self-assembly of acenes into anisotropic fluorescent
23rd IUPAC Conference on Physical Organic Chemistry (ICPOC23) 3rd – 8th July 2016 • Sydney • Australia
SELF-ASSEMBLY OF ACENES INTO ANISOTROPIC FLUORESCENT NANOFIBERS AND THEIR PHOTO-PATTERNING ON SURFACES Christiaan de Vet,1 Philip Schäfer,1 Guillaume Raffy,1 André Del Guerzo1* 1
Institut des Sciences Moléculaires (ISM-UMR5255), Université de Bordeaux, CNRS, 351 Cours de la Libération – 33400 Talence, France *Email: [email protected]
The precise organization and patterning of optically active nano-objects in space is of high interest for future applications in photonics and opto-electronics. Nano-ribbons and –fibers are obtained by self-assembly or organic fluorophores (anthracenes and tetracenes). Moderate or highly anisotropic objects are obtained depending on the organization of the molecules within the object, as shown by fluorescence polarization microscopy. The degree of organization is determined by the self-assembly process, which has been shown to depend on the molecular design and on the experimental conditions (kinetics, thermodynamics). Two methods have been shown to further control the optical properties at the nano-scale. In the first method, nano-ribbons are dispersed on a surface, and their optical properties are patterned by photo-irradiation and photo-oxydation of one of the components. In a second method, the self-assembly of the photo-sensitive precursor of an anthracene gelator is induced by a focused laser beam. Thereby, fluorescent nano-fibers can be “written” as desired on a surface. These fibers display the same properties as those of the organogel obtained thermally with the anthracene gelator. Most properties of the nanofibers are thus governed by the self-assembly process, while the position of the nuclei yielding the fibers are controlled by the laser beam.
Figure: Examples of nanofiber structures patterned with a 473 nm diode laser on the glass surface. Fluorescence images were recorded exciting at 375 nm
CLC3
SELF-ASSEMBLY OF ACENES INTO ANISOTROPIC FLUORESCENT NANOFIBERS AND THEIR PHOTO-PATTERNING ON SURFACES Christiaan de Vet,1 Philip Schäfer,1 Guillaume Raffy,1 André Del Guerzo1* 1
Institut des Sciences Moléculaires (ISM-UMR5255), Université de Bordeaux, CNRS, 351 Cours de la Libération – 33400 Talence, France *Email: [email protected]
The precise organization and patterning of optically active nano-objects in space is of high interest for future applications in photonics and opto-electronics. Nano-ribbons and –fibers are obtained by self-assembly or organic fluorophores (anthracenes and tetracenes). Moderate or highly anisotropic objects are obtained depending on the organization of the molecules within the object, as shown by fluorescence polarization microscopy. The degree of organization is determined by the self-assembly process, which has been shown to depend on the molecular design and on the experimental conditions (kinetics, thermodynamics). Two methods have been shown to further control the optical properties at the nano-scale. In the first method, nano-ribbons are dispersed on a surface, and their optical properties are patterned by photo-irradiation and photo-oxydation of one of the components. In a second method, the self-assembly of the photo-sensitive precursor of an anthracene gelator is induced by a focused laser beam. Thereby, fluorescent nano-fibers can be “written” as desired on a surface. These fibers display the same properties as those of the organogel obtained thermally with the anthracene gelator. Most properties of the nanofibers are thus governed by the self-assembly process, while the position of the nuclei yielding the fibers are controlled by the laser beam.
Figure: Examples of nanofiber structures patterned with a 473 nm diode laser on the glass surface. Fluorescence images were recorded exciting at 375 nm
CLC3
