Humidity sensitive characteristics of Zn2SnO4–LiZnVO4 thick films prepared by the sol–gel method

Fu, Gang; Chen, Huan; Chen, Zhexiong; Zhang, Jinxiu; Kohler, Heinz

doi:10.1016/s0925-4005(01)00971-6

Cited by 104 publications

(53 citation statements)

References 13 publications

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“…The porous microstructure and the surface reactivity with water are key parameters for the performance of semiconducting humidity materials [42]. Water is absorbed by porous materials when they were exposed to humidity leading to an increase of their electrical conductivity [43][44][45]. The larger is the surface area, larger is the content of adsorbed water, and consequently larger is the density of charge carriers usually protons.…”

Section: Humidity Sensing Mechanismmentioning

confidence: 99%

Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO<sub>3</sub>

Rama¹,

Yadav²,

Chandkiram³

2011

JST

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In this paper zinc stannate (ZnSnO 3 ) nanoparticles was synthesized by a chemical precipitation method. The synthesized samples were characterized using X-ray powder diffraction (XRD), Differential scanning calorimetry (DSC) and UV-Visible absorption spectroscopy. Sensing material was made as pellet by hydraulic press machine under uniform pressure of 616 MPa. Then the material was annealed at 600˚C. Surface morphologies of the samples were analyzed using Scanning electron microscopy (SEM) for pellet of different weight ratio annealed at 600˚C. The XRD pattern indicates that ZnSnO 3 has a perovskite phase with an orthorhombic structure having minimum crystallite size 4 nm. Further, humidity sensing investigations of these sensing materials were done. Our result indicate that ZnSnO 3 in form of pellet annealed at 600˚C for 1:4 weight ratio was most sensitive of humidity in comparison to pure SnO 2 under same conditions. Maximum sensitivity of the sample was 3 GΩ/% RH which is better in comparison to pure SnO 2 . The results were reproducible up to ± 77% after 2 months of observations.

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Section: Humidity Sensing Mechanismmentioning

confidence: 99%

Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO<sub>3</sub>

Rama¹,

Yadav²,

Chandkiram³

2011

JST

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“…They take into account the chemisorbed and physisorbed layers of water molecules as well as the capillary condensation of water inside tiny pores. The performance of a ceramic humidity sensor is strongly influenced by the porous microstructure and by the surface reactivity with water [5]. The presence of a large pore volume with a convenient pore size distribution is considered fundamental to achieve a high humidity sensitivity [6].…”

Section: Introductionmentioning

confidence: 99%

Humidity sensing properties of a thick-film titania prepared by a slow spinning process

Faia

Furtado

Ferreira

2004

Sensors and Actuators B: Chemical

130

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A ceramic thick film humidity sensor was produced from an emulsion of titania powders by a spin coating technique using a low speed. Electrical measurements were taken between interdigital electrodes obtained by depositing silver paste on the oxide, then cured at 500 • C for 15 min. Different relative humidities of a dynamic atmosphere were obtained by mixing dry and 23 • C saturated synthetic air in convenient proportions. Complex impedance spectra of the titania sensor at various relative humidities (RH) and different temperatures were measured and compared. The humidity sensing behaviour is due to surface water molecules adsorption and capillary condensation. The proposed sensing mechanisms, explaining the registered impedance spectra, are a combination of proton hopping, hydronium electrical drift and diffusion, and electrolytic conduction. In the frequency range 1-400 Hz, resistance and capacitive reactance show variations of three to four-order magnitude over the RH range 10-100%. The curves representing the variations of resistance and capacitive reactance versus RH show clearly the existence of two dominant electrical charge transport mechanisms. A parameter called characteristic humidity is defined to represent the sensitive response of the sensor. It was found that the sensitivity was highly dependent on the frequency. This work also shows that, for the same RH, both resistance and capacitive reactance vary with the atmosphere temperature.

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“…(0.64 Å ) [23], it is worthwhile to investigate whether LiZnVO 4 and LiMgVO 4 would exhibit excellent microwave dielectric properties. LiMgVO 4 and LiZnVO 4 have attracted attention due to their wide use in widely used in electrochemical devices, humidity sensors and luminescence devices because of their interesting properties [24,25]. A recent study of the structure and cation distribution of LiMgVO 4 and LiZnVO 4 revealed that in LiMgVO 4 the cation distribution was partly disordered while higher cationic disorder was observed in LiZnVO 4 [26].…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior and microwave dielectric properties of LiMVO4 (M = Mg, Zn)

Wei

Luo

et al. 2015

J Mater Sci: Mater Electron

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Two V-containing microwave dielectric ceramics, LiMgVO 4 and LiZnVO 4 , with excellent microwave performance were prepared by a solid-state reaction route at relatively low temperatures. Using NH 4 VO 3 to replace V 2 O 5 could effectively reduce the sintering temperature of LiMgVO 4 and LiZnVO 4 to 720°C and enhance their microwave dielectric properties. LiMgVO 4 ceramics sintered at 720°C exhibited a permittivity *9.89, a Q 9 f value of 30,800 GHz and a temperature coefficient of resonant frequency *-171 ppm/°C. LiZnVO 4 ceramics had a relatively smaller s f value of -114 ppm/°C with a e r * 7.48, a Q 9 f value of 27,600 GHz. Further efforts are in progress to search for effective approaches to compensate their large negative s f values to be near zero.

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Humidity sensitive characteristics of Zn2SnO4–LiZnVO4 thick films prepared by the sol–gel method

Cited by 104 publications

References 13 publications

Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO<sub>3</sub>

Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO<sub>3</sub>

Humidity sensing properties of a thick-film titania prepared by a slow spinning process

Sintering behavior and microwave dielectric properties of LiMVO4 (M = Mg, Zn)

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Humidity sensitive characteristics of Zn2SnO4–LiZnVO4 thick films prepared by the sol–gel method

Cited by 104 publications

References 13 publications

Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO&lt;sub&gt;3&lt;/sub&gt;

Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO&lt;sub&gt;3&lt;/sub&gt;

Humidity sensing properties of a thick-film titania prepared by a slow spinning process

Sintering behavior and microwave dielectric properties of LiMVO4 (M = Mg, Zn)

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Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO<sub>3</sub>

Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO<sub>3</sub>