Molecular aggregation of organic dyes controlled by the properties of layered nanoparticles

Juraj Bujdák

Index: 10.1016/j.jphotochemrev.2018.03.001

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Abstract

The phenomenon of metachromasia, which is related to molecular aggregation, leads to significant changes in the photophysical properties of dyes. This review summarizes knowledge about the molecular aggregation in hybrid systems based on inorganic nanoparticles and metachromatic dyes. History of metachromasia, physical principles of molecular aggregation, spectral properties of dye aggregates of various structures are briefly presented. Structure, surface properties and types of layered nanomaterials are also described. The main part of the review analyzes fundamental properties of nanoparticles, metachromatic dyes, and of their hybrid systems that influence the aggregation of dye molecules. The focus is on colloidal properties and the surface charge effect of nanoparticles. Proof of the key role of the surface charge of layered particles is supported by detailed analyzes of current research. The relevance of the phenomenon of molecular aggregation for research and application in the context of layered nanoparticles is summarized.