- Tytuł:
- Time-Resolved and Near-Field Scanning Optical Microscopy Study on Porphyrin J-Aggregate
- Autorzy:
-
Miura, A.
Matsumura, K.
Su, X.
Tamai, N. - Powiązania:
- https://bibliotekanauki.pl/articles/1993153.pdf
- Data publikacji:
- 1998-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
- 78.47.+p
- Opis:
- Water-soluble porphyrin, 5,10,15,20-tetraphenyl- 21H,23H-porphine-tetrasulfonic acid (TPPS), forms J-aggregate in aqueous solution depending on experimental conditions such as pH, dye concentration, and/or ionic strength. The steady-state fluorescence and picosecond single-photon timing spectroscopy were applied for protonated monomer and J-aggregate in aqueous solution and in thin films to reveal the dynamics in the S$\text{}_{2}$ and S$\text{}_{1}$ states. The S$\text{}_{2}$ fluorescence spectra from the protonated monomer and J-aggregate were observed in addition to the normal S$\text{}_{1}$ fluorescence. The lifetime of the S$\text{}_{2}$ state was estimated to be ≈5 ps for J-aggregate, whereas the lifetime is shorter than 1 ps for protonated TPPS monomer. The mesoscopic structures of J-aggregate in thin film with and without polymer on the glass surface were examined by scanning near-field optical microscopy. With the surface topography and scanning near-field optical microscopy transmission images, TPPS J-aggregate was found to form a long and narrow tube-like structure which has a few μm length, 0.2-0.5 μm width, and 5-30 nm height. An unidirectional orientation of the structure was also found, which may be originated from the spin-coating process.
- Źródło:
-
Acta Physica Polonica A; 1998, 94, 5-6; 835-846
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł