated by an established simulation method. It is expected that the proposed method has great potential for fabrication of reusable nozzle without the clogging problem.

Features of vanadium dioxide films deposition by reactive magnetron sputtering

In this work, influence of substrate material and technological process parameters on the stoichiometric composition, crystal structure and phase transition character in vanadium oxide films deposited by the magnetron sputtering method is investigated.

Influence of Substrate Material on the Sensitivity of the Raman Lidar Technique for Detecting Traces of High-Energy Materials

Experimental results on the remote detection of surface traces of some high-energy materials are presented. The detection was performed with the use of a Raman lidar based on a narrow-linewidth excimer KrF laser and a multichannel spectrum analyzer with diffraction spectrograph and time-gated ICCD camera. The sensitivity of the lidar system is estimated for a detection range of 10 m. The influence of a substrate material on the detection sensitivity is analyzed.

Essential Factors Influencing the Bonding Strength of Cold-Sprayed Aluminum Coatings on Ceramic Substrates

The present work summarizes the most important results of a research project dealing with the comprehensive investigation of the bonding mechanisms between cold-sprayed Al coatings and various poly- and monocrystalline ceramic substrates (Al2O3, AlN, Si3N4, SiC, MgF2). Due to their exceptional combination of properties, metallized ceramics are gaining more and more importance for a wide variety of applications, especially in electronic engineering. Cold spray provides a quick, flexible, and cost-effective one-step process to apply metallic coatings on ceramic surfaces. However, since most of the existing cold-spray-related publications focus on metallic substrates, only very little is known about the bonding mechanisms acting between cold-sprayed metals and ceramic substrates. In this paper, the essential factors influencing the bonding strength in such composites are identified. Besides mechanical tensile strength testing, a thorough analysis of the coatings and especially the metal/ceramic interfaces was conducted by means of HRTEM, FFT, STEM, EDX, EELS, GAXRD, and EBSD. The influence of substrate material, substrate temperature, and particle size is evaluated. The results suggest that, apart from mechanical interlocking, the adhesion of cold-sprayed metallic coatings on ceramics is based on a complex interplay of different mechanisms such as quasiadiabatic shearing, static recrystallization, and heteroepitaxial growth.

Influence of substrate material on spectral properties and thermal quenching of photoluminescence of silicon vacancy colour centres in diamond thin films

Abstract Nanocrystalline diamond films with bright photoluminescence of silicon-vacancy colour centres have been grown using a microwave plasma enhanced CVD technique. The influence of substrate material (quartz, Al2O3, Mo and Si) on a reproducible fabrication of diamond thin films with Si-V optical centres is presented. Film quality and morphology are characterized by Raman spectroscopy and SEM technique. SEM shows well faceted diamond grains with sizes from 170 to 300 nm. The diamond peak is confirmed in Raman spectra for all samples. In the case of the quartz substrate, a redshift of the diamond peak is observed (≈3.5 cm−1) due to tension in the diamond film. The steady-state photoluminescence intensity was measured in the temperature range from 11 K to 300 K. All spectra consist of a broad emission band with a maximum near 600 nm and of a sharp zero phonon line in the vicinity of 738 nm corresponding to Si-V centres that is accompanied with a phonon sideband peaking at 757 nm. Activation energies for the thermal quenching of Si-V centre photoluminescence were determined and the effect of the substrate on photoluminescence properties is discussed too.

Influence of substrate material and its plasma pretreatment on adhesion and properties of WC/a-C:H nanocomposite coatings deposited at low temperature

WC/a-C:H tribological nanocomposite coatings were deposited by reactive magnetron sputtering of tungsten carbide targets in acetylene atmosphere on substrates of various materials – cemented carbide and three types of steel. All the substrates were pretreated by various magnetron plasma-based techniques to evaluate their efficiency in promotion of coating adhesion. All the studied processes took place at temperatures lower than 180°C. The structure of the WC/a-C:H coatings and their mechanical properties did not depend on the pretreatment technique nor the type of substrate material. On the other hand, the surface roughness of the substrate and the deposited coating can be affected by the intensity and duration of the pretreatment process. The adhesion of the coatings is significantly dependent on the substrate material and the particular plasma pretreatment process, as well as their combination. HiPIMS pretreatment processes with lower duty cycle at higher substrate bias voltage result in excellent adhesion with scratch critical load values higher than 130N. Further, the substrate-target distance influences the efficiency of the pretreatment process and also partly affects the performance of the coatings. It is concluded that magnetron plasma-based pretreatment and deposition processes might involve potential practical problems in industrial coating of various objects in the same process batch. This is particularly connected with their shape and their composition.

The influence of substrate material on the resistance of composite films based on reduced graphene oxide and polystyrene

The influence of substrate material on the resistance of composite films based on reduced graphene oxide and polystyrene

Influence of Substrate Material on Structure Formation and Optical Properties of CdS Thin Films by Chemical Spray Pyrolysis

Influence of Substrate Material on Structure Formation and Optical Properties of CdS Thin Films by Chemical Spray Pyrolysis

Calibration and parameter variation using a finite element model for death time estimation: The influence of the substrate.

