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Controlling Molecular Order in "Hairy-Rod" Langmuir-Blodgett Films: A Polarization-Modulation Microscopy Study

Gupta, V. K. and Kornfield, J. A. and Ferencz, A. and Wegner, G. (1994) Controlling Molecular Order in "Hairy-Rod" Langmuir-Blodgett Films: A Polarization-Modulation Microscopy Study. Science, 265 (5174). pp. 940-942. ISSN 0036-8075. https://resolver.caltech.edu/CaltechAUTHORS:20141210-124151810

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Abstract

The interplay of molecular weight, layer thickness, and thermal annealing in controlling molecular order in ultrathin Langmuir-Blodgett films is characterized with the use of polarization-modulation laser-scanning microscopy. The degree and direction of molecular alignment can be imaged rapidly and sensitively through the magnitude and orientation of linear dichroism in Langmuir-Blodgett films of rodlike poly(phthalocyaninatosiloxane) (PcPS). Images are presented for films as thin as two molecular layers (∼44 angstroms). Molecular alignment along the transfer direction is much stronger for films of PcPS with ∼25 repeat units (∼10 nanometers long) than for those with ∼50 repeat units (∼20 nanometers long). Enhancement of alignment by thermal annealing is also much greater for PcPS-25 than PcPS-50. Intimate interaction with the substrate suppresses improvement in alignment by annealing, evident by an anomalously small increase in anisotropic absorption of the first two layers.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.265.5174.940DOIArticle
http://www.jstor.org/stable/2884516JSTORArticle
ORCID:
AuthorORCID
Kornfield, J. A.0000-0001-6746-8634
Additional Information:© 1994 American Association for the Advancement of Science. Received 27 April 1994; accepted 27 June 1994. Supported by Raychem and the Caltech Consortium in Chemistry and Chemical Engineering: E. I. duPont de Nemours, Eastman Kodak, and 3M.
Funders:
Funding AgencyGrant Number
RaychemUNSPECIFIED
Caltech Consortium in Chemistry and Chemical EngineeringUNSPECIFIED
E. I. duPont de Nemours and Co.UNSPECIFIED
Eastman KodakUNSPECIFIED
3MUNSPECIFIED
Issue or Number:5174
Record Number:CaltechAUTHORS:20141210-124151810
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141210-124151810
Official Citation:Controlling Molecular Order in "Hairy-Rod" Langmuir-Blodgett Films: A Polarization-Modulation Microscopy Study V. K. Gupta, J. A. Kornfield, A. Ferencz, and G. Wegner Science 12 August 1994: 265 (5174), 940-942. [DOI:10.1126/science.265.5174.940]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52553
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Dec 2014 20:58
Last Modified:15 May 2020 22:38

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