Optical studies on composite Langmuir-Blodgett films containing ytterbium bis-phthalocyanine

RAY, A. K., NABOK, A. V., HASSAN, A. K., SILVER, J., MARSH, P. and RICHARDSON, T. (1999). Optical studies on composite Langmuir-Blodgett films containing ytterbium bis-phthalocyanine. Philosophical Magazine B-Physics of Condensed Matter Statistical Mechanics Electronic Optical and Magnetic Properties, 79 (7), 1005-1019.

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Link to published version:: 10.1080/13642819908214856

Abstract

Langmuir films of pure ytterbium bis-phthalocyanine (YbPc2) molecules and its mixtures with calix[4]resorcinarene (C[4]RA) molecules were studied by UVvis absorption spectra and surface pressure-area (Pi-A) isotherm measurements. Langmuir-Blodgett (LB) films of both pure YbPc2 and YbPc2-C[4]RA mixtures were produced and characterized with UV-vis spectra and surface plasmon resonance (SPR). In the case of LB films of pure YbPc2 molecules, values of 1.68 x 10(7) m(-1) and 1.76% were found for the absorption coefficient at spectral maxima and the reflectance loss. Mixed YbPc2-C[4]RA films give smaller values depending on the mixing ratio. SPR measurements, made in two media with different refractive indices, yielded accurate values of thickness of 2.06 +/- 0.06 nm and refractive index of 1.70 +/- 0.02 for LB films of pure YbPc2 molecules. Electrochromic effects, driven by electrochemical oxidation/reduction of the Yb central atom, were registered in LB films of pure YbPc2 molecules by both UV-vis absorption spectra and SPR measurements.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1080/13642819908214856
Depositing User: Helen Garner
Date Deposited: 20 May 2010 16:43
Last Modified: 05 Oct 2010 16:36
URI: http://shura.shu.ac.uk/id/eprint/2000

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