Self-assembled multilayers and photoluminescence properties of a new water-soluble poly(para-phenylene) Page: 1 of 8
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
LA-UR- 97-4 9 3
SELF-ASSEMBLED MULTILAYERS AND PHOTOLUMINESCENCE
PROPERTIES OF A NEW WATER-SOLUBLE POLY(PARA-PHENYLENE)
CoNv F-9 Q aol i
Xiaobo Shi, DeQuan Li, M. Lott, M. R. Fitzsimmons, and G. P. Van Patten
Chemical Science and Technology Division(CST-4) and Manuel Lujan Jr. Neutron S te
Center, Los Alamos National Laboratory, Los Alamos, NM 87545
ABSTRACT OG' '
This paper reports the synthesis and characterizations of a new water-soluble polypa
phenylene) (PPP) and its applications in preparing self-assembled multi-layer films. This new
water-soluble conducting polymer was prepared through the sulfonation reaction of poly(p-
quarterphenylene-2,2'-dicarboxylic acid). The incorporation of sulfonate groups has dramatically
improved PPP's solubility in water at a wide pH range, whereas previous PPP is only slightly
soluble in basic solutions. Dilute aqueous solutions of this polymer with acidic, neutral or basic
pH emit brilliant blue light while irradiated with UV light. The sulfonated PPP emits from 350 nm
to 455 nm with a maximum intensity at 380 nm. Self-assembled multilayers of this sulfonated PPP
were constructed with a positively charged polymer poly(diallyl dimethyl ammonium chloride) and
characterized with various surface analyses. Conductive (RuG2 and ITO), semiconductive (Si
wafer), and non-conductive (Si02) substrates were used in the preparation of self-assembled
multilayers. Electrical, optical and structural properties of these novel self-assembled thin films
will be discussed.
Conducting polymers are a novel class of conjugated materials which combine the
electronic and optical properties of semiconductors and the processabilty of conventional
polymers. Conducting polymers, such as PPP or (poly(para-phenylene)), PPV or
(poly(phenylene vinylene), and polythiophene, typically possess the delocalized t electrons in
their polymeric backbones. These aromatic, rigid-rod polymers play an important role in some
important technologies including smart and high performance molecular engineered materials
and polymer optoelectronic devices. The organic electroluminescence device (LED) based on
these conjugated conducting polymers have been studied extensively in the last decade. The blue-
emission LEDs based on PPP was reported by Leising et al. in 1992. Later on, Fou et al.
reported the incorporation of self-assembled multilayer technology into the fabrication of
LED's. In general, the aforementioned unmodified PPP and cured PPV polymers are not
soluble in water. To avoid using toxic and corrosive solvents, Novak et al. reported the first C
example of water soluble poly(para-phenylene) derivative in 1991 which provides a new route
to synthesize and process rigid-rod polymers in water. The molecular structure of this water-
soluble poly(p-quaterphenylene-2,2'-dicarboxylic acid is illustrated in Figure 1(a). This polymer,
however, is only slightly soluble in water in its salt form. '
COOH(M) SO3H(M) OOH(M)
- n - - - - n
COOH(M) SO3H(M) COOH(M)
Figure 1(a). Poly(p-quarterphenylene- Figure 1(b). Poly(p-quarterphenylene-
2,2'-dicarboxylic acid disulfonic-dicarboxylic acid
ISTRISUTION OF THIS DOCUMENT IS LINUMITED
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Shi, X.; Li, D.Q.; Luett, M.; Fitzsimmons, M.R. & Van Patten, G.P. Self-assembled multilayers and photoluminescence properties of a new water-soluble poly(para-phenylene), report, March 1, 1998; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc706283/m1/1/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.