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.

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.

Poly(vanadium–molybdenum acid) xerogel thin films fabricated by the sol-gel process and their humidity-sensing properties

2000 ◽  
Vol 15 (12) ◽  
pp. 2653-2657 ◽  
Author(s):  
Maosong Tong ◽  
Guorui Dai ◽  
Yuanda Wu ◽  
Xiuli He ◽  
Wei Yan ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermogravimetric Analysis ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Humidity Sensing ◽  
X Ray ◽  
Sensing Properties ◽  
Sol Gel Process ◽  
Humidity Sensing Properties

Thermogravimetric analysis, x-ray photoelectron spectroscopy, and x-ray diffraction results and the humidity sensing properties of poly(vanadium–molybdenum acid) H2V9.5Mo2.5O32.0 · 8.8H2O xerogel thin films, which were fabricated by the sol-gel process, are described in this paper. The conductance and the capacitance of the thin films strongly depend on the relative humidity. Different electrodes have different influences on the humidity-sensing properties of the thin films.

scholarly journals Comparative Study of Structural, Morphological and Humidity Sensing Properties of Pure WO3 and Cu2O-WO3 Nanocomposite

2020 ◽  
Vol 32 (9) ◽  
pp. 2335-2341
Author(s):  
NARENDRA KUMAR PANDEY ◽  
SANCHITA SINGH ◽  
PRIYA GUPTA
Keyword(s):  
Annealing Temperature ◽  
X Ray Diffraction ◽  
Humidity Sensors ◽  
High Reproducibility ◽  
Humidity Sensing ◽  
X Ray ◽  
Sensing Properties ◽  
Resistive Type ◽  
Commercial Applications ◽  
Humidity Sensing Properties

This work reports the enhancement of humidity sensing properties of tungsten trioxide (WO3) by the formation of nanocomposite with cuprous oxide (Cu2O). A 0.1 g of Cu2O was mixed with 0.9 g of WO3. Pellets of pure WO3 and the obtained mixture are prepared at pressure of 250 MPa applied for 0.5 h. The pellets were then annealed at 300 ºC, 400 ºC, 500 ºC and 600 ºC. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyzed the crystallinity and morphology of as-prepared pellets surface. Humidity sensing application of pellets is studied in a specially designed chamber. It is observed that as relative humidity increases, there is decrease in the resistance of the pellets. The humidity-sensing investigation (10-99%RH) showed that the nanocomposite of Cu2O with WO3 annealed at 600 ºC, is having the best sensitivity, low hysteresis, less ageing and high reproducibility than pure WO3. It is also observed that as annealing temperature increases from 300 to 600 ºC, sensitivity increases. The present investigation could be useful for fabrication of resistive type humidity sensors for commercial applications.

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.

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.

Fabrication, structural and humidity sensing properties of BaTiO3 nanofibers via electrospinning

2015 ◽  
Vol 29 (12) ◽  
pp. 1550066 ◽  
Author(s):  
Chen-Hao Sheng ◽  
Hong-Di Zhang ◽  
Shuai Chen ◽  
Jun-Cheng Zhang ◽  
Wen-Peng Han ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Recovery Time ◽  
Room Temperature ◽  
Electrospinning Technique ◽  
Humidity Sensing ◽  
X Ray ◽  
Sensing Properties ◽  
Transmission Electron ◽  
Humidity Sensitivity ◽  
Humidity Sensing Properties

Barium titanate (BTO) nanofibers were synthesized by electrospinning and followed calcination. The morphologies and microstructures of the nanofibers were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Calcinating temperature and process greatly influenced the surface morphology of the nanofibers. In addition, parallel BTO nanofibers were also successfully produced by a centrifugal electrospinning technique. And the humidity sensing properties of the nanofibers were measured. The results showed an ultrafast response time (~0.5 s) and a recovery time (~0.4 s) to humidity at room temperature, which revealed excellent humidity sensitivity performance.

scholarly journals Electrical and Humidity-Sensing Properties of Impedance-Type Humidity Sensors that Were Made of Ag Microwires/PPy/SnO2 Ternary Composites

Chemosensors ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 92
Author(s):  
Pi-Guey Su ◽  
Ping-Hsiang Lu
Keyword(s):  
Composite Film ◽  
Humidity Sensor ◽  
Composite Films ◽  
Complex Impedance ◽  
Humidity Sensors ◽  
Ternary Composite ◽  
Humidity Sensing ◽  
X Ray ◽  
Sensing Properties ◽  
Humidity Sensing Properties

Impedance-type humidity sensors were fabricated via one-step UV-irradiation photopolymerization of Ag microwires (Ag MWs), polypyrrole (PPy) and SnO2 ternary composite (Ag MWs/PPy/SnO2) films on an alumina substrate. X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) coupled with an energy dispersive X-ray (EDX) elemental mapping were used to analyze the morphology, structure, and composition of Ag MWs/PPy/SnO2 ternary composite films. Microstructural observations revealed that the Ag MWs were embedded, and PPy formed on the surface of the Ag MWs/PPy/SnO2 ternary composite film. The effects of the addition amounts of loading of Ag and PPy on the electrical and humidity-sensing properties of the Ag MWs/PPy/SnO2 ternary composite films were investigated. The impedance-type humidity sensor based on Ag MWs/PPy/SnO2 ternary composite film containing 6 mg of Ag and 0.1 g of PPy had the highest sensitivity and an acceptable linearity over the RH ranged from 10% to 90% RH, a low hysteresis, a fast response time, and long-term stability. This technique is useful for practical application because its fast and ease of fabrication. The ions (H3O+) that dominate the impedance changed with relative humidity (RH) for the humidity sensor that based on Ag MWs/PPy/SnO2 ternary composite film was analyzed using complex impedance spectra.

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