Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH₃ Gas Sensitivity at Room Temperature

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  • Lich Nguyen Q.
    School of Engineering Physics, Hanoi University of Science and Technology
  • Thanh Tran P.
    School of Engineering Physics, Hanoi University of Science and Technology
  • Truong Duong V.
    Hanoi University of Industry
  • Kien Pham T.
    Advanced Institute of Science & Technology, Hanoi University of Science and Technology
  • Tu Nguyen C.
    School of Engineering Physics, Hanoi University of Science and Technology
  • Bac Luong H.
    School of Engineering Physics, Hanoi University of Science and Technology
  • Vuong Dang D.
    School of Engineering Physics, Hanoi University of Science and Technology
  • Chien Nguyen D.
    School of Engineering Physics, Hanoi University of Science and Technology Advanced Institute of Science & Technology, Hanoi University of Science and Technology
  • Lam Nguyen H.
    School of Engineering Physics, Hanoi University of Science and Technology Advanced Institute of Science & Technology, Hanoi University of Science and Technology

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  • Pt- and Ag-Decorated Carbon Nanotube Network Layers for Enhanced NH<sub>3</sub> Gas Sensitivity at Room Temperature

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Multi-walled carbon nanotubes (CNTs) were directly grown on alumina substrates patterned with Pt interdigitated electrodes by chemical vapor deposition method to fabricate gas sensor. Pt and Ag thin layers with nominal thicknesses of 2 and 4 nm were coated on the CNT layer by evaporation method to modify the CNT properties. The gas sensing results showed that the CNT/Pt- and CNT/Ag-based sensors exhibited enhanced sensitivity to NH3 gas at room temperature. The responses of the CNT/Pt (3.0%) and CNT/Ag (6.9%) sensors with a 4 nm thick metallic layer to 70 ppm NH3 were higher than that of pristine CNT sensor (1.5%).

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