Controlled morphology modulation of anodic TiO2 nanotubes via changing the composition of organic electrolytes

Literature Information

Publication Date 2014-04-17
DOI 10.1039/C4CP00816B
Impact Factor 3.676
Authors

Xuemin Li, Xuehua Zhang, Zishen Guan, Tao He


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Abstract

Titanium dioxide (TiO2) nanotubes are prepared by electrochemical anodization using Ti metal foils under a DC bias of 30 V for 20 h. The electrolyte is a mixture of formamide (FA) and ethylene glycol (EG), which contains NH4F (0.3 wt%) and H2O (2.0 v%). The diameter and wall thickness of the nanotubes decrease with the increase of EG content, while the length first decreases with the increase of EG content and then increases again. An O-ring-like pattern is formed on the outer surface of TiO2 nanotubes upon the introduction of FA into the EG electrolyte, upon which the surface becomes rougher and rougher with increasing FA content. This is caused by the breaking and re-establishment of a double layer at the interface. All of the observed phenomena are closely related to the conductivity and viscosity of the electrolyte as well as the formation of hydrogen bond in the system. The proposed mechanism is confirmed by introducing hydroxyl ions into the pure EG electrolyte.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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