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    • Fabrication of p-Type Co3O4 Nanofiber Sensors for Ultra-Low H2S Gas Detection at Low Temperature
    Authors: Phuoc, Phan Hong;  Advisor: Hong, Le Thi; Thang, Nguyen Tat; Hanh, Nguyen Hong; Hung, Chu Manh; Duy, Nguyen Van; Hieu, Nguyen Van; Hoa, Nguyen Duc;  Co-Author: - (2021)

    In the current work, we report the on-chip fabrication of a low-temperature H2S sensor based on p-type Co3O4 nanofibers (NFs) using the electrospinning method. The FESEM images show the typical spider-net like morphologies of synthesized Co3O4 NFs with an average diameter of 90 nm formed on the comb-like electrodes. The EDX data indicate the presence of Co and O elements in the NFs. The XRD analysis results confirm the formation of single-phase cubic spinel nanocrystalline structures (Fd3 m) for the synthesized Co3O4 NFs. The Raman results are in agreement with the XRD data through the presence of five typical vibration modes of the nanocrystalline Co3O4. The gas sensing properties of the fabricated Co3O4 NF sensors are tested to 1 ppm H2S within a temperature range of 150 °C to 450...