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The NO₂ Sensing Properties of the Sensors Done with Nano-Tetrapods

100%
Tulun F., Öztürk S., Öztürk Z.
Acta Physica Polonica A
|
2016
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vol. 129
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issue 4
797-799
EN
In this work we have studied the NO2 sensing properties of the sensors with tetrapods. The tetrapods that were used in the production were obtained by CVD route, and their structural analysis was carried out using SEM, XRD and EDX methods. The sensors were produced by a different method that the one mentioned in our another work, and additional electrical I-V characterization was carried out. As well as in the previous work the sensors were tested for 50 ppm sensitivity, by using computer controlled gas flux system, in NO₂ at 200°C, and in ambient air to model the normal working conditions more closely. It was found that the sensors have a good sensitivity to the NO₂ gas. All of the sensors showed a great reversibility and it was found that the recovery time was perfectly low. After this experiment the same sensors were tested with other different gases for several times. And no other problems in sensing ability were seen.
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Structural and Optical Characterization of TiO_2 Thin Films Prepared by Sol-Gel Process

88%
Karabay I., Aydın Yüksel S., Ongül F., Öztürk S., Aslı M.
Acta Physica Polonica A
|
2012
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vol. 121
|
issue 1
265-267
EN
Titanium dioxide (TiO_2) thin films were prepared by spin coating technique of sol precursor on Corning 7059 glass substrates. Spectral transmittances of as deposited and annealed samples were measured in the range of 250 to 1100 nm. Optical band gaps were calculated from the Tauc plots and was found to be about 3.78 eV for the annealed samples at 500°C. X-ray diffraction patterns were performed with as deposited and annealed samples. By annealing the samples at 500C in various annealing times, the structure has changed from amorphous to the anatase crystalline state. Variations of the band gap energy values of TiO_2 films with cobalt doping were also investigated. Cobalt doping decreased the band gap value of TiO_2 films down to 3.25 eV. X-ray diffraction patterns were also given for the doped samples.
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