Abstract
The pure CuO nanofibers were synthesized via the electrospinning method successfully. The calcinated CuO nanofibers were investigated for sensing hydrogen and carbon monoxide gases. Structural properties of the synthesized calcinated nanofibers were studied using Fourier -transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX), and particle morphology by scanning electron microscopy (SEM). SEM images confirmed string-like structures, nanofibers. The sensor based on the calcinated CuO nanofibers exhibited excellent gas sensing performance at the low operating temperature of 175 °C and the fast response and recovery characteristics at a low concentration. Moreover, good stability, prominent reproducibility, and excellent selectivity are also observed based on the calcinated nanofibers. These results demonstrate the potential application of calcinated CuO nanofibers for sensing hydrogen (10-200 ppm) and carbon monoxide (400-700 ppm) gases.
Highlights
Metal oxide semiconductor (MOS) gas sensors have gained special focus driven by their diverse applications in air quality detection, inflammable gas inspection, environmental monitoring, healthcare, defense, security, and so on.[1]
We reported a simple and facile approach to fabricate high quality calcinated CuO nanofibers by electrospinning and their H2 and CO sensing characteristics are investigated
Scanning electron microscopy (SEM) calcinated nanofibers images were performed on an LEO 1450 VP (Germany) instrument, Energy Dispersive X-ray spectroscopy (EDX) was attained on a TESCAN S8000 microscope, Atomic Absorption Spectrometer (AAS) of calcinated nanofibers were performed on an Agilent 240 AA instrument and Spin coating Device (Institute for Research and Technology Development of Modern Industry, Made in Iran) was a used to deposit uniform thin films onto flat glass
Summary
Metal oxide semiconductor (MOS) gas sensors have gained special focus driven by their diverse applications in air quality detection, inflammable gas inspection, environmental monitoring, healthcare, defense, security, and so on.[1]. Preparation of sol with suitable inorganic precursor and polymer content and achieving the right rheology for electrospinning, (2) Spinning of the solution to obtain fibers of polymer/inorganic composite, (3) Calcination of the composite fibers to obtain final oxide fibers It is important; to control all of the above three stages to obtain high quality fibers with the desired final properties.[10] It has the merits of simplicity, high efficiency, low cost, and high reproducibility.[11] In the other hand, many studies have reported on H2 and CO gases sensing. The selectivity defined as the response ratio of target gas to that of another gas is used to assess the relative performance of Semiconducting metal oxides (MOXs) sensors towards different gases.[37] In this paper the sensitivity (S) was defined as S = Rg/Ra. A possible sensing mechanism is described as follows to discover the gas sensing reaction process of the CuO sensor against H2 and CO gases and illustrate the enhanced H2 and CO sensing properties of the calcinated CuO nanofibers. H2 and CO sensing mechanisms of the MOS can be explained from the following reaction paths:[41]
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