The most established method for temperature based death time estimation is based on an empirical double exponential model. New physically based approaches using numerical simulation techniques are subject of current research. A major advantage of such models is the possibility to incorporate non-standard boundary conditions. The aim of this study was to investigate the influence of the substrate on the cooling rate of a body in the early postmortem phase. A finite element model was used for parameter variation in terms of different substrate materials. Simulation results showed a considerable influence of substrate material on the postmortem cooling rate of a body. From a thermodynamical point of view, comparability between measurements on a steel trolley and real cooling scenarios with common substrates like normal floors, asphalt or soil remains questionable. It could be shown that not only the type of substrate but also its composition can have a considerable influence on the postmortem body cooling rate.

Single Nanotube Voltammetry: Current Fluctuations Are Due to Physical Motion of the Nanotube.

Nanoimpacts of single palladium-coated carbon nanotubes on a gold substrate are studied to elucidate the origins of the fluctuation in the current–time response of the hydrogen oxidation reaction mediated at its surface. The chronoamperometric and cyclic voltammetric responses from a single nanotube immobilized on the gold surface were compared to analogous data on a carbon substrate to determine the possible influence of substrate material on the nanotube–electrode electrical contact. No significant distinction between the gold and carbon was found, indicating in light of the considerable differences in the substrate materials’ intrinsic electronic structures that it is the nanomotion of a nanotube at the electrode surface which is likely responsible for the observed current modulation. This nanomotion creates a varying contact resistance, to which the noise in the current–time signal of the mediated reaction is attributed. In addition, stochastic ex-situ adsorption of single nanotubes onto the gold electrode followed by careful drying of the electrode surface was found to drastically reduce the current fluctuation, again implying that a contact resistance arising from physical motion of the nanotube at the electrode is responsible for the modulation of current.

Resputtering Effect on Nanocrystalline Ni-Ti Alloy Films

We report on the effect of resputtering on the properties of nanocrystalline Ni-Ti alloy thin films deposited using co-sputtering of Ni and Ti targets. In order to facilitate the formation of nanocrystalline phases, films were deposited at room temperature and 573 K (300 °C) with substrate bias voltage of −100 V. The influence of substrate material on the composition, surface topography microstructure, and phase formations of nanocrystalline Ni-Ti thin films was also systematically investigated. The preferential resputtering of Ti adatoms was lesser for Ni-Ti films deposited on quartz substrate owing to high surface roughness of 4.87 nm compared to roughness value of 1.27 nm for Si(100) substrate.

The influence of substrate material on the micromechanical properties of hydroxyapatite coatings

The influence of substrate material on the micromechanical properties of hydroxyapatite coatings

Influence of substrate material on the microstructure and optical properties of hot wall deposited SnS thin films

Tin monosulfide SnS raises an interest as a promising material for photovoltaics. The influence of the substrate material on the microstructure and optical properties of SnS thin films with [111] texture obtained by hot wall vacuum deposition on glass, molybdenum and indium tin oxide substrates is reported. The lattice parameters for layers grown on different substrates were determined by X-ray diffraction and their deviations from the data reported in the literature for single α-SnS crystals were discussed. The change in the degree of preferred orientation of the films depending on the substrate material is observed. The direct nature of the optical transitions with the optical band gap of 1.15±0.01eV is reported.

Influence of Substrate Material on Radiation Characteristics of THz Photoconductive Emitters

We present in this paper spectral and spatial characteristics of terahertz emission from standard dipole antenna structures used as emitters depending on the substrate material. All antenna structures were lithographically fabricated on low-temperature (LT) grown, few-micrometers-thick gallium arsenide (GaAs) layers. To investigate the effect of the substrate material on the radiation pattern of terahertz beams, either semi-insulating gallium arsenide or high-resistivity silicon substrate wafers have been used. As detector a standard 40 µm long dipole antenna on a semi-insulating GaAs substrate with a low-temperature grown gallium arsenide layer on it has been employed; this configuration allows for broadband detection and is still efficient enough for the characterization purpose. Strong dependence of the radiation pattern on the substrate used for the terahertz source is demonstrated. The measured patterns and differences between the two cases of substrates are well explained by means of classical diffraction.

The effect of electroplating parameters and substrate material on tin whisker formation

Electroplated tin finishes are widely used in the electronics industry due to their excellent solderability, electrical conductivity and corrosion resistance. However, the spontaneous growth of tin whiskers during service can result in localised electrical shorting or other harmful effects. Until recently, the growth of tin whiskers was successfully mitigated by alloying the tin with lead. However, restriction in the use of lead in electronics as a result of EU legislation (RoHS) has led to renewed interest in finding a successful alternative mitigation strategy.Whisker formation has been investigated for a bright tin electrodeposit to determine whether whisker growth can, at least partially, be mitigated by control of electroplating parameters such as deposition current density and deposit thickness. The influence of substrate material and storage at 55°C/85% humidity on whisker growth have also been investigated.Whisker growth studies indicate that deposition parameters have a significant effect on both whisker density and whisker morphology. As deposition current density is increased there is a reduction in whisker density and a transition towards the formation of large eruptions rather than potentially more harmful filament whiskers. Increasing the tin coating thickness also results in a reduction in whisker density. Results demonstrate that whisker growth is most prolific from tin deposits on brass, whilst that from tin deposits on rolled silver is greater than that observed for tin deposits on copper.