J-Aggregate Formation of 6-Methyl-Merocyanine Dye in Mixed Langmuir–Blodgett Films with Arachidic Acid in a Wide Range of Mixing Ratio
J-Aggregate Formation of 6-Methyl-Merocyanine Dye in Mixed Langmuir–Blodgett Films with Arachidic Acid in a Wide Range of Mixing Ratio
复制标题
6-甲基部花青染料在混合 Langmuir-Blodgett 薄膜中与花生酸在多种混合比下的 J 聚集体形成
DOI：
10.1143/jjap.41.6223
复制
发表时间：
2002
影响因子：
1.5
通讯作者：
I. Hatta
中科院分区：
文献类型：
--
作者：
S. Kuroda;Hiroshi Ito;Y. Uchiyama;Takashi Mori;K. Marumoto;I. Hatta
通过改变相对于脂肪酸基质的染料浓度，通过光吸收和原子力显微镜 (AFM) 研究了混合 Langmuir-Blodgett 薄膜中 6-甲基-部花青染料 (6Me-DS) 分子的 J 聚集体形成。在染料与基质摩尔比低至 1:120 的宽范围内，可以在薄膜中观察到 J 带。随着摩尔比的减小，约80 nm的吸收峰位移几乎保持不变。 AFM 将染料域识别为高度较低的区域。通过将低高度区域的总面积与水面分子占据面积比计算出的面积进行比较，证实了这一点。即使在摩尔比为 1:120 的薄膜中，也可以观察到具有超过 103 个分子的典型染料域。该尺寸与使用观察到的波长偏移通过扩展偶极子模型计算出的 J 聚集体的预期尺寸一致。
By changing the dye concentration with respect to the fatty acid matrix, J-aggregate formation of the 6-methyl-merocyanine dye (6Me-DS) molecules in the mixed Langmuir–Blodgett film is studied by optical absorption and atomic force microscopy (AFM). The J-band is observed in the film with a wide range of molar ratios of the dye to the matrix down to 1:120. The absorption peak shift of approximatelty 80 nm remains almost unchanged with the decrease of the molar ratio. The dye domains are identified by AFM as the region with low height. This is confirmed by comparing the total area of low-height domains with that calculated with the molecular occupation area ratio on the water surface. Typical dye domains with more than 103 molecules are observed, even in the films of 1:120 molar ratio. The size is consistent with the expected size of J-aggregates calculated with the extended dipole model using the observed wavelength shift.