Nonlinear Optical Properties and Crystalline Orientation of 2-Methyl-4-nitroaniline Layers Grown on Nanostructured Poly(tetrafluoroethylene) Substrates

Autor:	Renaud A. L. Vallée, and E. Toussaere, M. Dosière, Joseph Zyss, P. Damman
Rok vydání:	2000
Předmět:	Diffraction Chemistry business.industry Transition temperature Analytical chemistry Hyperpolarizability General Chemistry Substrate (electronics) 4-Nitroaniline Epitaxy Biochemistry Catalysis chemistry.chemical_compound Colloid and Surface Chemistry Optics Ellipsometry Tetrafluoroethylene business
Zdroj:	Journal of the American Chemical Society. 122:6701-6709
ISSN:	1520-5126 0002-7863
DOI:	10.1021/ja991894u
Popis:	A new methodology to study the second-order nonlinear optical coefficients of organic materials was developed. The combination of oriented crystal growth (epitaxy or grapho-epitaxy) with grazing incidence X-ray diffraction and second harmonic ellipsometry gives an overview of the relations between the molecular hyperpolarizability and the crystalline nonlinear susceptibility tensor. Thin organic layers of 2-methyl-4-nitroaniline (MNA) were grown on nanostructured poly(tetrafluoroethylene) (PTFE) substrates prepared by the friction transfer method. The investigations show that MNA crystallizes with two definite single-crystal-like orientations depending on the substrate temperature. The low- and high-temperature modes of growth correspond to a deposit of the aromatic ring more or less flat ((11−2) orientation) or edge ((010) orientation) on the substrate, respectively, the transition temperature corresponding to the first order−disorder transition of PTFE (∼19 °C). Two different orientation mechanisms were...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::848e5a53216cfd0562cd71070356b7d1 https://doi.org/10.1021/ja991894u Zobrazit plný text záznamu