@article{Hassan2020, 
author = {Ehssan Salah Hassan and Kameran Yasseen Qader and Esraa Hassn Hadi and Sami Salman Chiad and Nadir Fadhil Habubi and Khalid Haneen Abass},
title = {Sensitivity of Nanostructured Mn-Doped Cobalt Oxide Films for Gas Sensor Application},
year = {2020},
journal = {Nano Biomedicine and Engineering},
volume = {12},
number = {3},
pages = {205-213},
keywords = {Manganese, Cobalt oxide, SPT, Crystalite size, Columnar rod, Gas sensor},
url = {https://www.sciopen.com/article/10.5101/nbe.v12i3.p205-213},
doi = {10.5101/nbe.v12i3.p205-213},
abstract = {The effect of manganese doped cobalt oxide (Co3O4:Mn) was investigated by two different ratios (1% and 3%), which were precipitated by spray pyrolysis technique (SPT), and was adopted using a laboratory designed glass atomizer. Glass substrates were used to deposit films on them, heated at a temperature of 420 ℃. The structural properties were studied through X-ray diffraction. The results showed that all deposit nanostructured films were polycrystalline and there was a decrease in the preferred reflection intensity along (311) plane resulting in a decrease in the crystallite size. Surface properties were analyzed through atomic force microscopy (AFM), which showed a decrease in the roughness and the particle size growth was a vertical columnar rod. The optical characterization displayed that the transmittance of pure Co3O4 nanostructured films was 48% and decreased to 35% for 1% of the Mn concentration, and continued to decrease to 33% with the increase of manganese concentration up to 3%. Optical energy bandgap of pure Co3O4 nanostructured films was 1.435 eV and decreased to 1.419 eV for 1% of Mn concentration, and continued to decrease to 1.367 eV with the increase of Mn concentration up to 3%. The highest percentage sensitivity was for the sample doped with 3% Mn, which was about 65%, for NO2 gas concentration of 600 ppm, at an operating temperature of 200 ℃.}
}