Long-Term Mechanical Reliability of Ceramic Thick-Film Circuits and Mechanical Sensors Under Static Load

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Semiconductor membranes are widely used in research fields that target medical, biological, environmental, and optical applications. Often such membranes derive their functionality from a nanopatterning, which challenges the determination of their optical, electronic, mechanical, and thermal properties. In this work, we demonstrate the noninvasive, all-optical thermal characterization of approximately-800-nm-thick and approximately-150-& micro;m-wide membranes that consist mainly of wurtzite GaN and a stack

Abnormal electrical breakdowns have been observed in the grid system of ion thrusters during both ground tests and space missions, leading to severe discharge-induced damage. Alumina ceramic, commonly used as an insulating material in grid systems, is subject to surface modification under ion beam irradiation, which in turn significantly alters its surface charging behavior. In this study, we systematically investigated the charging characteristics of alumina ceramics after Xe+ ion irradiation, including tr

Imparting electrical functionalities onto curved surfaces is an area of research which has been gaining momentum recently as such structures can provide multi-purpose parts enabling their use as cuff electrodes in tissue engineering for electrical stimulation and recording or as printed circuit AM parts for 3D antennas. Transfer printing using an advanced stamp design and a laser assisted metal deposition approach have previously been used for metallic deposition on curved substrates. However, both techniqu

Fracture processes in rock have widespread implications in the geohazard, geomorphologic, and civil and mining engineering communities. Propagation of fractures reduces overall rock mass strength, can lead to large-scale gravitational instabilities, and can cause significant hazard and damage to infrastructure. The potential for critical fracture in the form of rock falls and rock bursts are often the primary driver for scientific investigations, civil work project planning, and mining investment outlays. H

Soft, bioelectronics interfaces are broadly defined as microfabricated devices with mechanical properties suited to comply with biological tissues. There are many challenges associated with the development of such technology platforms. Simultaneously one must achieve reliable electronic performance, thermal and environmental stability, mechanical compliance, and biocompatibility. Materials and system architecture must be designed such that mechanical integrity and electrical functionality is preserved durin

This work describes the design, fabrication and laser trimming aspects of a low-cost compressive force sensor with analogue signal conditioning, designed for a medical syringe pump. First, the general design aspects are discussed, in view of facile and reliable batch production and measurement performance. Then, the circuit's trimming procedure is presented, featuring single- pass adjustment of sensor output in its final state, i.e. with all components mounted, without prior passive resistor trimming. Key w

Two-dimensional (2D) materials are a new type of materials under intense study because of their interesting physical properties and wide range of potential applications from nanoelectronics to sensing and photonics. Monolayers of semiconducting transition metal dichalcogenides MoS2 or WSe2 have been proposed as promising channel materials for field-effect transistors. Their high mechanical flexibility, stability, and quality coupled with potentially inexpensive production methods offer potential advantages

The resistivity dependence on temperature of composite resistors made of carbon fillers dispersed in an organic matrix are known to be strongly affected by the matrix thermal expansion. High positive temperature coefficient (PTC) effects, i.e. essentially switching from resistive to quasi-insulating behaviour, can be caused by phase changes in the matrix and the assorted volume expansion, a behaviour that has been previously shown with both simple organic waxes (low temperatures) and semicrystalline polymer

Glass fiber-reinforced polymer (GFRP) materials are increasingly used in building construction for the design of multifunctional structures. These composite materials allow the integration of structural functions, building physics functions (mainly thermal insulation) and architectural functions (complex forms and color) in single large-scale building components. GFRP materials also allow the fabrication of translucent structural components with high degree of transparency when optically aligned resins and

Inkjet-printing of solution-processable organic materials is a well-known fabrication method utilised to produce electronic devices on flexible substrates. It is especially suitable to realise, with a simple, digital layout design process, large-area devices with limited production costs [1]. Among the several different types of electronic devices already fabricated, a particularly important role is played by Organic Field Effect Transistors (OFETs) [2]. OFETs have been already proved to be capable to detec

Highly miniaturized low-power drop-coated metal-oxide gas sensors on polyimide foil are presented. Drop-coating of SnO2-based material was successfully achieved on transducers as small as 15 μm on polyimide, a substrate compatible with the printed electronics industry. The sensors showed a very good chemoresistive response when exposed to CO and NO2. The power consumptions of the sensors ranged from a minimum of 7.7 mW for the smallest hotplate at 200 °C to a maximum of 28.4 mW for the largest device at 250

This thesis presents an investigation of the models describing electrical conductivity in polymer nanocomposites, which consist in more or less random dispersions of nanometric conductive fillers like carbon nanotubes, nanofibers or graphene sheets in a po ...

