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    • Comparative study on the gas-sensing performance of ZnO/SnO2 external and ZnO–SnO2 internal heterojunctions for ppb H2S and NO2 gases detection
    Authors: Phan, Hong Phuoc;  Advisor: Nguyen, Ngoc Viet; Le, Viet Thong; Chu, Manh Hung; Nguyen, Duc Hoa; Nguyen, Van Duy; Hoang, Si Hong; Nguyen, Van Hieu;  Co-Author: - (2021)

    The design of hetero-nanojunctions can greatly amplify the gas-sensing performance of conventional metal oxide gas sensors. In this study, the composite nanofibers (NFs) of ZnO–SnO2 internal heterojunctions (HJs) and the mixed NFs of ZnO/SnO2 external HJs were realized by using the electrospinning technique. Then, the gas-sensing characteristics of the as-synthesized NFs toward H2S and NO2 gases were systematically investigated and compared. The effects of the internal and external nanojunctions of the hetero-NF-based gas sensors were also explored. Results showed that the ZnO–SnO2 composite NFs demonstrate a higher response than those of the ZnO/SnO2 mixed NFs, as well as bare ZnO an...
    • Significantly enhanced NO2 gas-sensing performance of nanojunction-networked SnO2 nanowires by pulsed UV-radiation
    Authors: Nguyen, Manh Hung;  Advisor: Chu, Manh Hung; Nguyen, Van Duy; Nguyen, Duc Hoa; Hoang, Si Hong; Tran, Khoa Dang; Nguyen, Ngoc Viet; Le, Viet Thong; Phan, Hong Phuoc; Nguyen, Van Hieu;  Co-Author: - (2021)

    A unique combination of high response and fast response-recovery is still a challenge in the development of room-temperature gas sensors. Herein, we demonstrated the on-chip growth of nanojunction-networked SnO2 NW sensors to work under UV-radiation at room temperature. The morphological, compositional, and structural properties of synthesized SnO2 nanowires were examined using field emission electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy, respectively. The results presented the SnO2 NWs with smooth surfaces were entangled between the Pt electrode. Besides, the internal properties showed the SnO2 NWs were cr...