The fluorescence behavior from SAM of dendron with rhodamine B as a center

Yukito Naitoh, Akira Otomo, Hideki Miki, Isao Aoki, Shiyoshi Yokoyama

Research output: Contribution to journalArticle

Abstract

We studied energy transfer between rhodamine B molecules centered in each corn-shaped dendrons that forms self-assembled monolayer (SAM) film on an Au substrate. A SAM film using dendron moiety as a spacer can change the distance between rhodamines depending on the size, so that the energy transfer from an initially photo-excited rhodamine to its surrounding molecules can be controlled. The absorption spectrum of a SAM film for each generation of dendron was measured to ascertain a linear correlation between the generation and the distance. Picosecond time-resolved fluorescence spectra showed clear differences in the fluorescence decay dynamics between third-generation (G3) and fourth-generation (G4) dendron SAM films. In addition, we found that "dry" or "wet" dendron SAM considerably influenced fluorescence behavior. As a result, the use of "wet" G4 SAM is suitable in preserving photo-excitation energy. This is because it gave almost equal dynamics to G4 dendron in the dilute solution and prevented deactivation by energy dissipation.

Original languageEnglish
Pages (from-to)2371-2375
Number of pages5
JournalThin Solid Films
Volume516
Issue number9
DOIs
Publication statusPublished - Mar 3 2008

Fingerprint

rhodamine B
Self assembled monolayers
rhodamine
Fluorescence
fluorescence
Rhodamines
energy transfer
Energy transfer
corn
photoexcitation
deactivation
spacers
preserving
Dendrimers
molecules
Molecules
Excitation energy
Photoexcitation
energy dissipation
absorption spectra

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

The fluorescence behavior from SAM of dendron with rhodamine B as a center. / Naitoh, Yukito; Otomo, Akira; Miki, Hideki; Aoki, Isao; Yokoyama, Shiyoshi.

In: Thin Solid Films, Vol. 516, No. 9, 03.03.2008, p. 2371-2375.

Research output: Contribution to journalArticle

Naitoh, Yukito ; Otomo, Akira ; Miki, Hideki ; Aoki, Isao ; Yokoyama, Shiyoshi. / The fluorescence behavior from SAM of dendron with rhodamine B as a center. In: Thin Solid Films. 2008 ; Vol. 516, No. 9. pp. 2371-2375.
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AB - We studied energy transfer between rhodamine B molecules centered in each corn-shaped dendrons that forms self-assembled monolayer (SAM) film on an Au substrate. A SAM film using dendron moiety as a spacer can change the distance between rhodamines depending on the size, so that the energy transfer from an initially photo-excited rhodamine to its surrounding molecules can be controlled. The absorption spectrum of a SAM film for each generation of dendron was measured to ascertain a linear correlation between the generation and the distance. Picosecond time-resolved fluorescence spectra showed clear differences in the fluorescence decay dynamics between third-generation (G3) and fourth-generation (G4) dendron SAM films. In addition, we found that "dry" or "wet" dendron SAM considerably influenced fluorescence behavior. As a result, the use of "wet" G4 SAM is suitable in preserving photo-excitation energy. This is because it gave almost equal dynamics to G4 dendron in the dilute solution and prevented deactivation by energy dissipation.

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