With a TiO2-based photocatalytic approach, both an arbitrary geometry tailoring of single-walled carbon nanotubes (SWCNTs) on various substrates and the conversion of metallic to semiconducting SWCNTs are demonstrated. Taking advantage of the selectivity on the diameter and metallicity of SWCNTs, 100% depletable SWCNT-based field-effect transistors are achieved, with Ion/Ioff improvements up to five orders of magnitude.
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