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Highly porous metal oxide polycrystalline nanowire films with superior performance in gas sensors

Journal Article


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Abstract


  • In this work, we report for the first time a simple two-step route to fabricate a novel porous metal oxide

    film composed of polycrystalline nanowires with ultra-small nanoparticles, good interconnectivity

    between nanoparticles, and a high density of ultra-fine nanopores. The as-prepared metal oxide films

    combine the advantages of small crystal size, high surface-to-volume ratio, and one-dimensionalnanowire-

    induced unique charge transport paths (with correspondingly high interconnectivity). Taking

    In2O3 as an example, porous In2O3 films, composed of polycrystalline In2O3 nanowires with ultra-small

    nanocrystals (less than 10 nm) and a high density of ultra-fine nanopores (1.6–3.1 nm), have shown very

    high sensitivity and good reproducibility towards ethanol gas, which are 10–20 times higher than for

    In2O3 octahedra and commercial SnO2 thick films. The response/recovery speeds of the as-prepared

    porous In2O3 films are also 5–6 times higher than for In2O3 octahedra, SnO2 nanobelts, and commercial

    SnO2 thick films. We believe that such metal oxide flexible films made from highly porous nanowires

    will replace their traditional thick film counterparts, not only in gas sensors but also in other functional

    devices, such as batteries, supercapacitors, solar cells, etc.

UOW Authors


  •   Liu, Jun (external author)
  •   Guo, Zaiping
  •   Zhu, Kaixing (external author)
  •   Wang, Wenjun (external author)
  •   Zhang, Chaofeng (external author)
  •   Chen, Xiaolong (external author)

Publication Date


  • 2011

Citation


  • Liu, J., Guo, Z., Zhu, K., Wang, W., Zhang, C. & Chen, X. (2011). Highly porous metal oxide polycrystalline nanowire films with superior performance in gas sensors. Journal of Materials Chemistry, 21 (30), 11412-11417.

Scopus Eid


  • 2-s2.0-79960741707

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2459&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/1415

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 11412

End Page


  • 11417

Volume


  • 21

Issue


  • 30

Place Of Publication


  • United Kingdom

Abstract


  • In this work, we report for the first time a simple two-step route to fabricate a novel porous metal oxide

    film composed of polycrystalline nanowires with ultra-small nanoparticles, good interconnectivity

    between nanoparticles, and a high density of ultra-fine nanopores. The as-prepared metal oxide films

    combine the advantages of small crystal size, high surface-to-volume ratio, and one-dimensionalnanowire-

    induced unique charge transport paths (with correspondingly high interconnectivity). Taking

    In2O3 as an example, porous In2O3 films, composed of polycrystalline In2O3 nanowires with ultra-small

    nanocrystals (less than 10 nm) and a high density of ultra-fine nanopores (1.6–3.1 nm), have shown very

    high sensitivity and good reproducibility towards ethanol gas, which are 10–20 times higher than for

    In2O3 octahedra and commercial SnO2 thick films. The response/recovery speeds of the as-prepared

    porous In2O3 films are also 5–6 times higher than for In2O3 octahedra, SnO2 nanobelts, and commercial

    SnO2 thick films. We believe that such metal oxide flexible films made from highly porous nanowires

    will replace their traditional thick film counterparts, not only in gas sensors but also in other functional

    devices, such as batteries, supercapacitors, solar cells, etc.

UOW Authors


  •   Liu, Jun (external author)
  •   Guo, Zaiping
  •   Zhu, Kaixing (external author)
  •   Wang, Wenjun (external author)
  •   Zhang, Chaofeng (external author)
  •   Chen, Xiaolong (external author)

Publication Date


  • 2011

Citation


  • Liu, J., Guo, Z., Zhu, K., Wang, W., Zhang, C. & Chen, X. (2011). Highly porous metal oxide polycrystalline nanowire films with superior performance in gas sensors. Journal of Materials Chemistry, 21 (30), 11412-11417.

Scopus Eid


  • 2-s2.0-79960741707

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2459&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/1415

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 11412

End Page


  • 11417

Volume


  • 21

Issue


  • 30

Place Of Publication


  • United Kingdom