Synthesis and electrical properties of Na2Ti3O7 nanoribbons

Electrical properties of Na₂Ti₃O₇ nanoribbons (NRs) sensitively depend on their structures, morphologies and sizes. The nanofield-effect transistors based on single NR are fabricated to evaluate the electronic transport characteristics. A convenient hydrothermal method is employed to synthesise the NRs, and the characterisations of morphology and crystal structure reveal that the NRs have the good crystallinity and uniformity with the width of 200-400-nm, the length -10--m and the growth direction of [001]. The atomic ratio of Na:Ti:O is estimated to be 2:3:7 from the energy-dispersive X-ray spectroscopy spectrum. The electronic characterisations demonstrate that the as-synthesised Na₂Ti₃O₇ NRs have a lower electronic resistivity of 14 cm, substantial p-type conductivity with a high mobility of 55.6 cm² V^-1 S^-1 and carrier concentration of 8.1×10¹⁵ cm^-3. The high aspect ratio and good crystallinity result in the high mobility. The Na₂Ti₃O₇ NRs with good p-type conductivity may have important potential applications in nanoelectronic devices.