Barrier-oxide layer engineering of TiO2 nanotube arrays to get singleand multi-stage Y-branched nanotubes: Effect of voltage ramping and electrolyte conductivity

Title
Barrier-oxide layer engineering of TiO2 nanotube arrays to get singleand multi-stage Y-branched nanotubes: Effect of voltage ramping and electrolyte conductivity
Author(s)
주상우아니타바너지나라얀민봉기
Keywords
SENSITIZED SOLAR-CELLS; TITANIA NANOTUBES; 2-STEP ANODIZATION; GROWTH; FABRICATION; MORPHOLOGY; EFFICIENCY; ALUMINUM; NANORODS
Issue Date
201505
Publisher
ELSEVIER SCIENCE BV
Citation
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, v.195, pp.1 - 11
Abstract
Single and multi-stage Y-branched TiO2 nanotube arrays (TNAs) have been fabricated by a voltage ramping down process using potentiostatic two-step anodization in 0.5 wt% hydrofluoric acid (HF)/glycerol (1:2 volume ratio) electrolyte. Initially, the voltage is kept at 40V for 3 h and then it is ramped down to different voltages (e.g. 30V, 34V, 36V, 38V and 39V) at a ramping rate of either -1.0V s(-1) or -0.5V s(-1) in one time and two-time aged electrolytes. The growth mechanism of Y-branching of TNAs is modeled and explained in terms of unequal interfacial movements of the two interfaces across the barrier oxide layer (BOL) under non-steady-state growth regime. The 'pinched off area of the BOL at the nanotube propagation front can be controlled effectively with the relative ramping voltage levels and electrolyte's conductivity to obtain Y-branched TNAs. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/32430http://dx.doi.org/10.1016/j.mseb.2015.01.005
ISSN
0921-5107
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공과대학 > 기계공학부 > Articles
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