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ID 114234
著者
Takahata, Toshihiko Tokushima University
Yoshitani, Yuki Tokushima University
キーワード
Titanium dioxide
Gold nanoparticle
Gold thin film
Optical extinction
Transient absorption spectroscopy
資料タイプ
学術雑誌論文
抄録
We proposed metal-insulator (MI) and metal-insulator-metal (MIM) structures of titanium dioxide (TiO2) sandwiched by gold nanoparticles (AuNPs) layer and gold sputtered thin film (only for the MIM film) to couple localized plasmon mode of AuNP with multi-reflection mode and/or cavity resonator mode of TiO2. The optical extinctions of MI and MIM with differing TiO2 thickness were studied theoretically by finite-element method simulation and experimentally by optical spectrometry. The extinction peaks of MI and MIM shifted by exchanging the surrounding medium from air to TiO2. The interference of TiO2 in MI structure also affected the extinction spectra showing the oscillation along the spectrum of AuNP in TiO2. Then, the extinction degree of MIM was higher than that of MI because of the coupling between cavity resonance mode with localized plasmon mode and interband transition in AuNPs. In addition, the cross section of MI and MIM films were observed by scanning electron microscopy. The surface of thinner film was rough because TiO2 heterogeneously grew from AuNP. The irregular growth of TiO2 might have induced the wide-range extinction in 300-2500 nm after Au thin film deposition. The transient absorption spectra using a femtosecond laser were also carried out under the condition of 800 nm for excitation laser and 950 nm for probe laser. The long-lived electron (~1 ns) was observed in thick MIM film as a result of hot electron transfer from the gold nanostructure in the film.
掲載誌名
ChemNanoMat
ISSN
2199692X
出版者
Wiley-VCH
5
8
開始ページ
1015
終了ページ
1020
発行日
2019-04-03
備考
This is the peer reviewed version of the following article: S.-i. Yanagiya, T. Takahata, Y. Yoshitani, R. Kawakami, A. Furube, ChemNanoMat 2019, 5, 1015, which has been published in final form at https://doi.org/10.1002/cnma.201900042. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
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言語
eng
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部局
理工学系