Design and Characterization of Nanoarchitectures from Multifunctional Polyparaphenylenes
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Design and Characterization Polyparaphenylenes
of
Nanoarchitectures
Q11.5.1
from
Multifunctional
Renu Ravindranath,1 Suresh Valiyaveettil,*1 Chinnapan Baskar,1 Ananda Putra,1 Fitri Fitrilawati,2 Wolfgang Knoll2 1 Department of Chemistry, 2Department of Materials Science, National University of Singapore, Singapore, 117543 Abstract Conducting polymers are interesting materials due to their wide range of applications in electronics, sensing, photonics and display applications. The present paper delineates the synthesis and characterization of the three functionalized poly (p-phenylene)s (PPP) (A-C) and solution properties of the polymers. The self-assembly of the polymers were investigated on various substrates and the optical/morphological properties of thin films of these polymers were also studied. The spontaneous self assembly of the modified PPP’s lead to the formation of thin films on both hydrophilic and modified surfaces. INTRODUCTION Among the various π- conjugated polymers, poly (p-phenylene)s (PPP)1-3 and its derivatives have found considerable interest over the past 20 years due to their high photo luminescence efficiency in blue light-emitting diodes4. Thin films of polymers have been fabricated for technological applications such as light- emitting diodes (LEDs), sensors5, polymer electronics, solar cells, and optical switching devices. The self- assembly of π- conjugated macromolecules on insulating solid substrates offers a strategy for construction of well-defined and stable nanometer-sized structures with chemical functionalities and physical properties that are of potential use as active components in electronic devices6-7. Ultra thin organic films can either be prepared using the self- assembly technique8-10, or by the Langmuir- Blodgett11-12 deposition method. The present paper describes the design and characterization of the nanoarchitectures using these functionalized poly (p-phenylene)s. We have synthesized and characterized three functionalized poly (p-phenylene)s (Fig 1A-B). The amphiphilicity of the polymer helps to develop Langmuir-Blodgett films and self assembled monolayerson various substrates. OH
OC12H24OH
n
n C12H25O
C12H25O
1
2
Scheme 1. Molecular structure of the polymers 1 and 2 EXPERIMENTAL DETAILS
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Q11.5.2
Synthesis of the polymers A and B: The synthetic schemes for the polymers were given in the schemes 2-4. The detailed synthesis procedure and characterization data of the polymers have been published elsewhere.13 Preparation of thin films (a) Langmuir Blodgett (LB) film: Chloroform solutions of the asymmetrically functionalized polyparaphenylene (1 or 2) (∼1 mg/ml) were readily spread on to Milli-Q purified air-water interface of a Langmuir trough (NIMA 1232D1D2 Modular Combination LB Trough) and the pressure area is
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