Biotemplated Synthesis of Hollow Double-Layered Core/Shell Titania/Silica Nanotubes under Ambient Conditions

Authors

  • Dong Li,

    1. Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, USA
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  • Bijo Mathew,

    1. Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, USA
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  • Chuanbin Mao

    Corresponding author
    1. Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, USA
    • Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, USA.
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Abstract

Bacterial flagella, protein nanotubes (∼15 nm wide) detached from Salmonella typhimurium bacteria, are used to template the formation of titania/silica core/shell double-layered nanotubes in aqueous solution under ambient conditions through a sol–gel process. The thickness of each layer is tunable by varying the concentration of precursor solutions or reaction times. Upon heating, the flagella can be removed and the inner titania layer can be transformed into a nanocrystalline layer supported by the outer silica sheath. Nanotubes with different inner pore diameters and morphologies could be templated by other bionanofibers such as M13 phage and bacterial pili. This work shows that bionanofibers can be used as a universal biotemplate for the green synthesis of nanotubes with tunable wall thicknesses.

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