Templating Synthesis of SnO2 Nanotubes Loaded with Ag2O Nanoparticles and Their Enhanced Gas Sensing Properties

Authors

  • Xing Chen,

    1. Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China
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  • Zheng Guo,

    1. Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China
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  • Wei-Hong Xu,

    1. Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China
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  • Hong-Bin Yao,

    1. Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
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  • Min-Qiang Li,

    1. Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China
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  • Jin-Huai Liu,

    1. Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, P. R. China
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  • Xing-Jiu Huang,

    Corresponding author
    1. Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
    • Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
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  • Shu-Hong Yu

    Corresponding author
    1. Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
    • Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
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Abstract

A new kind of SnO2 nanotubes loaded with Ag2O nanoparticles can be synthesized by using Ag@C coaxial nanocables as sacrificial templates. The composition of silver in SnO2 nanotubes can be controlled by tuning the compositions of metallic Ag in Ag@C sacrificial templates, and the morphology of tubular structures can be changed by use of nanocables with different thicknesses of carbonaceous layer. This simple strategy is expected to be extended for the fabrication of similar metal-oxide doped nanotubes using different nanocable templates. In contrast to SnO2@Ag@C nanocables as well as to other types of SnO2 reported previously, the Ag2O-doped SnO2 nanotubes exhibit excellent gas sensing behaviors. The dynamic transients of the sensors demonstrated both their ultra-fast response (1–2 s) and ultra-fast recovery (2–4 s) towards ethanol, and response (1–4 s) and recovery (4–5 s) towards butanone. The combination of SnO2 tubular structure and catalytic activity of Ag2O dopants gives a very attractive sensing behavior for applications as real-time monitoring gas sensors with ultra-fast responding and recovering speed.

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