Synthesis of Titanate-Based Nanotubes for One-Dimensionally Confined Electrical Properties Wanbiao Hu Liping Li Guangshe Li Jian Meng Wenming Tong 10.1021/jp907001n.s001 https://acs.figshare.com/articles/journal_contribution/Synthesis_of_Titanate_Based_Nanotubes_for_One_Dimensionally_Confined_Electrical_Properties/2824915 Structural tailoring for dimensionally confined electrical properties is fundamentally important for nanodevices and the relevant technologies. Titanate-based nanotubes were taken as a prototype one-dimensional material to study. First, Na<sub>0.96</sub>H<sub>1.04</sub>Ti<sub>3</sub>O<sub>7</sub>·3.42H<sub>2</sub>O nanotubes were prepared by a simple hydrothermal condition, which converted into Na<sub>0.036</sub>H<sub>1.964</sub>Ti<sub>3</sub>O<sub>7</sub>·3.52H<sub>2</sub>O nanotubes by a subsequent acidic rinsing. Systematic sample characterization using combined techniques of X-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy, electron paramagnetic resonance, Fourier transform infrared spectroscopy, elemental analyses, and alternative current impedance indicated that both nanotubes possessed a scrolled trititanate-type structure with the (200) crystal face predominant on the tube surface. With increasing temperature, both nanotubes underwent a continuous dehydration process, which however imposed different impacts on the structures and electrical properties, depending on the types of the nanotubes: (1) the Na<sub>0.036</sub>H<sub>1.964</sub>Ti<sub>3</sub>O<sub>7</sub>·3.52H<sub>2</sub>O nanotube converted into anatase-type structure TiO<sub>2</sub> nanotubes, while the Na<sub>0.96</sub>H<sub>1.04</sub>Ti<sub>3</sub>O<sub>7</sub>·3.42H<sub>2</sub>O nanotube kept the trititanate-type tube structure after calcination at 300 °C; (2) both nanotubes exhibited a maximum conductivity at high temperatures, in which Na<sub>0.96</sub>H<sub>1.04</sub>Ti<sub>3</sub>O<sub>7</sub>·3.42H<sub>2</sub>O nanotubes are relatively highly conductive, showing a grain conductivity approximately 2 orders of magnitude larger than that of Na<sub>0.036</sub>H<sub>1.964</sub>Ti<sub>3</sub>O<sub>7</sub>·3.52H<sub>2</sub>O nanotubes. These observations were interpreted in terms of the defect chemistry, hydration, and the triple conductive species that were confined in the one-dimensional nanostructures. The findings reported in this work may pave the way for titanate-based nanotubes to find a broad class of technological uses for nanodevices. 2009-10-01 00:00:00 tube surface 2 orders grain conductivity Systematic sample characterization acidic rinsing hydrothermal condition field emission scanning electron microscopy resolution transmission electron microscopy Na 0.036H nanotube Na 0.96H nanotubes defect chemistry dehydration process Na 0.036H nanotubes conductive species Na 0.96H nanotube