1. Electric-field-induced layer-by-layer fabrication of inorganic–organic hybrid second-order nonlinear optical films
- Author
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Wang, Shiwei, Zhao, Lisha, Zhang, Xiaolong, Shi, Zuosen, Cui, Zhanchen, and Yang, Yanqiang
- Subjects
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OPTICAL films , *NONLINEAR optics , *ELECTRIC fields , *MULTILAYERED thin films , *DIAZO compounds , *CHEMICAL reactions , *MOLECULAR rotation , *CHEMICAL structure - Abstract
Abstract: This work focused on the development of a novel method for molecular level assembly and processing of inorganic–organic hybrid second-order nonlinear optical (SONLO) multilayer films. Aromatic diazo group linked silicon sol was first synthesized and used as a polycation. This oligomer was assembled into inorganic–organic hybrid SONLO multilayer films by electric-field-induced layer-by-layer assembly technique with a low molecular weight chromophore molecule as an anion. After UV irradiation, the electrostatic interaction between layers converted to covalent bonds. Large second-harmonic generation signal of the assembled film was observed, which confirmed that the chromophore in the film had a high degree of molecular orientation as assembled under the electric field. As the cross-linked structure and silicon oxygen meshwork in the films, the resulting inorganic–organic hybrid multilayer films displayed good thermal and chemical stability, and excellent NLO properties. [Copyright &y& Elsevier]
- Published
- 2009
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