Au NPs decorated TiO2 nanotubes array candidate for UV photodetectors |
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Authors: | Suttinart Noothongkaew Jin Kyu Han Young Bum Lee Orathai Thumthan Ki-Seok An |
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Affiliation: | Department of Physics, Faculty of Science, Ubon Ratchathani University, 34190, Thailand,Thin Film Materials Research Group, Korea Research Institute of Chemical Technology, Yuseong, Daejeon 305-600, Republic of Korea,Thin Film Materials Research Group, Korea Research Institute of Chemical Technology, Yuseong, Daejeon 305-600, Republic of Korea,Department of Physics, Faculty of Science, Ubon Ratchathani University, 34190, Thailand and Thin Film Materials Research Group, Korea Research Institute of Chemical Technology, Yuseong, Daejeon 305-600, Republic of Korea |
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Abstract: | This work reports the Au nanoparticles (NPs) deposited on TiO2 nanotubes (NTs) which were successfullysynthesized by a simple two-step anodization method. This fabrication process is notable for a simple and inexpensivemethod for obtaining pure TiO2 NTs and Au NPs deposited TiO2 NTs. The prepared samples werecharacterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), X-ray photoelectronspectroscopy (XPS), and I-V curve. We found that the size of Au NPs can be controlled by changing thebias voltage during the deposition. The photodetectors of Au NPs/TiO2 devices showed good wavelength selectivitywith high photocurrent as compared to pure TiO2 NTs devices. Subsequently, Au NPs deposited on TiO2NTs at bias voltage of 70 V was potentially used in fabrication of UV photodetector. At this applied voltage, ahigh density of Au NPs was uniformly deposited on TiO2 NTs. As a result, it enables a high photocurrent andgreat responsivity in UV region. It is suggested that the Au NPs deposited TiO2 NTs device shows good promisefor UV photodetectors with possibility to fine-tune properties in both UV and visible regions and is worthy offurther investigation. |
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Keywords: | Titanium oxideGold nanoparticlesUV photodetectors |
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