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Synthesis, Characterization and Sensing Behavior of WO₃ Nanocrystalline Powder for Toluene Vapor

100%
Boran F., Çetinkaya S.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
572-573
EN
Tungsten oxide (WO₃) nanocrystalline powder was successfully synthesized by direct precipitation technique starting from sodium tungstate dehydrate (Na₂WO₄·2H₂O) as precursor at 80°C for 48 h. The morphological characteristics, distribution, and crystallite size of WO₃ nanocrystalline powder were analysed by transmission electron microscopy, X-ray diffraction, and the Fourier transform infrared spectroscopy. According to transmission electron microscopy results, the mean particle size of WO₃ nanocrystalline powder was approximately determined as 41.7 nm. The gas sensing performance of WO₃ nanocrystalline powder for saturated toluene vapor was measured by two probe resistivity unit in a closed vessel at room temperature. In addition, WO₃ nanocrystalline powder was able to respond the lowest concentration of 500 ppm. The results showed that the sample exhibited high sensitivity (93%) and good response reproducibility (0.93+5.5%) for toluene vapor.
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Effect of Surfactant Types on the Size of Tin Oxide Nanoparticles

81%
Boran F., Çetinkaya S., Şahin M.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
546-548
EN
In this study, tin oxide (SnO₂) nanoparticles were synthesized by hydrothermal method in the presence of hydrazine and ammonia by adding surfactant for 12 h in a Teflon autoclave at 100°C reaction temperature. Tin(II) chloride hydrate as an inorganic precursor, hexadecyl trimethyl ammonium bromide (CTAB), and tetrapropyl ammonium bromide (TPAB) as cationic, and sodium dodecyl sulfonate (SDS) as anionic surfactants were used. The results showed that the size and shape of nanoparticles depended on the surfactant types. The nanoparticles sizes between 17.5 and 19.7 nm were obtained by changing types of surfactants. Synthesized tin oxide nanoparticles were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and the Fourier transform infrared spectroscopy.
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