Screen-printed MgAl2O4 semi-thick film based highly sensitive and stable capacitive humidity sensor

Das, Suresh; Rahman, Lutfor; Mondal, Partha Pratim; Mahapatra, P. K.; Saha, Dibyajyoti

doi:10.1016/j.ceramint.2021.08.260

Cited by 19 publications

(6 citation statements)

References 55 publications

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“…Figure 8b shows that Cu 2p binding energies at 933.2 eV and 935.0 eV are the typical binding energies for CuO and CuAl 2 O 4 [30,31]. As shown in Figure 8c, the Mg 1s spectrum shows three peaks at 1303.9, 1304 and 1306.4 eV, corresponding to MgO, MgAl 2 O 4 and MgF 2 [32], respectively. In Figure 8d, the spectrum of O 1s exhibited multiple peaks, at 530.8, 531.4, 531.5 and 532.1 eV, corresponding to WO 3 , CuAl 2 O 4 , MgAl 2 O 4 and MgO [33,34], respectively.…”

Section: Phase and Chemical Composition Of Black Mao Coatingmentioning

confidence: 81%

Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment

Wang

Geng

et al. 2022

Materials

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The effects of CuSO4 concentration, voltage and treating time on the hemisphere emissivity and corrosion resistance of AZ31B magnesium-alloy black micro-arc oxidation coatings were studied by orthogonal experiment. The microstructure, phase composition, corrosion resistance and hemisphere emissivity of the coating were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, electrochemical test and infrared emissivity spectrometer, respectively. The results showed that the influences of each factor on corrosion current density and the hemisphere emissivity are as follows: voltage > treating time > CuSO4 concentration. The black MAO coatings are mainly composed of WO3, MgAl2O4, CuAl2O4, MgO, CuO and MgF2. The CuO and CuAl2O4 phases are the main reasons for blackness of the coatings. The coating exhibits the best corrosion resistance under the conditions of CuSO4 concentration 1.5 g/L, oxidation voltage 500 V and treating time 10 min. Additionally, the variation trends of hemispherical emissivity and roughness of the black MAO coating are the same when the composition of the coatings is similar. When the concentration of CuSO4 is 1.5 g/L, the oxidation voltage is 450 V and the treatment time is 10 min, the coating with the highest hemispherical emissivity of 0.84 can be obtained.

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Section: Phase and Chemical Composition Of Black Mao Coatingmentioning

confidence: 81%

Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment

Wang

Geng

et al. 2022

Materials

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“…10 c) at the binding energy 529.7 eV was attributed for lattice Fe 3+ -O bonded oxygen and 531.4 eV for oxygen bonded with moisture molecule associated on the surface of the γ-Fe 2 O 3 nanoparticles by physisorption process [ 79 ]. The FWHM of the peak 2.84 eV suggest the chemisorption phenomena in the sample [ 80 ]. So, the interaction of moisture with the synthesized γ-Fe 2 O 3 nanoparticles following chemisorption and physisorption methods recommend the suitability as humidity sensor.…”

Section: Resultsmentioning

confidence: 99%

Extraction of gamma iron oxide (γ-Fe2O3) nanoparticles from waste can: Structure, morphology and magnetic properties

Biswas,

Rahman,

Ahmed

et al. 2024

Heliyon

Self Cite

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“…As shown in Figure a, there is an abrupt change in the sensitivity curve of the sensor at 60% RH; this can be ascribed to the reach of the critical humidity condition. At this critical condition, the way the water molecules are absorbed changes from chemisorption to physisorption. − Especially when RH is below the critical condition, the number of water molecules is not large enough to form a continuous layer, whereas beyond the critical point, excess water molecules tend to form more layers on the sensing material. , In such a condition, the transfer of condensed water to the positions of electrodes becomes possible. Consequently, we obtained linear relationships between the capacitance and RH, one for each humidity range.…”

Section: Resultsmentioning

confidence: 99%

“…43−45 Especially when RH is below the critical condition, the number of water molecules is not large enough to form a continuous layer, whereas beyond the critical point, excess water molecules tend to form more layers on the sensing material. 46,47 In such a condition, the transfer of condensed water to the positions of electrodes becomes possible.…”

Section: Sensing Mechanismmentioning

confidence: 99%

Wafer-Level, High-Performance, Flexible Sensors Based on Organic Nanoforests for Human–Machine Interactions

Zhao

Chen

Zhao

et al. 2023

ACS Appl. Mater. Interfaces

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High-performance flexible sensors are essential for real-time information analysis and constructing noncontact communication modules for emerging human−machine interactions. In these applications, batch fabrication of sensors that exhibit high performance at the wafer level is in high demand. Here, we present organic nanoforest-based humidity sensor (NFHS) arrays on a 6 in. flexible substrate prepared via a facile, cost-effective manufacturing approach. Such an NFHS achieves state-of-the-art overall performance: high sensitivity and fast recovery time; the best properties are at a small device footprint. The high sensitivity (8.84 pF/% RH) and fast response time (5 s) of the as-fabricated organic nanoforests are attributed to the abundant hydrophilic groups, the ultra-large surface area with a huge number of nanopores, and the vertically distributed structures beneficial to the transfer of molecules up and down. The NFHS also exhibits excellent long-term stability (90 days), superior mechanical flexibility, and good performance repeatability after bending. With these superiorities, the NFHS is further applied as a smart noncontact switch, and the NFHS array is used as the motion trajectory tracker. The wafer-level batch fabrication capability of our NFHS provides a potential strategy for developing practical applications of such humidity sensors.

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Screen-printed MgAl2O4 semi-thick film based highly sensitive and stable capacitive humidity sensor

Cited by 19 publications

References 55 publications

Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment

Study on Microstructure and Properties of Black Micro-Arc Oxidation Coating on AZ31 Magnesium Alloy by Orthogonal Experiment

Extraction of gamma iron oxide (γ-Fe2O3) nanoparticles from waste can: Structure, morphology and magnetic properties

Wafer-Level, High-Performance, Flexible Sensors Based on Organic Nanoforests for Human–Machine Interactions

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