Poster Title

The Heterostructure of the Langmuir-Blodgett assembled TiO2 Nanotubearray/Graphene Oxide for A Visible Light Responsibility

Grade Level at Time of Presentation

Senior

Institution

Western Kentucky University

KY House District #

720 Patton Way

KY Senate District #

1906 College Heights Blvd

Department

Chemistry

Abstract

The Heterostructure of the Langmuir-Blodgett assembled TiO2 Nanotubearray/Graphene Oxide for A Visible Light Responsibility

Xinju Dong, Logan B. Parker, Ying Chen, Hongyan Gao, Yan Cao*

Institute for Combustion Science and Environmental Technology, Department of Chemistry, Western Kentucky University, Bowling Green, KY 42101

ABSTRACT

Benjamin Franklin discovered monolayer films on the surface of a liquid, which is followed by two other scientists, Dr. Irving Langmuir and Dr. Katharine Blodgett, who greatly made a development of the Langmuir–Blodgett (LB) assemble film method. This study presented, in the first time, the preparation for a hetero-structure of the GO-coverage TiO2 nanotube arrays (TNA)-GO using the Langmuir-Blodgett (LB) assembly method. The highly ordered TNA nano-structure was synthesized using the anodic oxidation method. The GO was synthesized using the modified Hummer method. The GO coverage on TNA-GO, in a larger dimension and uniform, was light-penetrable to make underneath TNA receivable to light. TNA-GO has a red shift of 0.2eV and more longer wavelength sunlight can be used to apply into photocatalyst. The photocurrent density was found to be 32 μAcm-2 for the TNA-GO electrode, comparing with 12μAcm-2 of TNA only. The formation of the Schottky junction between TNA-GO likely made the recombination rate of the photogenerated electron-hole pairs being decreased significantly, and consequently enhancing the photocurrent. Also, the resistance of TNA-GO decreased especially under irradiation condition. Meanwhile, the coverage of GO on TNA improved the hydrophilicity of TNA-GO, facilitating aqueous chemical reactions with good kinetics. The synthesized TNA-GO material is inexpensive, nontoxic and highly photocatalytically active thus promising for various photocatalytic applications.

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The Heterostructure of the Langmuir-Blodgett assembled TiO2 Nanotubearray/Graphene Oxide for A Visible Light Responsibility

The Heterostructure of the Langmuir-Blodgett assembled TiO2 Nanotubearray/Graphene Oxide for A Visible Light Responsibility

Xinju Dong, Logan B. Parker, Ying Chen, Hongyan Gao, Yan Cao*

Institute for Combustion Science and Environmental Technology, Department of Chemistry, Western Kentucky University, Bowling Green, KY 42101

ABSTRACT

Benjamin Franklin discovered monolayer films on the surface of a liquid, which is followed by two other scientists, Dr. Irving Langmuir and Dr. Katharine Blodgett, who greatly made a development of the Langmuir–Blodgett (LB) assemble film method. This study presented, in the first time, the preparation for a hetero-structure of the GO-coverage TiO2 nanotube arrays (TNA)-GO using the Langmuir-Blodgett (LB) assembly method. The highly ordered TNA nano-structure was synthesized using the anodic oxidation method. The GO was synthesized using the modified Hummer method. The GO coverage on TNA-GO, in a larger dimension and uniform, was light-penetrable to make underneath TNA receivable to light. TNA-GO has a red shift of 0.2eV and more longer wavelength sunlight can be used to apply into photocatalyst. The photocurrent density was found to be 32 μAcm-2 for the TNA-GO electrode, comparing with 12μAcm-2 of TNA only. The formation of the Schottky junction between TNA-GO likely made the recombination rate of the photogenerated electron-hole pairs being decreased significantly, and consequently enhancing the photocurrent. Also, the resistance of TNA-GO decreased especially under irradiation condition. Meanwhile, the coverage of GO on TNA improved the hydrophilicity of TNA-GO, facilitating aqueous chemical reactions with good kinetics. The synthesized TNA-GO material is inexpensive, nontoxic and highly photocatalytically active thus promising for various photocatalytic applications.