Tungsten oxide multifunctional nanostructures: Enhanced environmental and sensing applications

2019 ◽  
Vol 221 ◽  
pp. 250-257 ◽  
Author(s):  
Muhammad Tahir Zahoor ◽  
Mashkoor Ahmad ◽  
Khan Maaz ◽  
Shafqat Karim ◽  
Khalid Waheed ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Sensing Applications ◽  
Multifunctional Nanostructures

scholarly journals Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3405 ◽  
Author(s):  
Lili Yang ◽  
Artem Marikutsa ◽  
Marina Rumyantseva ◽  
Elizaveta Konstantinova ◽  
Nikolay Khmelevsky ◽  
...  
Keyword(s):  
Particle Size ◽  
Nitrogen Oxides ◽  
Tungsten Oxide ◽  
High Sensitivity ◽  
Tungstic Acid ◽  
Drift Spectroscopy ◽  
Reaction Conditions ◽  
Sensing Applications ◽  
Sensor Signals

Tungsten oxide is a renowned material for resistive type gas sensors with high sensitivity to nitrogen oxides. Most studies have been focused on sensing applications of WO3 for the detection of NO2 and a sensing mechanism has been established. However, less is known about NO sensing routes. There is disagreement on whether NO is detected as an oxidizing or reducing gas, due to the ambivalent redox behavior of nitric oxide. In this work, nanocrystalline WO3 with different particle size was synthesized by aqueous deposition of tungstic acid and heat treatment. A high sensitivity to NO2 and NO and low cross-sensitivities to interfering gases were established by DC-resistance measurements of WO3 sensors. Both nitrogen oxides were detected as the oxidizing gases. Sensor signals increased with the decrease of WO3 particle size and had similar dependence on temperature and humidity. By means of in situ infrared (DRIFT) spectroscopy similar interaction routes of NO2 and NO with the surface of tungsten oxide were unveiled. Analysis of the effect of reaction conditions on sensor signals and infrared spectra led to the conclusion that the interaction of WO3 surface with NO was independent of gas-phase oxidation to NO2.

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.

Nanosize hexagonal tungsten oxide for gas sensing applications

2008 ◽  
Vol 28 (5) ◽  
pp. 913-917 ◽  
Author(s):  
Csaba Balázsi ◽  
Lisheng Wang ◽  
Esra Ozkan Zayim ◽  
Imre Miklós Szilágyi ◽  
Katarína Sedlacková ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Gas Sensing ◽  
Sensing Applications ◽  
Hexagonal Tungsten Oxide

High Temperature Phases of Nanostructured Tungsten Oxide for Gas Sensing Applications

2006 ◽  
Vol 915 ◽  
Author(s):  
Andrea Ponzoni ◽  
Elisabetta Comini ◽  
Matteo Ferroni ◽  
Guido Faglia ◽  
Giorgio Sberveglieri
Keyword(s):  
High Temperature ◽  
Tungsten Oxide ◽  
Phase Stability ◽  
Thermal Evaporation ◽  
Gas Sensing ◽  
Grain Coarsening ◽  
Crystallinity Degree ◽  
Sensing Applications ◽  
Different Temperatures ◽  
Annealing Effects

AbstractWO3 layers have been synthesized by thermal evaporation at high temperature in order to induce the crystallization of stable films. Phase stability has been proved by annealing treatments carried out at different temperatures. Annealing effects on gas sensing performances have been explained in terms of crystallinity degree and grain coarsening phenomena.

Direct laser deposition of nanostructured tungsten oxide for sensing applications

2016 ◽  
Vol 49 (20) ◽  
pp. 205101 ◽  
Author(s):  
Alexandra Palla-Papavlu ◽  
Mihaela Filipescu ◽  
Christof W Schneider ◽  
Stefan Antohe ◽  
Paolo M Ossi ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Laser Deposition ◽  
Direct Laser Deposition ◽  
Sensing Applications ◽  
Direct Laser

TEM INVESTIGATIONS ON CNT-ADDED HEXAGONAL WO3 FILMS FOR SENSING APPLICATIONS

NANO ◽  
2008 ◽  
Vol 03 (04) ◽  
pp. 223-227 ◽  
Author(s):  
KATARÍNA SEDLÁCKOVÁ ◽  
RADU IONESCU ◽  
CSABA BALÁZSI
Keyword(s):  
Carbon Nanotubes ◽  
Tungsten Oxide ◽  
Sodium Tungstate ◽  
Acidic Precipitation ◽  
Temperature Range ◽  
Sensing Applications ◽  
Hexagonal Tungsten Oxide ◽  
Tungstate Solution ◽  
Average Size ◽  
Hazardous Gas

In this work, nanocrystalline hexagonal tungsten oxide was prepared by acidic precipitation from sodium tungstate solution. TEM studies of nanopowders showed that the average size of the hexagonal nanoparticles is 30–50 nm. Novel nanocomposites were prepared by embedding a low amount of gold-decorated carbon nanotubes into the hex- WO 3 matrix. The addition of MWCNTs lowered the temperature range of sensitivity of hex- WO 3 nanocomposites to NO 2 hazardous gas. The sensitivity of hex- WO 3 with Au -decorated MWCNTs to NO 2 is at the temperature range between 25°C and 250°C.

Polycrystalline tungsten oxide nanofibers for gas-sensing applications

2011 ◽  
Vol 160 (1) ◽  
pp. 549-554 ◽  
Author(s):  
Tuan-Anh Nguyen ◽  
Sungyeol Park ◽  
Jun Beom Kim ◽  
Tae Kyu Kim ◽  
Gi Hun Seong ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Gas Sensing ◽  
Sensing Applications ◽  
Polycrystalline Tungsten

Synthesis of polyethylene glycol (PEG) assisted tungsten oxide (WO3) nanoparticles for l-dopa bio-sensing applications

Talanta ◽  
2011 ◽  
Vol 85 (4) ◽  
pp. 2166-2174 ◽  
Author(s):  
V. Hariharan ◽  
S. Radhakrishnan ◽  
M. Parthibavarman ◽  
R. Dhilipkumar ◽  
C. Sekar
Keyword(s):  
Polyethylene Glycol ◽  
Tungsten Oxide ◽  
Sensing Applications

Synthesis and Characterization of Chromium-Doped Mesoporous Tungsten Oxide for Gas Sensing Applications

2007 ◽  
Vol 17 (11) ◽  
pp. 1801-1806 ◽  
Author(s):  
E. Rossinyol ◽  
A. Prim ◽  
E. Pellicer ◽  
J. Arbiol ◽  
F. Hernández-Ramírez ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Gas Sensing ◽  
Synthesis And Characterization ◽  
Sensing Applications
Sign in / Sign up

Export Citation Format

Share Document