scholarly journals AC Humidity Sensing Properties of Mesoporous K2CO3-SiO2Composite Materials

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Liang Guo ◽  
Xuefeng Chu ◽  
Xiaohong Gao ◽  
Chao Wang ◽  
Yaodan Chi ◽  
...  
Keyword(s):  
Composite Material ◽  
Mesoporous Silica ◽  
Complex Impedance ◽  
Ion Transfer ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Response And Recovery ◽  
Humidity Range ◽  
Humidity Sensing Properties

The mesoporous silica SBA-15 and mesoporous K2CO3-SiO2composite material were synthesized. Characterization of microstructure and morphology of materials indicated that the composite material had saved the porous framework of mesoporous silica SBA-15. Humidity sensing properties of different inverse proportion K2CO3-SiO2composite material were studied and we found that the sample with 0.16 g/g K2CO3exhibited excellent linearity in the wide humidity range. The complex impedance changed five orders of magnitude from 11% RH to 95% RH. The rapid response and recovery time were 10 s and 38 s, respectively. Finally a feasible ion transfer mechanism was brought forward to explain the sensing mechanism.

Evaluate humidity sensing properties of novel TiO2–WO3 composite material

2013 ◽  
Vol 48 (10) ◽  
pp. 3822-3828 ◽  
Author(s):  
Wang-De Lin ◽  
De-Sheng Lai ◽  
Min-Hung Chen ◽  
Ren-Jang Wu ◽  
Fu-Chou Chen
Keyword(s):  
Composite Material ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Humidity Sensing Properties

Investigations of the humidity sensing properties of side-chain-type sulfonated poly (arylene ether ketone)s

2019 ◽  
Vol 31 (9-10) ◽  
pp. 1248-1258
Author(s):  
Fanting Meng ◽  
Zhuang Zhuang ◽  
Yurong Zhang ◽  
Hui Na
Keyword(s):  
Complex Impedance ◽  
Fast Response ◽  
Side Chain ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Arylene Ether ◽  
Ether Ketone ◽  
Chain Type ◽  
Humidity Sensing Properties ◽  
Sulfonated Poly

Side-chain-type sulfonated poly (arylene ether ketone)s containing naphthalene moieties with a degree of sulfonation (Ds) from 0.2 to 1.9 were synthesized. Humidity sensors were fabricated by cast coating on silver–palladium interdigital microelectrodes. The properties of this series of materials in terms of water absorption, glass transition temperature, and humidity sensing were characterized in detail. The investigations on the humidity sensing performance showed that with the increase in the Ds, the hysteresis of our materials exhibits an increasing trend first, followed by a decrease. This special phenomenon has not been reported before and caught our attention. From the results of humidity sensing properties, among the materials, the one with 0.2 Ds is promising for applications in humidity sensing due to its small hysteresis and fast response to varied relative humidity (RH). For a better understanding of the humidity sensing behavior of the sensor, complex impedance spectra were also measured. In the long-term stability measurement, the deviation of the measured impedance of the sensor at 97% RH is not obvious, proving good stability in a humid environment.

Humidity sensing properties of spray deposited Fe doped TiO2 thin film

2021 ◽  
Vol 42 (12) ◽  
pp. 122805
Author(s):  
Dipak L Gapale ◽  
Pranav P. Bardapurkar ◽  
Sandeep A. Arote ◽  
Sanjaykumar Dalvi ◽  
Prashant Baviskar ◽  
...  
Keyword(s):  
Spray Pyrolysis Technique ◽  
Structural Parameters ◽  
Texture Coefficient ◽  
Volume Percentage ◽  
Humidity Sensing ◽  
X Ray ◽  
Sensing Properties ◽  
Dislocation Densities ◽  
Response And Recovery ◽  
Humidity Sensing Properties

Abstract In the present work, ferrite (Fe) doped TiO2 thin films with different volume percentage (vol%) were synthesized using a spray pyrolysis technique. The effect of Fe doping on structural properties such as crystallite size, texture coefficient, microstrain, dislocation densities etc. were evaluated from the X ray diffratometry (XRD) data. XRD data revealed a polycrystalline anatase TiO2 phase for sample synthesized up to 2 vol% and mixed anatase and rutile crystalline phase for sample synthesized at 4 vol% Fe doped TiO2. The crystalline size was observed to decrease with increase in Fe dopant vol% and also other structural parameters changes with Fe dopant percentage. In the present work, electrical resistance was observed to decrease with a rise in Fe dopant vol% and temperature of the sample. Thermal properties like temperature coefficient of resistance and activation energy also showed strong correlation with Fe dopant vol%. Humidity sensing properties of the synthesized sample altered with a change in Fe dopant vol%. In the present paper, maximum sensitivity of about 88.7% for the sample synthesized with 2 vol% Fe doped TiO2 and also the lowest response and recovery time of about 52 and 3 s were reported for the same sample.

Study on humidity sensing properties based on composite materials of Li-doped mesoporous silica A-SBA-15

2008 ◽  
Vol 128 (2) ◽  
pp. 482-487 ◽  
Author(s):  
Tong Zhang ◽  
Rui Wang ◽  
Wangchang Geng ◽  
Xiaotian Li ◽  
Qi Qi ◽  
...  
Keyword(s):  
Composite Materials ◽  
Mesoporous Silica ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Humidity Sensing Properties

Humidity sensing properties of SrTiO3 nanospheres with high sensitivity and rapid response

RSC Advances ◽  
2015 ◽  
Vol 5 (29) ◽  
pp. 22879-22883 ◽  
Author(s):  
Dongmei Li ◽  
Jingjing Zhang ◽  
Liang Shen ◽  
Wei Dong ◽  
Caihui Feng ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Rapid Response ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Response And Recovery ◽  
First Time ◽  
Humidity Sensing Properties

SrTiO3 Nanospheres were employed for the first time to detect humidity and showed ultrafast response and recovery speeds.

scholarly journals Complex Impedance Analysis of the Humidity Sensing Properties of Polypyrrole

2009 ◽  
Vol 25 (02) ◽  
pp. 327-330 ◽  
Author(s):  
WANG Rui ◽  
◽  
ZHANG Tong ◽  
HE Yuan ◽  
GENG Wang-Chang ◽  
...  
Keyword(s):  
Complex Impedance ◽  
Impedance Analysis ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Complex Impedance Analysis ◽  
Humidity Sensing Properties

Synthesis of LiCl Doped Hollow TiO2 Nanofibers via Electrospinning and Their Humidity-Sensing Properties

2012 ◽  
Vol 476-478 ◽  
pp. 1116-1120
Author(s):  
Hui Min Huang ◽  
Jie Yu ◽  
Ce Wang
Keyword(s):  
Electron Microscopy ◽  
X Ray Diffraction ◽  
Hollow Nanofibers ◽  
Humidity Sensing ◽  
Sensing Properties ◽  
Transmission Electron ◽  
Response And Recovery ◽  
Doped Titania ◽  
The Relationship ◽  
Humidity Sensing Properties

LiCl doped titania (TiO2) hollow nanofibers were prepared by using polylactide (PLA) nanofibers as templates. The morphology and crystal structure of the TiO2hollow nanofibers were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The as-prepared LiCl doped TiO2hollow nanofibers exhibited a good humidity-sensing property. During the relative humidity (50%-95%) measurement, the response and recovery time is about 3 and 4 s, separately, with good linearity. The relationship between the humidity-sensing properties and the structure of the hollow nanofibers was also discussed. These distinguished and sensitive sensing performances make this material a good candidate in fabricating humidity sensors.

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