Excellent humidity sensing properties of cadmium titanate nanofibers

Imran, Zahid; Batool, S. S.; Jamil, Hira; Usman, Muhammad; Israr-Qadir, Muhammad; Shah, Shafqat H.; Jamil-Rana, Sadaf; Rafiq, M. A.; Hasan, M. M.; Willander, Magnus

doi:10.1016/j.ceramint.2012.06.048

Cited by 55 publications

(26 citation statements)

References 26 publications

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“…Therefore, only S1050/PDMS composite could be used to develop a flexible composite film with potentially the best in performance. The capacitance values of the S1050 ceramic and S1050/PDMS composite film were in the order of 10 −10 F and 10 −11 F, respectively, which closely resembled those of different nanoparticles and composites [50,51]. The capacitance value of the S1050/PDMS composite film is significantly higher than the other titanate fibrous materials [51].…”

Section: Resultsmentioning

confidence: 99%

“…The capacitance values of the S1050 ceramic and S1050/PDMS composite film were in the order of 10 −10 F and 10 −11 F, respectively, which closely resembled those of different nanoparticles and composites [50,51]. The capacitance value of the S1050/PDMS composite film is significantly higher than the other titanate fibrous materials [51]. Therefore, the S1050/PDMS composite film is capable of storing large amounts of electrical energy, which is necessary for several electronic and power devices [27].…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Characterizations of Novel Ca-Mg-Ti-Fe-Oxides Based Ceramic Nanocrystals and Flexible Film of Polydimethylsiloxane Composite with Improved Mechanical and Dielectric Properties for Sensors

Tripathy

Pramanik

Manna

et al. 2016

Sensors

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Armalcolite, a rare ceramic mineral and normally found in the lunar earth, was synthesized by solid-state step-sintering. The in situ phase-changed novel ceramic nanocrystals of Ca-Mg-Ti-Fe based oxide (CMTFOx), their chemical reactions and bonding with polydimethylsiloxane (PDMS) were determined by X-ray diffraction, infrared spectroscopy, and microscopy. Water absorption of all the CMTFOx was high. The lower dielectric loss tangent value (0.155 at 1 MHz) was obtained for the ceramic sintered at 1050 °C (S1050) and it became lowest for the S1050/PDMS nanocomposite (0.002 at 1 MHz) film, which was made by spin coating at 3000 rpm. The excellent flexibility (static modulus ≈ 0.27 MPa and elongation > 90%), viscoelastic property (tanδ = E″/E′: 0.225) and glass transition temperature (Tg: −58.5 °C) were obtained for S1050/PDMS film. Parallel-plate capacitive and flexible resistive humidity sensors have been developed successfully. The best sensing performance of the present S1050 (3000%) and its flexible S1050/PDMS composite film (306%) based humidity sensors was found to be at 100 Hz, better than conventional materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterizations of Novel Ca-Mg-Ti-Fe-Oxides Based Ceramic Nanocrystals and Flexible Film of Polydimethylsiloxane Composite with Improved Mechanical and Dielectric Properties for Sensors

Tripathy

Pramanik

Manna

et al. 2016

Sensors

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“…The maximum hysteresis response of ~3.4% at 100 Hz observed in the present electro-ceramic devices ensures the good reliability of our sensor. This hysteresis value of the present newly developed humidity sensor is significantly lower than many conventional resistive humidity sensors (LiZnVO 4 -doped SnO 2 ~6%, CdTiO 3 ~7%, BaTiO 3 nanofibers ~5%, BaTiO 3 /polystyrene sulfonic sodium ~8%, and so on) [51,53,62,63]. …”

Section: Resultsmentioning

confidence: 72%

“…Therefore, it indicates that the humidity change affects the impedance considerably at intermediate and low frequencies, but the change is very small at higher frequencies. In order to evaluate the impedance characteristics of a nanocomposite sensor as a function of humidity, device sensitivity (S Z ) can be estimated using Equation (4) [52,53]:

S_{Z} = \frac{sans-serifΔ normalZ}{sans-serifΔ % RH}

where ΔZ is change in impedance (i.e., Z′) at the corresponding change RH, i.e., Δ% RH. From Equation (4), the sensitivity of device is 0.23 MΩ/Δ% RH (33%–95% RH), 0.032 MΩ/Δ% RH, 0.68 kΩ/Δ% RH and 0.027 kΩ/Δ% RH at 10 2 , 10 3 , 10 4 and 10 6 Hz, respectively.…”

Section: Resultsmentioning

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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“…Among the 1-D nanostructured materials synthesized during the last few decades, titanates family have attracted much interest. 1, 2 These titanate materials keep potential applications covering a wide variety of fields including dye-sensitized solar cells, 3 transparent optical devices, 4 photocatalysis, 5 sensors, 6 energy storage devices. 7 These are also being used as a substrate to decorate with different active catalysts.…”

Section: Introductionmentioning

confidence: 99%

Charge carrier transport mechanisms in perovskite CdTiO3 fibers

2014

Self Cite

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Mechanism behind the high thermoelectric power factor of SrTiO3 by calculating the transport coefficients J. Appl. Phys. 113, 053705 (2013); 10.1063/1.4788809Generation-dependent charge carrier transport in Cu(In,Ga)Se2/CdS/ZnO thin-film solar-cells Electrical transport properties of electrospun cadmium titanate (CdTiO 3 ) fibers have been investigated using ac and dc measurements. Air annealing of as spun fibers at 1000 • C yielded the single phase perovskite fibers having diameter ∼600 nm -800 nm. Both the ac and dc electrical measurements were carried out at temperatures from 200 K -420 K. The complex impedance plane plots revealed a single semicircular arc which indicates the interfacial effect due to grain boundaries of fibers. The dielectric properties obey the Maxwell-Wagner theory of interfacial polarization. In dc transport study at low voltages, data show Ohmic like behavior followed by space charge limited current (SCLC) with traps at higher voltages at all temperatures (200 K -420 K). Trap density in our fibers system is N t = 6.27 × 10 17 /cm 3 . Conduction mechanism in the sample is governed by 3-D variable range hopping (VRH) from 200 K -300 K. The localized density of states were found to be N(E F ) = 5.51 × 10 21 eV −1 cm −3 at 2 V. Other VRH parameters such as hopping distance (R hop ) and hopping energy (W hop ) were also calculated. In the high temperature range of 320 K -420 K, conductivity follows the Arrhenius law. The activation energy found at 2 V is 0.10 eV.

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Excellent humidity sensing properties of cadmium titanate nanofibers

Cited by 55 publications

References 26 publications

Synthesis and Characterizations of Novel Ca-Mg-Ti-Fe-Oxides Based Ceramic Nanocrystals and Flexible Film of Polydimethylsiloxane Composite with Improved Mechanical and Dielectric Properties for Sensors

Synthesis and Characterizations of Novel Ca-Mg-Ti-Fe-Oxides Based Ceramic Nanocrystals and Flexible Film of Polydimethylsiloxane Composite with Improved Mechanical and Dielectric Properties for Sensors

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

Charge carrier transport mechanisms in perovskite CdTiO3 fibers

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