The influence of lipophilic additives on the emeraldine base-emeraldine salt transition of polyaniline

Tom Lindfors (Corresponding Author), Henrik Sandberg, Ari Ivaska

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

The pH sensitivity of polyaniline (PANI) membranes containing potassium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (KTFPB), potassium tetrakis(4-chlorophenyl)borate (KTpClPB), cesium carborane (Cs-carborane), tetradodecylammonium tetrakis(4-chlorophenyl)borate (TDATpClPB, ETH 500) or tridodecylmethylammonium chloride (TDMACl) as the lipophilic additive have been studied in this work. It is shown with UV-Vis spectroscopy, potentiometry, energy dispersive X-ray analysis (EDXA) and dc conductivity measurements that the PANI membrane containing 30% (w/w) of the anionic additive KTFPB is in the electrically conducting emeraldine salt (ES) form still at pH 9 and that the film is insensitive to pH between 2 and 9. The reason for the unusual pH insensitivity is probably that the TFPB− anions prevent the pH dependent ES–emeraldine base (EB) transition from occurring by hindering the acid anions to leave the polymer chains and in this way locking PANI in the ES form.

All membrane components were dissolved in tetrahydrofuran (THF) and the PANI membranes were prepared by drop casting on glassy carbon substrates. PANI was made soluble in THF either with the phosphoric acid dibutyl ester (DBP) or phosphoric acid dihexadecyl ester (DHDP).
Original languageEnglish
Pages (from-to)231-242
JournalSynthetic Metals
Volume142
Issue number1-3
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Polyaniline
Salts
salts
borates
membranes
Membranes
phosphoric acid
Phosphoric acid
tetrahydrofuran
Anions
Potassium
esters
potassium
Esters
Negative ions
anions
carborane
potentiometric analysis
Cesium
Energy dispersive X ray analysis

Cite this

@article{9f9d2643cf364b73b3f580c66a52d17e,
title = "The influence of lipophilic additives on the emeraldine base-emeraldine salt transition of polyaniline",
abstract = "The pH sensitivity of polyaniline (PANI) membranes containing potassium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (KTFPB), potassium tetrakis(4-chlorophenyl)borate (KTpClPB), cesium carborane (Cs-carborane), tetradodecylammonium tetrakis(4-chlorophenyl)borate (TDATpClPB, ETH 500) or tridodecylmethylammonium chloride (TDMACl) as the lipophilic additive have been studied in this work. It is shown with UV-Vis spectroscopy, potentiometry, energy dispersive X-ray analysis (EDXA) and dc conductivity measurements that the PANI membrane containing 30{\%} (w/w) of the anionic additive KTFPB is in the electrically conducting emeraldine salt (ES) form still at pH 9 and that the film is insensitive to pH between 2 and 9. The reason for the unusual pH insensitivity is probably that the TFPB− anions prevent the pH dependent ES–emeraldine base (EB) transition from occurring by hindering the acid anions to leave the polymer chains and in this way locking PANI in the ES form.All membrane components were dissolved in tetrahydrofuran (THF) and the PANI membranes were prepared by drop casting on glassy carbon substrates. PANI was made soluble in THF either with the phosphoric acid dibutyl ester (DBP) or phosphoric acid dihexadecyl ester (DHDP).",
author = "Tom Lindfors and Henrik Sandberg and Ari Ivaska",
year = "2004",
doi = "10.1016/j.synthmet.2003.09.004",
language = "English",
volume = "142",
pages = "231--242",
journal = "Synthetic Metals",
issn = "0379-6779",
publisher = "Elsevier",
number = "1-3",

}

The influence of lipophilic additives on the emeraldine base-emeraldine salt transition of polyaniline. / Lindfors, Tom (Corresponding Author); Sandberg, Henrik; Ivaska, Ari.

In: Synthetic Metals, Vol. 142, No. 1-3, 2004, p. 231-242.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The influence of lipophilic additives on the emeraldine base-emeraldine salt transition of polyaniline

AU - Lindfors, Tom

AU - Sandberg, Henrik

AU - Ivaska, Ari

PY - 2004

Y1 - 2004

N2 - The pH sensitivity of polyaniline (PANI) membranes containing potassium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (KTFPB), potassium tetrakis(4-chlorophenyl)borate (KTpClPB), cesium carborane (Cs-carborane), tetradodecylammonium tetrakis(4-chlorophenyl)borate (TDATpClPB, ETH 500) or tridodecylmethylammonium chloride (TDMACl) as the lipophilic additive have been studied in this work. It is shown with UV-Vis spectroscopy, potentiometry, energy dispersive X-ray analysis (EDXA) and dc conductivity measurements that the PANI membrane containing 30% (w/w) of the anionic additive KTFPB is in the electrically conducting emeraldine salt (ES) form still at pH 9 and that the film is insensitive to pH between 2 and 9. The reason for the unusual pH insensitivity is probably that the TFPB− anions prevent the pH dependent ES–emeraldine base (EB) transition from occurring by hindering the acid anions to leave the polymer chains and in this way locking PANI in the ES form.All membrane components were dissolved in tetrahydrofuran (THF) and the PANI membranes were prepared by drop casting on glassy carbon substrates. PANI was made soluble in THF either with the phosphoric acid dibutyl ester (DBP) or phosphoric acid dihexadecyl ester (DHDP).

AB - The pH sensitivity of polyaniline (PANI) membranes containing potassium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (KTFPB), potassium tetrakis(4-chlorophenyl)borate (KTpClPB), cesium carborane (Cs-carborane), tetradodecylammonium tetrakis(4-chlorophenyl)borate (TDATpClPB, ETH 500) or tridodecylmethylammonium chloride (TDMACl) as the lipophilic additive have been studied in this work. It is shown with UV-Vis spectroscopy, potentiometry, energy dispersive X-ray analysis (EDXA) and dc conductivity measurements that the PANI membrane containing 30% (w/w) of the anionic additive KTFPB is in the electrically conducting emeraldine salt (ES) form still at pH 9 and that the film is insensitive to pH between 2 and 9. The reason for the unusual pH insensitivity is probably that the TFPB− anions prevent the pH dependent ES–emeraldine base (EB) transition from occurring by hindering the acid anions to leave the polymer chains and in this way locking PANI in the ES form.All membrane components were dissolved in tetrahydrofuran (THF) and the PANI membranes were prepared by drop casting on glassy carbon substrates. PANI was made soluble in THF either with the phosphoric acid dibutyl ester (DBP) or phosphoric acid dihexadecyl ester (DHDP).

U2 - 10.1016/j.synthmet.2003.09.004

DO - 10.1016/j.synthmet.2003.09.004

M3 - Article

VL - 142

SP - 231

EP - 242

JO - Synthetic Metals

JF - Synthetic Metals

SN - 0379-6779

IS - 1-3

ER -