scholarly journals Crystalline WO3 nanoparticles for No2 sensing

2020 ◽  
Vol 14 (4) ◽  
pp. 282-292
Author(s):  
Branko Matovic ◽  
Jelena Lukovic ◽  
Dejan Zagorac ◽  
Olga Ivanova ◽  
Alexander Baranchikov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Low Temperature ◽  
Tungsten Oxide ◽  
Room Temperature ◽  
Sensor Response ◽  
Literature Survey ◽  
Oxide Nanoparticles ◽  
Sensor Signal ◽  
Sensor Properties ◽  
Tungsten Oxide Nanoparticles

This study shows excellent NO2-sensing properties of tungsten oxide nanoparticles, prepared using a facile procedure which includes dissolution of metallic tungsten in hydrogen peroxide with subsequent low-temperature (400 ?C) heating. We also conducted a thorough literature survey on sensor properties of tungsten oxide prepared by various means and found that the sensor response towards NO2 registered in this work achieved the highest level. The most intriguing feature of the material obtained was a highly reproducible sensor signal at room temperature which was more than 100 times higher than any reported previously for WO3. The probable reason for such high sensor response was the presence of two WO3 polymorphs (-WO3 and h-WO3) in the material synthesized using a peroxide-assisted route. In order to further investigate synthesizedWO3 materials, sophisticated experimental (XRD, SEM, TEM, BET) and theoretical (B3LYP, HSE) methods have been used, as well as resistance and sensor response measurements at various temperatures.

Ionic liquid-assisted synthesis of tungsten oxide nanoparticles with enhanced NO2 sensing properties at near room temperature

2020 ◽  
Vol 505 ◽  
pp. 144533 ◽  
Author(s):  
Yujiao Zhang ◽  
Xiaoli Cheng ◽  
Xianfa Zhang ◽  
Zoltán Major ◽  
Yingming Xu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Tungsten Oxide ◽  
Room Temperature ◽  
Oxide Nanoparticles ◽  
Sensing Properties ◽  
Tungsten Oxide Nanoparticles

scholarly journals Methods of preparation of metal-doped and hybrid tungsten oxide nanoparticles for anticancer, antibacterial, and biosensing applications

2021 ◽  
pp. 101641
Author(s):  
Anirudh Sharma ◽  
Adesh K. Saini ◽  
Nitin Kumar ◽  
Neeraj Tejwan ◽  
Th Abhishek Singh ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Oxide Nanoparticles ◽  
Tungsten Oxide Nanoparticles ◽  
Metal Doped

scholarly journals Synthesis and Characterization of Nano-Tungsten Oxide Precipitated onto Natural Inorganic Clay for Humidity-Sensing Applications

Ceramics ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 120-127 ◽  
Author(s):  
Ahmed Afify ◽  
Ahmed Elsayed ◽  
Mohamed Hassan ◽  
Mohamed Ataalla ◽  
Amr Mohamed ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tungsten Oxide ◽  
Diffraction Field ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Transmission Electron ◽  
Tungsten Oxide Nanoparticles ◽  
Inorganic Clay

A wet chemical method was used to obtain tungsten oxide nanoparticles from tungsten tetrachloride and natural microfibrous inorganic clay (sepiolite) as a starting material. Precipitation of tungsten oxide species onto sepiolite under basic conditions and subsequent thermal treatment was investigated, prompted by the abundance of sepiolite in nature and the useful environmental applications that could be attained. Laser granulometry, X-ray diffraction, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), and high-resolution transmission electron microscopy (HR-TEM) techniques were used to study the particle-size distribution, the morphology, and the composition of the prepared sample. Our findings show the presence of tungsten oxide nanoparticles, which are less than 50 nm, on the needles of the modified sepiolite.

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