scholarly journals Dielectric and gas sensing properties of in situ electrochemically polymerized PPy-MgO-WO3 nanocomposite films

2021 ◽  
pp. 2915-2933
Author(s):  
Yahya Abbas ◽  
Ahmed Abbas
Keyword(s):  
Indium Tin Oxide ◽  
Gas Sensing ◽  
Metal Oxide Nanoparticles ◽  
Nanocomposite Films ◽  
Ammonia Gas ◽  
Weight Percentage ◽  
Polypyrrole Films ◽  
Gas Sensing Properties ◽  
Ammonia Detection

     A polypyrrole-based ammonia-detection gas sensor was studied in this work. Under a 1.6 V electrodeposition potential, polypyrrole (PPy) was electrochemically synthesized from an aqueous solution of 0.1 M pyrrole and 0.1 M oxalic acid. An extension to the polypyrrole films was applied through electrochemical deposition on indium tin oxide (ITO), using the metal oxide nanoparticles of MgO and WO3. These films were investigated for their sensing behavior towards NH3 at different working temperatures and different weight percentages of nanoparticles .The measurements of A.C conductivity were conducted over a frequency range of 101-105 Hz and temperature range of 298-423 K . The highest electrical conductivity was equal to 3.67x10-1 Ω.cm-1 at a temperature of 323 K and frequency of 105H z. The experimental results showed that the sensitivity of the undoped and doped PPy with nanoparticle films to ammonia gas changes with the change in temperature and weight percentage.

Enhancing the NO2 gas sensing properties of rGO/SnO2 nanocomposite films by using microporous substrates

2017 ◽  
Vol 248 ◽  
pp. 560-570 ◽  
Author(s):  
Xiangyi Zhu ◽  
Yongcai Guo ◽  
Hao Ren ◽  
Chao Gao ◽  
Yong Zhou
Keyword(s):  
Gas Sensing ◽  
Nanocomposite Films ◽  
Sensing Properties ◽  
Gas Sensing Properties

Room temperature ammonia gas sensing properties of polyaniline nanofibers

2019 ◽  
Vol 30 (9) ◽  
pp. 8371-8380 ◽  
Author(s):  
S. B. Kulkarni ◽  
Y. H. Navale ◽  
S. T. Navale ◽  
F. J. Stadler ◽  
V. B. Patil
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Sensing Properties ◽  
Polyaniline Nanofibers ◽  
Gas Sensing Properties

In situ growth of WO3 nanotube arrays and their H2S gas sensing properties for reduced operating temperature

2020 ◽  
Vol 271 ◽  
pp. 127716
Author(s):  
Xiaoguang San ◽  
Yiming Lu ◽  
Guosheng Wang ◽  
Dan Meng ◽  
Xiaohui Gong ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Operating Temperature ◽  
Nanotube Arrays ◽  
In Situ Growth ◽  
Sensing Properties ◽  
Gas Sensing Properties

Effect of Au Doped WO3 Gas Sensors for NO2 Detection

2011 ◽  
Vol 492 ◽  
pp. 308-311 ◽  
Author(s):  
Wu Bin Gao ◽  
Cheng Dong ◽  
Xu Liu ◽  
Yun Han Ling ◽  
Jia Lin Sun
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Point Contact ◽  
X Ray ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Tungsten Filaments ◽  
Gas Response ◽  
Contact Sensors

Gas sensor based on point contact tungsten trioxide (WO3) was prepared by in-situ induction-heating thermal oxidation of tungsten filaments. X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM) were employed to analyze the phase and the morphology of the fabricated thin films. The results showed that the WO3films exhibited a monoclinic phase and were composed of hierarchical micro and nano crystals. The NO2(1-8 ppm) sensing properties of the point contact sensors based on Pure and Au-sputtering doped (2.5 at%) WO3films were investigated. The results showed that the gas sensing properties of the Au (2.5 at%) doped WO3sensors were superior to those of the undoped. The obtained point contact WO3sensor exhibited the maximum NO2gas response at 100°C.

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