Title: Conversion oil Potassium Titanate Nanowires into Titanium Oxynitride Nanotubes
Authors: Wei, Yen-Ju
Peng, Chih-Wei
Cheng, Ta-Ming
Lin, Huang-Kai
Chen, Yu-Liang
Lee, Chi-Young
Chiu, Hsin-Tien
Department of Applied Chemistry
Keywords: potassium titanate;titanium oxynitride;nanowire;nanotube
Issue Date: 1-Oct-2011
Abstract: Tunnel-structured potassium titanate with a K(3)Ti(8)O(17) phase was synthesized by direct oxidation of titanium powder mixed with KF(aq) in water vapor at 923 K. The reaction conditions were adjusted so that uniform single crystalline potassium titanate nanowires with [010] growth direction (length: 5-30 mu m, diameter: 80-100 nm) were obtained. Nitridation of the nanowires by NH(3)(g) at 973-1073 K converted the titartate nanowires into rock-salt structured cubic phase single crystalline titanium oxynitride TiN(x)O(y) nanotubes (x = 0.88, y = 0.12, length = 1-10 mu m, diameter = 150-250 nm, wall thickness = 30 - 50 nm) and nanorods (x = 0.5, y = 0.5, length 1-5 mu m, diameter = 100-200 nm) with rough surfaces and [200] growth direction. The overall conversion of the titanate nanowires into the nanotubes and the nanorods can be rationalized by Ostwald ripening mechanism. We fabricated an electrode by adhering TiN(x)O(y) nanotubes (0.2 mg) on a screen-printed carbon electrode (geometric area: 0.2 cm(2)). Electrochemical impedance spectroscopy demonstrated its charge transfer resistance to be 20 Omega. The electrochemical surface area of the nanotubes on the electrode was characterized by cyclic voltammetry to be 0.32 cm(2). This property suggests that the TiN(x)O(y) nanostructures can be employed as potential electrode materials for electrochemical applications.
URI: http://dx.doi.org/10.1021/am201151t
ISSN: 1944-8244
DOI: 10.1021/am201151t
Volume: 3
Issue: 10
Begin Page: 3804
End Page: 3812
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