Abstract
Fabrication of nano-sized objects is one of the most important issues in nanoscience and nanotechnology. Soft nanomaterials with flexible properties have been given much attention and can be obtained through bottom-up processing from functional molecules, where self-assembly based on supramolecular chemistry and designed assembly have become crucial processes and techniques. Among the various functional molecules, dyes have become important materials in certain areas of nanotechnology and their self-assembling behaviors have been actively researched. In this short review, we briefly introduce recent progress in self-assembly of optical molecules and dyes, based mainly on supramolecular concepts. The introduced examples are classified into four categories: self-assembly of (i) low-molecular-weight dyes and (ii) polymeric dyes and dye self-assembly (iii) in nanoscale architectures and (iv) at surfaces.
Highlights
Fabrication of nano-sized objects is one of the most important areas in nanoscience and nanotechnology
In the solid state as well as in solution, it has been demonstrated that the mutual transformation between H- and J-type chromophore packing can be achieved by controlling the temperature. Based on these new findings, the construction of further functional supramolecular systems can be approached from coreunsubstituted perylene bisimides, which show optical and electronic properties that can be changed by external inputs
The contrasting entrapment behaviour observed with the di(propylthio)perylenetetracarboxylic diimide (PTCDI)/melamine hexagonal networks relative to PTCDI/melamine and Br2-PTCDI/melamine systems demonstrates the potential for control, through selection of side chains, of the properties of these cavities. These results indicate a new method of functionalisation for network pores, opening up the possibility of designing nanostructured surface structures with chemical selectivity and applications in nanostructure templating
Summary
Fabrication of nano-sized objects is one of the most important areas in nanoscience and nanotechnology. Sci. 2009, 10 have received much attention These materials and related structures can be obtained through bottomup processes from unit functional molecules, where self-assembly based on supramolecular chemistry [1,2] and designed assembly including Langmuir-Blodgett (LB) [3,4,5] methods and layer-by-layer (LbL) adsorption [6,7,8,9,10] have become crucial processes and techniques. Novel functions are being pursued, including stimuli-sensitive luminescence, photoconductivity, laser sensitivity, electrification properties, dichromic properties, and non-linear optic behaviors These unique properties are necessary for thermal devices, photography, laser technology, piezoelectric devices, and liquid crystalline devices, and are expected to be of importance in more advanced applications such as information memory and displays, energy conversion, and medical uses. The introduced examples are classified into four categories: self-assembly of (i) low-molecular-weight dyes and (ii) polymeric dyes and dye self-assembly (iii) in nanoscale architectures and (iv) at surfaces
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