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Electronic sensors and controlling devices widely use specific materials, in which electrical resistance can be changed many times under the influence of external factors: temperature, pressure, electrical field, moisture and even smell. In the report, a principal mechanism is examined: how electrical polarization can affect the conductivity in different crystals. Understanding of physical nature...
This paper focuses on an ultra-sensitive H2 sensor fabricated using a time and cost-effective method. The sensor is comprised of Pd nanowires fabricated using λ-DNA templates. The morphology and the electrical characterisation of the metalized DNA nanowires (diameter = 5–45nm) were investigated by AFM and conductive AFM (cAFM). The conductivity of a single Pd-DNA nanowire, 127 Scm−1 was substantially...
Starting from the theory of MT, the paper gives an introduction for the current research status quo and the systematic principle of the high precision electromagnetic frequency spectrum(MES). It puts forward a linear relation that can be regarded as between exploring depth and electromagnetic frequency in local area, which makes it feasible that the stratum resistivity corresponds to the sounding...
Tower Type Sensor (TTS) system was developed to monitor depth-related electrical resistivity in chloride-contaminated concrete. The AC impedance method was adopted to measure the electrical resistivity of concrete. This paper also details arrangements of TTS and its calibration approach. Then the sensor geometric constant k was determined by 0.01 mol/L KCl solution. In view of the RC circuit characteristics...
Thin films of Ga2O3-In2O3 are obtained by magnetron deposition with further thermal oxidation. Dependences of resistance variation on time under strain and on strain value are observed. The model for explaining the obtained results is developed. It is based on the barrier conductivity of polycrystalline oxide semiconductor materials.
Electrically conductive adhesives (ECA) are popular solutions for joining relatively large (> 500 mum) electrical interfaces or when lower-temperature requirements preclude soldering or brazing. When assembled by squeezing between two flat, rectangular surfaces, the flow dynamics of the conductive filler and matrix can induce variations in local electrical conductance. This becomes significant...
A novel stress-sensitive nanocomposite that can be used as flexible force sensors with tailored sensitivity was fabricated. The nanocomposite consists of MWNTs as conductive filler and SBS as polymer matrix. Some electrical and mechanical properties of MWNT/SBS films were measured. A typical percolation phenomenon was observed with the MWNT/SBS composites. The elastic modulus and Poisson's ratio of...
A micro flow sensor with high temperature coefficient of resistance (TCR) is very important because of its high sensitivity of flow sensors. Different from the conventional positive-TCR Pt film used in micro flow sensor with self-heating, higher negative-TCR micro flow sensor without self-heating is developed and fabricated in this research. The novel TaN-material micro liquid flow sensors are fabricated...
This paper introduces the concept of nanoelectromechanical systems on a tip (NEMS-on-a-tip). As an example, force sensors based on the interlayer electromechanical coupling of individual multi-walled carbon nanotubes (MWNT) are designed with various configurations. The devices are fabricated and characterized using nanorobotic manipulation inside a scanning electron microscope (SEM). Experimental...
In this study, we fabricated in-plane thermoelectric micro-generators (4 mm times 4 mm) based on bismuth telluride thin films by using flash evaporation method. The thermoelectric properties of as-grown thin films are lower than those of bulk materials. Therefore the as-grown thin films were annealed in hydrogen at atmospheric pressure for 1 hour in a temperature range of 200 degC. to 400degC. By...
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