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Doping of Polyaniline with 6-Cyano-2-naphthol

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Title Doping of Polyaniline with 6-Cyano-2-naphthol
 
Creator DAS, D
DATTA, A
CONTRACTOR, AQ
 
Subject ACID DOPED POLYANILINE
STATE PROTON-TRANSFER
SUBSTITUTED POLYANILINE
CONDUCTING ISLANDS
ORGANIC-ACIDS
FILMS
POLYMER
SALT
NANOCOMPOSITES
EXCITONS
 
Description The conductivity of polyaniline (PANI) is ascribed to its emeraldine salt (PANI-ES), which is formed by protonation of its emeraldine base (PANI-EB) by acids. Generally, mineral acids are used for this purpose, but the use of dopants and additives to maintain the required acidity provides an alternative method to the preparation of PANI-ES. The present work attempts to achieve the protonation by the use of a weak organic acid, namely, 6-cyano-2-naphthol (6CN2), which is generally used as a superphotoacid, as its excited state pK(a) is significantly smaller than its ground state pK(a). The question here is if the protonation of the aniline moieties in PANI takes place and if it does, whether it takes place by dissociation of the ground state or the excited state of 6CN2. Room temperature conductance measurements were carried out to see the effect of doping. The formation of PANI-ES from PANI-EB has been monitored by UVvis spectrophotometry. When a polar counterion is inserted into the polymer matrix, it changes the environment of the nearby chains by introducing defects, reorganization of charges as a result of interaction with the polymer. Morphological investigation was done using optical microscopy, field emission gun scanning electron microscopy (FEGSEM), and field emission gun transmission electron microscopy FEGTEM. The influence of 6CN2 on the crystallinity of the polymer was determined by X-ray diffraction (XRD).
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-29T05:53:38Z
2014-12-29T05:53:38Z
2014
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY B, 118(45)12993-13001
1520-6106
http://dx.doi.org/10.1021/jp5060843
http://dspace.library.iitb.ac.in/jspui/handle/100/17243
 
Language English