Chromophoric based, covalently bonded, self-assembled multilayer supralattices on inorganic oxide surfaces as nonlinear optical materials
Conference
·
OSTI ID:141077
- Los Alamos National Laboratory, NM (United States)
Chromophoric based, covalently bonded, self-assembled multilayer supralattices are synthesized and characterized. These chromorphore-containing structures are built in stepwise, layer by layer manner, in a repeating reaction sequence. The chromophores explored include 5,10,15,20-Tetra(4-pyridyl)-21H,23H-porphine (TPyP) and 4-(4-aminophenylazo)phenylarsonic acid (APAPA) and their derivatives. These strongly delocalized {pi}-electron structures were analyzed by UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), and polarized FTIR-ATR measurements. Second harmonic generation (SHG) measurements have been used to determine the absolute value of dominant element of the nonlinear susceptibility, Xzzzz{approximately}2 x 10{sup {minus}8} esu (TPyP), the uniformity of these films, and the dispersion of refractive indices. The average molecular orientation angle of the surface bound chromophores was obtained by both FTIR-ATR and SHG measurements and found to be in good agreement. The authors are exploring surface modification techniques based on self-assembled multilayers as a route to advanced materials for applications in nonlinear optics and chemical sensors.
- OSTI ID:
- 141077
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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