Nanostructured Fe₂O₃ Thick Film as an Ethanol Sensor

Abstract

Abstract-Thick films of AR Grade nano Fe 2 O 3 material with n-type semiconducting properties were prepared and tested for their gas sensing performances. Thick films of the materials were prepared by screen printing technique. The gas sensing performance was studied using static gas sensing system.

The ethanol sensors made from α-Fe₂O₃ decorated with multiwall carbon nanotubes

“…The response more than 300 was detected at the working body temperature 300°С. These results are much better in comparison results obtained for sensors made on nanostructured Fe 2 O 3 (Pawar et al 2012). The response and recovery times for the sensor made from α-Fe 2 O 3 /MWCNTs (25:1) were found to be 2 min and 8 s at 300°С.…”

“…Pure α-Fe 2 O 3 is quite inert material, it weakly interact with gases. But, in particular, thin and thick films made of α-Fe 2 O 3 doped with different impurities or catalytic metal particles are rather sensitive to alcohol vapors (Tan et al 2000, Ivanovskaya et al 2003, Neri et al 2005, Pawar et al 2012. A correct choice of impurities doped leads to not only to an improvement in the response to a target gas, other important parameters like the long-term stability, operation speed etc.…”

Co: Fe2O3, CoxZn1-xFe2O4 Thin Films Grown by Chemical Spray Pyrolysis for Gas Sensor Application

“…In the Co x Zn 1 -xFe 2 O 4 compound, the peak of the Raman shift peaks belonging to the hematite phase falls (Figure 2). In addition, the peaks showing the ramping changes of the stretching vibration mode of the Co x Zn 1-x Fe 2 O 4 film is due to the presence of multiple phases due to polycrystalline crystal structure and also impurity, oxygen vacancies, interstitial ion [7][8][9][10][11] (Table 4). In Figure 3the value of the energy of the band gap is calculated to be 2.10 eV, 2.12 eV with the fit drawn on the energy graph against the (αhυ) In Figure4athe magnetic hysteresis curve of the Co:Fe 2 O 3 thin film is observed to be relatively narrow.…”

CVD Deposited Titania Thin Films for Gas Sensors with Improved Operating Characteristics

“…It should be highlighted that all sensor structures manufactured with the use of CVD‐produced titania thin films were characterized by relatively low operating temperatures (within the range 170–300 °C) compared to thick film sensors usually operating at temperatures 350–400 °C . The temperature dependence of the response value of the sample with the highest degree of crystallinity is characterized by a curve with a narrow maximum at T = 200 °C.…”