Stress induced ferroelastic switching may represent an efficient toughening mechanism in piezoelectric-ferroelectric ceramics. During the crack propagation, the high tensional stresses at the crack tip can be partially released by the reorientation of 90 degree domains from along to perpendicular to the propagation direction. Compared to the phase transformation approach (inclusion of zirconia particles in the metastable tetragonal phase) this mechanism is not expected to reduce the piezoelectric properties

We propose an SMD (surface mount device) sensor in LTCC (low-temperature co-fired ceramic) technology specially designed for standard industrial compressed air. It combines the measurement of pressure, flow, and temperature, with its integrated signal conditioning electronics. Such a sensor can be mounted on an integrated electro-fluidic platform like a standard component using surface mount technology, obviating the need for both wires and tubes.

Structural stability issues in planar solid oxide fuel cells (SOFC) arise from the mismatch between the coefficients of thermal expansion (CTE) of the components. The stress state at operating temperature is the superposition of several contributions, which differ depending on the component. First, the cells undergo residual stresses due to the sintering phase during the manufacturing process. Furthermore, the load applied during the assembly of the stack to ensure the electric contact and flatten the cells

LTCC and thick-film technologies constitute excellent platforms for hermetic and controlled-atmosphere packaging, for applications in MEMS, space, micro/nanofabrication and biological fields. This work presents an active oxygen getter module, based on an integrated LTCC micro-hotplate coated with an oxygen-reactive metal in thick-film form. Gettering is activated by heating the platform, and getter consumption is monitored by the increase of its electrical resistance. Different reactive metals, ceramics or

This article presents experimental results of heat transfer from two different studies [1, 2] for horizontal flow boiling inside smooth copper tubes with different refrigerants. The main goal of this study was to verify the influence of the saturation temperature on the heat transfer coefficient. The experimental tests were carried for refrigerants R-134a, R-22 and R-404A, at saturation temperatures ranging from 5 to 20°C for two tubes of 12.7 and 13.84 mm ID and three heat fluxes of 5, 7.5 and 17.5 kW/m2.

Thick film deposition of conductive, dielectric and resistive pastes on ceramic membranes is a cost effective technique to manufacture piezoresistive pressure sensors. Thick-film resistors consist of a percolating network of conductive oxide nanoparticles dispersed in an insulating glassy matrix, the electrical properties of which depend on firing conditions and composition. Ceramic membranes are appropriate to withstand the firing temperatures of thick-film materials, which are about 850°C. However brittle

In this work, we have modified a low-temperature thick-film system previously developed for aluminium and aluminium alloy substrates in order to adapt it to ferritic and austenitic stainless steel, and glass substrates, which, unlike the common alumina substrate material, cannot usually be exposed to the standard high-temperature 850 °C thick-film firing cycle. Such substrate materials are useful for several important applications: high-response piezoresistive thick-film sensors (steel), displays (glass), h

The development of nanodevices demands for patterning methods in the nanoscale. To bring nanodevices to the market, there is a need for fast, low-cost nanopatterning methods. In addition, an increased flexibility is important for the engineering of multimaterial and multifunctional nano/micro-electro-mechanical systems (NEMS/MEMS), such as polymer-based electronic and sensor devices, 3D microfluidic systems, and bio-analytical systems. A series of alternative surface micro/nanopatterning methods based on ME

Long-Term Mechanical Reliability of Ceramic Thick-Film Circuits and Mechanical Sensors Under Static Load

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Thermal analysis of GaN-based photonic membranes for optoelectronics

Investigation of surface charging characteristics of ion-irradiated alumina ceramics: Transition from secondary electron emission to charge injection

Resist-free metal patterning inside 3D printed concave tubular structures using a flexible stencil

Thermal influences on macroscale rock damage

Implementing MEMS technology for soft, (bio)electronics interfaces.

Manufacturing and trimming of a low-cost industrial thick-film force sensor

Light Generation and Harvesting in a van der Waals Heterostructure

Tuneable PTC effect in polymer-wax-carbon composite resistors

Total Light Transmittance of Glass Fiber-Reinforced Polymer Laminates for Multifunctional Load-Bearing Structures

Functionalisation of inkjet-printed Organic Field Effect Transistors with odorant binding proteins for the detection of gaseous analytes

Drop-coated metal-oxide gas sensor on polyimide foil with reduced power consumption for wireless applications

On the insulator-conductor transition in polymer nanocomposites

PFM investigation of stress induced ferroelastic switching in piezoelectric bulk ceramics

SMD pressure and flow sensor for compressed air in LTCC technology with integrated electronics

Simulation of Thermal stresses in anode-supported solid oxide fuel cell stacks

LTCC active oxygen getter module for hermetic packaging applications

INFLUENCE OF THE SATURATION TEMPERATURE ON THE HEAT TRANSFER COEFFICIENT FOR FLOW BOILING INSIDE HORIZONTAL SMOOTH TUBES

Development of pressure sensors by powder technology

Integrated thick-film hybrid microelectronics applied on different material substrates

Emerging nanopatterning methods based on MEMS tools