Polyaniline based impedance humidity sensors

This study presents the design and fabrication of carbon nanotubes (CNTs) film based temperature sensor. The sensor has been fabricated by the sequential deposition of thin layers of glue and CNT nanopowder on a paper substrate. The diameter of multiwalled nanotubes (MWNTs) varied between 10 and 30 nm. The ostensible thickness of the CNT films in the samples was ∼30–40 μm. The inter-electrodes distance (length) and width of the surface-type samples were 5 and 4 mm, respectively. The results revealed that the DC resistance of the sensors decreases in average by 10–20% as the temperature increases from 20 to 75 °C. The resistance–temperature relationship was simulated.

Carbon nanotubes film based temperature sensors

Impedimetric humidity and temperature sensing properties of chitosan-CuMn2O4 spinel nanocomposite

Humidity and temperature sensing properties of copper oxide–Si-adhesive nanocomposite

This study presents the fabrication and investigation of humidity sensors based on orange dye (OD) and polyaniline (PANI) composite films. A blend of 3 wt.% OD with 1 wt.% PANI was prepared in 1 ml water. The composite films were deposited on glass substrates between pre-deposited silver electrodes. The gap between the electrodes was 45 μm. The sensing mechanism was based on the impedance and capacitance variations due to the absorption/desorption of water vapor. It was observed that with the increase in relative humidity (RH) from 30% to 90%, the impedance decreases by 5.2×104 and 8.8×103 times for the frequencies of 120 Hz and 1 kHz, respectively. The impedance—humidity relationship showed a more uniform change compared to the capacitance—humidity relationship in the RH range of 30% to 90%. The consequence of annealing, measuring frequency, response and recovery time, and absorption—desorption behavior of the humidity sensor were also discussed in detail. The annealing resulted in an increase in sensitivity of up to 2.5 times, while the measured response time and recovery time were 34 s and 450 s, respectively. The impedance—humidity relationship was simulated.

http://iopscience.iop.org/article/10.1088/1674-1056/22/1/010701/pdf

Orange dye—polyaniline composite based impedance humidity sensors

Engineering Mathematics: A Modern Foundation for Electronic, Electrical and Control Engineers

Mathematics For Engineers: A Modern Interactive Approach

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Engineering Mathematics: A Foundation for Electronic, Electrical, Communications, and Systems Engineers

Mathematics For Engineers

Engineering Mathematics

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