Iodine Doping of Poly(thiophene-2,5-diyl) and Poly(3-alkylthiophene-2,5-diyl)s in Aqueous Media

Abstract

KEY WORDSn-Conjugated Polymer I Poly(3-alkylthiophene-2,5-diyl) I Iodine Doping in Aqueous Media I Electrical Conductivity I Poly(thiophene-2,5-diyl) 1 -5 and poly(3-alkylthiophene-2,5-diyl)s6-12 have attracted great interest, because these n-conjugated polymers not only possess unique electrical and optical properties but also have high stability toward air both in undoped and doped states. In addition, poly(3-alkylthiophene-2,5-diyl)s containing a long alkyl chain in the monomer unit show good processibility. Doping of then-conjugated polymers with

Environmental Responses of Polythiophene Hydrogels

“…Doping is commonly performed from the vapor state or in organic solvents [9][10][11] and has rarely been studied in an aqueous solution. 12 We attempted the I 2 -doping of P3TAA polymer and gel in phosphate buffer solution containing 0.2 M KI at pH ) 7.0 under an argon atmosphere. No peak characteristic of the I 2 doping was observed for the gel, while the P3TAA solution changed from yellow to black, suggesting the presence of free carriers in the conducting state.…”

“…Doping of π-conjugated polymers is a common method to increase their conductivity. Doping is commonly performed from the vapor state or in organic solvents − and has rarely been studied in an aqueous solution . We attempted the I 2 -doping of P3TAA polymer and gel in phosphate buffer solution containing 0.2 M KI at pH = 7.0 under an argon atmosphere.…”

Conformal, Conducting Poly(3,4-ethylenedioxythiophene) Thin Films Deposited Using Bromine as the Oxidant in a Completely Dry Oxidative Chemical Vapor Deposition Process

“…Halogens have been widely used by researchers as a dopant for making conducting polymers. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Mathai et al 14 studied the effect of iodine doping on the band gap of aniline thin films. Gal et al 15 compared the electrical conductivity of poly-(2-ethynylthiophene) and poly(2-ethynylfuran) doped with iodine, bromine, and iron chloride.…”

“…In an attempt to make the process completely dry, halogens are used as the replacement for iron chloride as the oxidant for the oCVD process in our experiments. Halogens have been widely used by researchers as a dopant for making conducting polymers. − Mathai et al studied the effect of iodine doping on the band gap of aniline thin films. Gal et al compared the electrical conductivity of poly(2-ethynylthiophene) and poly(2-ethynylfuran) doped with iodine, bromine, and iron chloride.…”

Synthesis of π‐Conjugated Polymers Bearing Electronic and Optical Functionalities by Organometallic Polycondensations. Chemical Properties and Applications of the π‐Conjugated Polymers

“…As described above, due to an electron-withdrawing effect of the -C≡C-unit, the PAE type polymers are susceptible to electrochemical reduction. 70,71 The π-conjugated polymers can also undergo chemical redox reactions [e.g., oxidation (or p-doping) by I 2 and FeCl 3 33,[110][111][112][113][114][115][116][117][118][119][120][58][59][60][61][62][63][64]149,155,156 and reduction (or n-doping) by Na]. 32,34,40,160,181 The electrochemically and chemically oxidized or reduced polymers show electrical conductivity in the 10 -3 to 10 3 S cm -1 range, presumably due to the cationic or anionic carriers formed along the π-conjugated system.…”