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Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
Published on: July 22, 2013
An electrospinning deposited cobalt oxide nanofiber gas sensing device: selective enhancement as a thermal electronic
Dang Thi Thanh Le1,2, Vu Anh Tuan1,2, Matteo Tonezzer3,4
1Faculty of Electronic Materials and Devices, School of Materials Science and Engineering (SMSE), Hanoi University of Science and Technology (HUST) No. 1, Dai Co Viet Str. Hanoi 100000 Vietnam.
Abstract:
Cobalt oxide nanofibers (Co3O4 NFs) were synthesized using a two-step procedure involving electrospinning followed by calcination. The microstructural, morphological, and elemental properties of the nanofibers were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy-dispersive spectrometry (EDS). The Co3O4 NFs exhibited high structural integrity, chemical purity, and uniform diameters ranging from 20 to 50 nm. Thermal treatment at 600 °C for 3 hours transformed the electrospun fibers into elongated nanofibers composed of interconnected Co3O4 nanoparticles. The gas sensing properties of the Co3O4 NFs were evaluated for ethanol (C2H5OH) detection over a temperature range of 250 to 450 °C. The sensor demonstrated a significant response to ethanol, highlighting their potential for gas sensing applications. When employed as a thermal electronic nose, the device achieved perfect classification (100% accuracy) for six tested gases and demonstrated effective concentration estimation, with an average error of 28.6%.
