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Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/57495

Title: Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals
Authors: Meng, Xuan Browse this author
Shibayama, Tamaki Browse this author →KAKEN DB
Yu, Ruixuan Browse this author
Takayanagi, Shinya Browse this author
Watanabe, Seiichi Browse this author
Keywords: Ion irradiation
Surface nanostructuring
Al2O3 substrates
Ag–Au alloy
Localized surface plasmon resonance
Issue Date: 1-Nov-2013
Publisher: Elsevier
Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 314
Start Page: 112
End Page: 116
Publisher DOI: 10.1016/j.nimb.2013.05.036
Abstract: Effects of Ar-ion induced surface nanostructuring were studied using 100 keV Ar-ion irradiation of 30 nm Ag–Au bimetallic films deposited on Al2O3 single crystals, under irradiation fluences ranging from 5.0 1015 cm 2 to 6.3 1016 cm 2. Scanning electron microscope was used to study the ion-beaminduced surface nanostructuring. As the irradiation fluence increased, dewetting of the bimetallic films on the Al2O3 substrate was observed, and formation of isolated Ag–Au nanostructures sustained on the substrate were obtained. Next, thermal annealing was performed under high vacuum at 1073 K for 2 h; a layer of photosensitive Ag–Au alloy nanoballs partially embedded in the Al2O3 substrate was obtained when higher fluence irradiation (>3.8 1016 cm 2) was used. The microstructures of the nanoballs were investigated using a transmission electron microscope, and the nanoballs were found to be single crystals with a FCC structure. In addition, photoabsorption spectra were measured, and localized surface plasmon resonance peaks were observed. With increase in the irradiation fluence, the size of the Ag–Au nanoballs on the substrate decreased, and a blue-shift of the LSPR peaks was observed. Further control of the LSPR frequency over a wide range was achieved by modifying the chemical components, and a red-shift of the LSPR peaks was observed as the Au concentration increased. In summary, ion irradiation is an effective approach toward surface nanostructuring, and the nanocomposites obtained have potential applications in optical devices.
Type: article (author version)
URI: http://hdl.handle.net/2115/57495
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 柴山 環樹

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