Scanning Nearfield Optical Spectral Mapping of Cyanine Aggregates on Mica

Nagata, Satoshi; Kaga, Kazuaki; Karthaus, Olaf

doi:10.1380/ejssnt.2005.94

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The roller apparatus has been described in detail before [5]. It consists of a glass rod with Teflon spacers, that is placed on the substrate (glass, mica or silicon) on a temperature-regulated hotplate.…”

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confidence: 99%

Growth of Unidirectionally Oriented Pentacene Nanofibers by a Roller Method

Kai

Karthaus

2007

e-J. Surf. Sci. Nanotechnol.

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Oriented crystal fibers of pentacene were produced by a simple casting process from trichlorobenzene solution at elevated temperature. The solution was placed in the air gap between a glass roller and a glass substrate. The width of the air gap was determined by a Teflon spacer wound around both ends of the roller. The roller was moved over the substrate with a constant speed and crystal fibers with approx. 100 nm height, micrometer width and a length of up to 100 µm were formed in the rolling direction. The fibers were characterized by optical microscopy and scanning electron microscopy.

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confidence: 99%

Growth of Unidirectionally Oriented Pentacene Nanofibers by a Roller Method

Kai

Karthaus

2007

e-J. Surf. Sci. Nanotechnol.

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“…Previously, it was reported for other thiacarbocyanine dye that larger J-aggregates have more intense and red-shifted fluorescence band on the substrate. 11 Therefore, it is reasonable that J 1 -band in longer wavelength region originates from larger THIATS J-aggregates. …”

Section: Resultsmentioning

confidence: 99%

Thiacarbocyanine dye J-aggregation in optical trapping potential

2006

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Kinetics of J-aggregation of thiacarbocyanine (THIATS) has been investigated by measuring time variation of fluorescence spectrum under the solvent evaporation process of THIATS solution. Fluorescence spectrum of the THIATS J-aggregates changes following the increase of concentration, reflecting the formation and ripening process of J-aggregates. These THIATS J-aggregates are trapped and gathered at the focal point by focusing near-infrared (NIR) laser beam into the solution. Two-photon excited fluorescence from the focal spot is concurrently detected with the same trapping laser beam. Fluorescence spectral change is accelerated by focusing NIR laser beam. This result could be attributed that J-aggregates with higher polarizability are preferably formed in the focal spot of NIR laser. Furthermore, we have succeeded in the deposition of J-aggregates on a glass substrate by optical trapping.

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“…A 2 mg/ml solution containing 1.8 mg/ml Au colloids (Tanaka Kikinzoku Kogyo KK) and 0.2 mg/ml regiorandom poly(hexylthiophene) was prepared by using aliquots of polystyrene and Au colloid solutions . A home-built roller apparatus [5] was * Corresponding author: karthaus@photon.chitose.ac.jp used to cast each of the solutions at a constant speed of a few mm/min onto the substrate. Optical and fluorescence microscopy (Olympus BX-50) was used to image the polymer patterns.…”

Section: Methodsmentioning

confidence: 99%