Effects of TiCl 4 surface treatment on photoelectrochemical response of TiO 2 nanotube arrays

Jeong Hyun Park; Jae Hong Kim; Hyunsoo Kim; Chel Jong Choi; Kwang Soon Ahn

doi:10.1080/15421406.2012.711738

Effects of TiCl ₄ surface treatment on photoelectrochemical response of TiO ₂ nanotube arrays

Jeong Hyun Park
, Jae Hong Kim
, Hyunsoo Kim
, Chel Jong Choi
, Kwang Soon Ahn^*

^*Corresponding author for this work

Department of Semiconductor Science and Technology

Yeungnam University

Research output: Contribution to journal › Journal article › peer-review

Abstract

TiO ₂ nanotube arrays were fabricated using electrochemical anodization process and post-treated by varying the concentration of the TiCl ₄ aquous solution (5 to 50mM) for the surface treatment. Those photoelectrochemical (PEC) performances were significantly influenced by the TiCl ₄ concentration. The 20mM TiCl ₄-treated TiO ₂ nanotubes exhibited significantly enhanced PEC response, due to efficient passivation of the surface recombination traps. However, as the TiCl ₄ concentration increased further to 50mM, its PEC performance was reduced back, despite higher surface area. It can be attributed to the blocked voids caused by the formation of the TiO ₂ nanoparticles between the TiO ₂ nanotubes, because it leads to the hindered ion transport.

Original language	English
Pages (from-to)	192-197
Number of pages	6
Journal	Molecular Crystals and Liquid Crystals
Volume	568
Issue number	1
DOIs	https://doi.org/10.1080/15421406.2012.711738
State	Published - 2012.12.3

Keywords

photoelectrochemical response
surface recombination trap
TiCl surface treatment
TiO nanotube

Quacquarelli Symonds(QS) Subject Topics

Materials Science
Chemistry
Physics & Astronomy

Access to Document

10.1080/15421406.2012.711738

Cite this

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title = "Effects of TiCl 4 surface treatment on photoelectrochemical response of TiO 2 nanotube arrays",

abstract = "TiO 2 nanotube arrays were fabricated using electrochemical anodization process and post-treated by varying the concentration of the TiCl 4 aquous solution (5 to 50mM) for the surface treatment. Those photoelectrochemical (PEC) performances were significantly influenced by the TiCl 4 concentration. The 20mM TiCl 4-treated TiO 2 nanotubes exhibited significantly enhanced PEC response, due to efficient passivation of the surface recombination traps. However, as the TiCl 4 concentration increased further to 50mM, its PEC performance was reduced back, despite higher surface area. It can be attributed to the blocked voids caused by the formation of the TiO 2 nanoparticles between the TiO 2 nanotubes, because it leads to the hindered ion transport.",

keywords = "photoelectrochemical response, surface recombination trap, TiCl surface treatment, TiO nanotube",

author = "Park, \{Jeong Hyun\} and Kim, \{Jae Hong\} and Hyunsoo Kim and Choi, \{Chel Jong\} and Ahn, \{Kwang Soon\}",

year = "2012",

month = dec,

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doi = "10.1080/15421406.2012.711738",

language = "English",

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journal = "Molecular Crystals and Liquid Crystals",

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T1 - Effects of TiCl 4 surface treatment on photoelectrochemical response of TiO 2 nanotube arrays

AU - Park, Jeong Hyun

AU - Kim, Jae Hong

AU - Kim, Hyunsoo

AU - Choi, Chel Jong

AU - Ahn, Kwang Soon

PY - 2012/12/3

Y1 - 2012/12/3

N2 - TiO 2 nanotube arrays were fabricated using electrochemical anodization process and post-treated by varying the concentration of the TiCl 4 aquous solution (5 to 50mM) for the surface treatment. Those photoelectrochemical (PEC) performances were significantly influenced by the TiCl 4 concentration. The 20mM TiCl 4-treated TiO 2 nanotubes exhibited significantly enhanced PEC response, due to efficient passivation of the surface recombination traps. However, as the TiCl 4 concentration increased further to 50mM, its PEC performance was reduced back, despite higher surface area. It can be attributed to the blocked voids caused by the formation of the TiO 2 nanoparticles between the TiO 2 nanotubes, because it leads to the hindered ion transport.

AB - TiO 2 nanotube arrays were fabricated using electrochemical anodization process and post-treated by varying the concentration of the TiCl 4 aquous solution (5 to 50mM) for the surface treatment. Those photoelectrochemical (PEC) performances were significantly influenced by the TiCl 4 concentration. The 20mM TiCl 4-treated TiO 2 nanotubes exhibited significantly enhanced PEC response, due to efficient passivation of the surface recombination traps. However, as the TiCl 4 concentration increased further to 50mM, its PEC performance was reduced back, despite higher surface area. It can be attributed to the blocked voids caused by the formation of the TiO 2 nanoparticles between the TiO 2 nanotubes, because it leads to the hindered ion transport.

KW - photoelectrochemical response

KW - surface recombination trap

KW - TiCl surface treatment

KW - TiO nanotube

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DO - 10.1080/15421406.2012.711738

M3 - Journal article

AN - SCOPUS:84867317549

SN - 1542-1406

VL - 568

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EP - 197

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

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