A resistive type humidity sensor based on crystalline tin oxide nanoparticles encapsulated in polyaniline matrix

Shukla, Shipra; Shukla, Sudheesh K.; Govender, Penny Poomani; Agorku, Eric Selorm

doi:10.1007/s00604-015-1678-2

Cited by 90 publications

(25 citation statements)

References 32 publications

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“…We have compared the performance of our device with that of previously reported oxide-based humidity sensors in table 2 [2, 3, 29, 59-62, 64, 65]. Our device exhibits high sensitivity (90.8%) at relatively low RH (76%) which signifies better humidity sensing performance than that of V 2 O 5 thin films/nanosheets [2,29] and other previously reported oxide based humidity sensors [59,60,62,64]. The response/recovery times of our device are also faster than those of other oxide-based humidity sensors reported [29,59,61,62,65].…”

Section: Sensingmentioning

confidence: 77%

“…The high conductivity at higher humid environments is due electrons donated by the more physisorbed water molecules onto n-type V 2 O 5 thereby pushing Femi level closer to the conduction band thereby enhancing conductivity of the sensor with increasing RH [2]. The sensitivity of the device was determined from the relation = [29,[59][60][61] where R H is resistance of sensor at different RH and R A is resistance of sensor in dry air. Sensitivity was found to be linearly dependent on RH as given in figure 7(d).…”

Section: Sensingmentioning

confidence: 99%

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Enhanced humidity responsive ultrasonically nebulised V₂O₅ thin films

et al. 2020

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A large surface to volume ratio and easily accessible active reaction sites are key attributes for a good gas sensing material. Herein, we report synthesis, characterisation and humidity sensing properties of phase pure 420 nm thick low temperature (350°C) polycrystalline V 2 O 5 thin films deposited on quartz substrate by ultrasonic nebulized spray pyrolysis of aqueous combustion mixture (UNSPACM). The thin films were characterized by x-ray diffraction, Raman spectroscopy, atomic force microscope, field emission scanning microscope, transmission electron microscope, UV-visible spectroscopy and XPS. The highly porous and nanocrystalline characteristic of V 2 O 5 thin films synthesized by this technique provide large surface to volume ratio and easily accessible active reaction sites making it a prominent material for gas sensing applications. The fabricated humidity sensor based on V 2 O 5 thin films exhibited high sensitivity with good stability and reproducibility at room temperature. The sensor exhibited high sensitivity of 90.8% at 76% RH with response time of 35-60 s and recovery time of 7-54 s. We believe this method provides means for large-scale synthesis of V 2 O 5 thin films for several gas sensing applications. OPEN ACCESS RECEIVED

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Section: Sensingmentioning

confidence: 77%

Section: Sensingmentioning

confidence: 99%

Enhanced humidity responsive ultrasonically nebulised V₂O₅ thin films

et al. 2020

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“…On exposure to moisture, there is chemisorption of water molecules on activated sites of the ZnO grains. This vapor dissociates to form hydroxyl groups when water reacts with lattice oxygen 58 generating oxygen vacancies (O v ) as per eqn (7).…”

Section: Sensing Mechanismmentioning

confidence: 99%

“…Therefore, it is important to measure precisely the grain moisture levels. The basic principle of a humidity/moisture sensor is based on the change in the refractive index (optical), 2 mass (gravimetric), 3 dielectric constant (capacitive) 4,5 or in the conductivity (resistive) [6][7][8] of the active material with the moisture content. Furthermore, the essential properties of moisture sensors for their extensive use include low cost, high sensitivity, precision and good performance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced moisture sensing properties of a nanostructured ZnO coated capacitive sensor

et al. 2018

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“…Further, crystalline tin oxide (SnO 2 ) based flexible composite had shown good resistive sensitivity for humidity and gas sensor [21]. Recently, more interesting studies on humidity sensors of different spinel-type ceramics were investigated.…”

Section: Introductionmentioning

confidence: 99%

Uniformly Porous Nanocrystalline CaMgFe1.33Ti3O12 Ceramic Derived Electro-Ceramic Nanocomposite for Impedance Type Humidity Sensor

Tripathy

Pramanik

Manna

et al. 2016

Sensors

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Since humidity sensors have been widely used in many sectors, a suitable humidity sensing material with improved sensitivity, faster response and recovery times, better stability and low hysteresis is necessary to be developed. Here, we fabricate a uniformly porous humidity sensor using Ca, Ti substituted Mg ferrites with chemical formula of CaMgFe1.33Ti3O12 as humidity sensing materials by solid-sate step-sintering technique. This synthesis technique is useful to control the grain size with increased porosity to enhance the hydrophilic characteristics of the CaMgFe1.33Ti3O12 nanoceramic based sintered electro-ceramic nanocomposites. The highest porosity, lowest density and excellent surface-hydrophilicity properties were obtained at 1050 °C sintered ceramic. The performance of this impedance type humidity sensor was evaluated by electrical characterizations using alternating current (AC) in the 33%–95% relative humidity (RH) range at 25 °C. Compared with existing conventional resistive humidity sensors, the present sintered electro-ceramic nanocomposite based humidity sensor showed faster response time (20 s) and recovery time (40 s). This newly developed sensor showed extremely high sensitivity (%S) and small hysteresis of <3.4%. Long-term stability of the sensor had been determined by testing for 30 consecutive days. Therefore, the high performance sensing behavior of the present electro-ceramic nanocomposites would be suitable for a potential use in advanced humidity sensors.

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A resistive type humidity sensor based on crystalline tin oxide nanoparticles encapsulated in polyaniline matrix

Cited by 90 publications

References 32 publications

Enhanced humidity responsive ultrasonically nebulised V₂O₅ thin films

Enhanced humidity responsive ultrasonically nebulised V₂O₅ thin films

Enhanced moisture sensing properties of a nanostructured ZnO coated capacitive sensor

Uniformly Porous Nanocrystalline CaMgFe1.33Ti3O12 Ceramic Derived Electro-Ceramic Nanocomposite for Impedance Type Humidity Sensor

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A resistive type humidity sensor based on crystalline tin oxide nanoparticles encapsulated in polyaniline matrix

Cited by 90 publications

References 32 publications

Enhanced humidity responsive ultrasonically nebulised V2O5 thin films

Enhanced humidity responsive ultrasonically nebulised V2O5 thin films

Enhanced moisture sensing properties of a nanostructured ZnO coated capacitive sensor

Uniformly Porous Nanocrystalline CaMgFe1.33Ti3O12 Ceramic Derived Electro-Ceramic Nanocomposite for Impedance Type Humidity Sensor

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Enhanced humidity responsive ultrasonically nebulised V₂O₅ thin films

Enhanced humidity responsive ultrasonically nebulised V₂O₅ thin films