Photoinduced properties of liquid crystalline azobenzene polymer in Langmuir–Blodgett films investigated by surface plasmon resonance

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作者：

J Gu，B Liang，L Liu，Y Tian，Y Chen，B Lu，Z Lu

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摘要：

A novel phenomenon of photoisomerization-induced switch properties in liquid crystalline azobenzene polymer poly{2-hydroethylmethacrylate}-co-{{6-[4-( s -2-methyl-1-bufyloxycarbonylphenylazo)phenoxy]hexylmethacrylate}} Langmuir–Blodgett (LB) monolayers is reported. These monolayers were deposited on gold film and irradiated with UV (360 nm) and blue (450 nm) light. The switching properties were investigated by the surface plasmon resonance (SPR) technique. It has been shown that it is possible to switch the refractive index reversibly by irradiating these films with light of appropriate wavelength. Evidence shows that the surface pressure has an influence on the evolution of the resonance angle.

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关键词：

Experimental/ isomerisation Langmuir-Blodgett films liquid crystal polymers monolayers photochemistry photochromism polymer films refractive index surface plasmons surface tension ultraviolet spectra visible spectra/ liquid crystalline polymer azobenzene Langmuir-Blodgett films photoinduced properties photoisomerization switch properties surface plasmon resonance monolayers gold film substrate refractive index surface pressure resonance angle evolution molecular switch 190 to 600 nm/ A7865J Optical properties of nonmetallic thin films A6817 Monolayers and Langmuir-Blodgett films A6130 Liquid crystals A7320M Collective excitations (surface states) A7820D Optical constants and parameters (condensed matter) A8230Q Isomerization and rearrangement A8250 Photochemistry and radiation chemistry A7840H Visible and ultraviolet spectra of other nonmetals/ wavelength 1.9E-07 to 6.0E-07 m