Quantification of methylene blue aggregation on a fused silica surface and resolution of individual absorbance spectra

被引：44

作者：

Ohline, SM ^{[1
]}

Lee, S ^{[1
]}

Williams, S ^{[1
]}

Chang, C ^{[1
]}

机构：

[1] Wellesley Coll, Dept Chem, Wellesley, MA 02481 USA

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 346卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(01)00962-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The absorbance spectra of individual methylene blue aggregates adsorbed by spin coating on a fused silica surface are resolved. Using singular value decomposition and a model incorporating Beer's Law and elemental conservation, a varied concentration family of UV-Vis spectra are fit. Results indicate that H-dimer formation occurs beginning at a surface concentration of 3 x 10(13) molecules/cm(2), and further aggregate formation, including J-type dimers, is significant above 2 x 10(14) molecules/cm(2). Based on our results, past assumptions that a spin-coated surface (using a millimolar coating solution) results in a monolayer of methylene blue monomers should be reexamined. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：9 / 15

页数：7

共 26 条

[1] Photosensitization aspects of pinacyanol H-aggregates.: Charge injection from singlet and triplet excited states into SnO2 nanocrystallites [J].