Preparation and Xylene‐Sensing Properties of Co₃O₄ Nanofibers

Abstract

Co 3 O 4 nanofibers were prepared by an electrospinning method and characterized by differential thermal and thermal gravimetric analyzer (DTA-TGA), X-ray diffraction (XRD), Fourier Transform Infrared Spectrometer (FT-IR), and scanning electron microscopy (SEM). Xylene-sensing properties of the as-prepared nanofibers were also investigated in detail. The results showed that the morphology of the as-prepared fibers was largely influenced by the calcination temperature. The Co 3 O 4 nanofibers calcined at 500°C exhibited the highest response to xylene in a wide concentration range. Moreover, Co 3 O 4 nanofibers calcined at 500°C also exhibited good selectivity, fast response (15 s) and recovery (22 s) rate at a low operating temperatures of 255°C. These properties make the fabricated nanofibers good candidates for xylene detection.

Facile synthesis of mesoporous hierarchical Co3O4–TiO2 p–n heterojunctions with greatly enhanced gas sensing performance

“…44 The gas response of the sensor to a reducing gas was defined as Rg/Ra for a p-type semiconductor, where Rg and Ra denote the resistances of the sensor in the analyte gas and in air, respectively. 45 The response and recovery times are defined as the time taken by sensors to achieve 90％ of the steady-state resistance changes in the case of adsorption and desorption of testing gas, respectively.…”

Low-Dimensional Nanostructures Based on Cobalt Oxide (Co3O4) in Chemical-Gas Sensing

“…The selective sensing of toluene in Cr incorporated sensors has been attributed to the synergetic effect of abundant adsorbed oxygen on Co3O4 surface and the catalytic action of Cr for partial oxidation of methyl groups in toluene into a more reactive chemical species for xylene detection. Yet, the fastest detection of xylene was reported for Co3O4 1D nano structures NFs by Qu et al in [67] with a response and a recovery time of 15 s and 22 s respectively. The reported faster response and recovery times have been attributed to the fast mass transfer of xylene molecules from and to the interaction area, together with the distribution of bimodal pore sizes [67].…”

“…Acetone is a VOCs known to be caused by irritation to nose, eyes, throat, and central nervous system as the concentration is higher than 173 ppm or if the exposure continues for several hours [60,72]. Moreover, it has been identified as a key compound to identify health issues in human body by analyzing the human breath [67,75]. Hence, the detection of acetone is essential for both society safety and health.…”

Au‐nanoparticle‐decorated SnO2 nanorod sensor with enhanced xylene‐sensing performance

“…Exposure to low concentrations of xylene for long durations may lead to severe health problems, mainly nervous damage. Inhaling large amounts of xylene can cause tinnitus, loss of consciousness, colon cancer, rectal cancer, and lung cancer . Thus, the detection and measurement of xylene are important.…”

“…Inhaling large amounts of xylene can cause tinnitus, loss of consciousness, colon cancer, rectal cancer, and lung cancer. 4,5 Thus, the detection and measurement of xylene are important. Hitherto, various methods, such as gas chromatography, 6 optical waveguides, 7 optical planar Bragg grating sensors, 8 chemical sensors, 9 biosensors, 10 and magneto-elastic sensors, 11 have been used to detect xylene.…”