Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer Composition
Deprotonation-induced conductivity shift of poly(3,4-ethylenedixoythiophene)s (PEDOTs) in aqueous solutions is a promising platform for chemical or biological sensor due to its large signal output and minimum effect from material morphology. Carboxylic acid group functionalized poly(C<sub>n<...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2019-04-01
|
Series: | Polymers |
Subjects: | |
Online Access: | https://www.mdpi.com/2073-4360/11/4/659 |
id |
doaj-dcf1932cab364a6eb6237dd7fd40ea49 |
---|---|
record_format |
Article |
spelling |
doaj-dcf1932cab364a6eb6237dd7fd40ea492020-11-24T21:21:14ZengMDPI AGPolymers2073-43602019-04-0111465910.3390/polym11040659polym11040659Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer CompositionHailemichael Ayalew0Tian-lin Wang1Hsiao-hua Yu2Smart Organic Materials Laboratory, Institute of Chemistry, Academia Sinica, 128 Sec. 2, Academia Road, Nankang, Taipei 11529, TaiwanSmart Organic Materials Laboratory, Institute of Chemistry, Academia Sinica, 128 Sec. 2, Academia Road, Nankang, Taipei 11529, TaiwanSmart Organic Materials Laboratory, Institute of Chemistry, Academia Sinica, 128 Sec. 2, Academia Road, Nankang, Taipei 11529, TaiwanDeprotonation-induced conductivity shift of poly(3,4-ethylenedixoythiophene)s (PEDOTs) in aqueous solutions is a promising platform for chemical or biological sensor due to its large signal output and minimum effect from material morphology. Carboxylic acid group functionalized poly(C<sub>n</sub>-EDOT-COOH)s are synthesized and electrodeposited on microelectrodes. The microelectrodes are utilized to study the effect of carboxylic acid side-chain length on the conductivity curve profiles in aqueous buffer with different pH. The conductivity shifts due to the buffer pH are effected by the length of the carboxylic acid side-chains. The shifts can be explained by the carboxylic acid dissociation property (p<i>K</i><sub>a</sub>) at the solid–liquid interface, self-doping effect, and effective conjugation length. Conductivity profiles of poly(EDOT-OH-<i>co</i>-C<sub>2</sub>-EDOT-COOH) copolymers are also studied. The shifts show linear relationship with the feed monomer composition used in electrochemical polymerization.https://www.mdpi.com/2073-4360/11/4/659poly(3,4-ethylenedioxythiophene)sdrain current measurementconductivity shiftsensorself-doping |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hailemichael Ayalew Tian-lin Wang Hsiao-hua Yu |
spellingShingle |
Hailemichael Ayalew Tian-lin Wang Hsiao-hua Yu Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer Composition Polymers poly(3,4-ethylenedioxythiophene)s drain current measurement conductivity shift sensor self-doping |
author_facet |
Hailemichael Ayalew Tian-lin Wang Hsiao-hua Yu |
author_sort |
Hailemichael Ayalew |
title |
Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer Composition |
title_short |
Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer Composition |
title_full |
Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer Composition |
title_fullStr |
Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer Composition |
title_full_unstemmed |
Deprotonation-Induced Conductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions: The Effects of Side-Chain Length and Polymer Composition |
title_sort |
deprotonation-induced conductivity shift of polyethylenedioxythiophenes in aqueous solutions: the effects of side-chain length and polymer composition |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2019-04-01 |
description |
Deprotonation-induced conductivity shift of poly(3,4-ethylenedixoythiophene)s (PEDOTs) in aqueous solutions is a promising platform for chemical or biological sensor due to its large signal output and minimum effect from material morphology. Carboxylic acid group functionalized poly(C<sub>n</sub>-EDOT-COOH)s are synthesized and electrodeposited on microelectrodes. The microelectrodes are utilized to study the effect of carboxylic acid side-chain length on the conductivity curve profiles in aqueous buffer with different pH. The conductivity shifts due to the buffer pH are effected by the length of the carboxylic acid side-chains. The shifts can be explained by the carboxylic acid dissociation property (p<i>K</i><sub>a</sub>) at the solid–liquid interface, self-doping effect, and effective conjugation length. Conductivity profiles of poly(EDOT-OH-<i>co</i>-C<sub>2</sub>-EDOT-COOH) copolymers are also studied. The shifts show linear relationship with the feed monomer composition used in electrochemical polymerization. |
topic |
poly(3,4-ethylenedioxythiophene)s drain current measurement conductivity shift sensor self-doping |
url |
https://www.mdpi.com/2073-4360/11/4/659 |
work_keys_str_mv |
AT hailemichaelayalew deprotonationinducedconductivityshiftofpolyethylenedioxythiophenesinaqueoussolutionstheeffectsofsidechainlengthandpolymercomposition AT tianlinwang deprotonationinducedconductivityshiftofpolyethylenedioxythiophenesinaqueoussolutionstheeffectsofsidechainlengthandpolymercomposition AT hsiaohuayu deprotonationinducedconductivityshiftofpolyethylenedioxythiophenesinaqueoussolutionstheeffectsofsidechainlengthandpolymercomposition |
_version_ |
1726000232662040576 |