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In Situ Measurement of the Conductance of Regioregular Poly-3 ',4 '-didodecyl-2,2 ':5 ',2 ''-terthiophene during Potentiodynamic Growth




TekijätDini Danilo, Salatelli Elisabetta, Kankare Jouko

KustantajaELECTROCHEMICAL SOC INC

Julkaisuvuosi2021

JournalJournal of The Electrochemical Society

Tietokannassa oleva lehden nimiJOURNAL OF THE ELECTROCHEMICAL SOCIETY

Lehden akronyymiJ ELECTROCHEM SOC

Artikkelin numeroARTN 082507

Vuosikerta168

Numero8

Sivujen määrä8

ISSN0013-4651

eISSN1945-7111

DOIhttps://doi.org/10.1149/1945-7111/ac1b4e

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/66955278


Tiivistelmä
This work reports a study of regioregular poly-3 ',4 '-didodecyl-2,2 ':5 ',2 ''-terthiophene (poly-3 ' 4 '-DDTT) deposited electrochemically onto a double-band electrode for the in situ measurement of the electrical conductance. The electrodeposition of poly-3 ' 4 '-DDTT was conducted in the potentiodynamic mode within the applied potential interval 0 <= E (appl) <= 0.9 V vs Ag/Ag+ employing an electrolyte that contained the terthiophenic monomer 3 ' 4 '-DDTT (the starting redox species). These electrochemical conditions warrant the oxidation of 3 ' 4 '-DDTT (initiation step) and prevent the oxidative degradation of the polymerization product(s). Through the adoption of conformal mapping we could calculate the electrical conductivity of the electrodeposited polymer thanks to the observation of a linear variation of conductance with the consumed charge of polymerization. The use of conformal mapping has allowed also the determination of the volume yield for the poly-3 ' 4 '-DDTT under consideration. The electrical conductivity of poly-3 ' 4 '-DDTT depended nonlinearly on the scan rate of electrodeposition and varied in the broad range 12 - 34 S cm(-1). The variability of poly-3 ' 4 '-DDTT conductivity depended on the nature of the electrodeposit which, in turn, depended on the rate of oxidative coupling (determined by the electrical current) and on the rate of precipitation (determined by the conditions of saturation in proximity of the double-band electrode).

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