Nanometer-scale structural, tribological, and optical properties of ultrathin poly(diacetylene) films

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The ability to create organized ultrathin films using organic molecules provides systems whose chemical, mechanical, and optical properties can be controlled for specific applications. In particular, polymerization of oriented mono- and multi-layer films containing the diacetylene group has produced a variety of robust, highly oriented, and environmentally responsive films with unique chromatic properties. These two-dimensional poly(diacetylene) (PDA) films, where the conjugation runs parallel to the film surface, have previously been prepared in a variety of forms. Of particular interest is the optical absorption of PDA due to its {pi}-conjugated backbone. A wide variety of PDA materials, including bulk crystals, thin ... continued below

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2 p.

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CARPICK,ROBERT W.; SASAKI,DARRYL Y. & BURNS,ALAN R. April 17, 2000.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 21 times . More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The ability to create organized ultrathin films using organic molecules provides systems whose chemical, mechanical, and optical properties can be controlled for specific applications. In particular, polymerization of oriented mono- and multi-layer films containing the diacetylene group has produced a variety of robust, highly oriented, and environmentally responsive films with unique chromatic properties. These two-dimensional poly(diacetylene) (PDA) films, where the conjugation runs parallel to the film surface, have previously been prepared in a variety of forms. Of particular interest is the optical absorption of PDA due to its {pi}-conjugated backbone. A wide variety of PDA materials, including bulk crystals, thin films, and solutions, exhibit a chromatic transition involving a significant shift in absorption from low to high energy bands of the visible spectrum, thus the PDA appears to transform from a blue to a red color. In addition, the red form is highly fluorescent, while the blue form is not. This transition can be brought about by heat binding of specific biological targets and applied stress (mechanochromism), among others. In this paper, the authors discuss the Langmuir deposition of ultrathin PDA films and the subsequent measurement of their structural, optical, and mechanical properties at the nanometer scale. By altering the head group functionality, the authors can choose between mono- and tri-layer PDA film structures. Measurements with the atomic force microscope (AFM) reveal strongly anisotropic friction properties that are correlated with the orientation of the conjugated polymer backbone orientation. Furthermore, the authors can use the AFM tip or a near field scanning optical microscope (NSOM) tip to locally convert the PDA from the blue form to the red form via applied stress. This represents the first time that mechanochromism has been observed at the nanometer scale. Dramatic structural changes are associated with this mechanochromic transition.

Physical Description

2 p.

Notes

OSTI as DE00755580

Medium: P; Size: 2 pages

Source

  • Journal Name: Polymer Prepriats, American Chemical Society; Other Information: Submitted to Polymer Preprints 2000, 41(2), American Chemical Society

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  • Report No.: SAND2000-0935J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 755580
  • Archival Resource Key: ark:/67531/metadc709051

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  • April 17, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 3:05 p.m.

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CARPICK,ROBERT W.; SASAKI,DARRYL Y. & BURNS,ALAN R. Nanometer-scale structural, tribological, and optical properties of ultrathin poly(diacetylene) films, article, April 17, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc709051/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.