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

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

Research output: Contribution to journalArticlepeer-review


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
Issue number9
Publication statusPublished - Mar 3 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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