Nonlinear photoluminescence imaging of isotropic and liquid crystalline dispersions of graphene oxide
| Autor: | Bohdan Senyuk, Gabriel Ceriotti, Ivan I. Smalyukh, Benjamin G. Pacheco, Taewoo Lee, James M. Tour, Natnael Behabtu, Matteo Pasquali |
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| Rok vydání: | 2012 |
| Předmět: |
Photoluminescence
Materials science Oxide FOS: Physical sciences General Physics and Astronomy Condensed Matter - Soft Condensed Matter law.invention chemistry.chemical_compound law Liquid crystal Materials Testing General Materials Science Lamellar structure Laser power scaling Particle Size Condensed Matter - Materials Science Graphene business.industry Lasers General Engineering Materials Science (cond-mat.mtrl-sci) Oxides Liquid Crystals Nanostructures chemistry Nonlinear Dynamics Femtosecond Luminescent Measurements Soft Condensed Matter (cond-mat.soft) Optoelectronics Anisotropy Graphite business Excitation Optics (physics.optics) Physics - Optics |
| Zdroj: | ACS nano. 6(9) |
| ISSN: | 1936-086X |
| Popis: | We report a visible-range nonlinear photoluminescence (PL) from graphene oxide (GO) flakes excited by near-infrared femtosecond laser light. PL intensity has nonlinear dependence on the laser power, implying a multiphoton excitation process, and also strongly depends on a linear polarization orientation of excitation light, being at maximum when it is parallel to flakes. We show that PL can be used for a fully three-dimensional label-free imaging of isotropic, nematic, and lamellar liquid crystalline dispersions of GO flakes in water. This nonlinear PL is of interest for applications in direct label-free imaging of composite materials and study of orientational ordering in mesomorphic phases formed by these flakes, as well as in biomedical and sensing applications utilizing GO. |
| Databáze: | OpenAIRE |
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