Volume 12, Pages (February 2019)

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Volume 12, Pages 66-75 (February 2019) Sequential Solution Polymerization of Poly(3,4-ethylenedioxythiophene) Using V2O5 as Oxidant for Flexible Touch Sensors Rui Chen, Kuan Sun, Qi Zhang, Yongli Zhou, Meng Li, Yuyang Sun, Zhou Wu, Yuyang Wu, Xinlu Li, Jialei Xi, Chi Ma, Yiyang Zhang, Jianyong Ouyang iScience Volume 12, Pages 66-75 (February 2019) DOI: 10.1016/j.isci.2019.01.003 Copyright © 2019 The Author(s) Terms and Conditions

iScience 2019 12, 66-75DOI: (10.1016/j.isci.2019.01.003) Copyright © 2019 The Author(s) Terms and Conditions

Figure 1 Identification of SSP PEDOT (A) FTIR spectra of EDOT, PH1000, and SSP PEDOT. (B) Raman spectra of PH1000 and SSP PEDOT. (C) Benzoid or quinoid structure in a PEDOT chain. iScience 2019 12, 66-75DOI: (10.1016/j.isci.2019.01.003) Copyright © 2019 The Author(s) Terms and Conditions

Figure 2 Compositional Analysis of SSP PEDOT Film (A) XPS spectra (V2p) of V2O5 and SSP PEDOT. (B) XPS spectra (S2p) of PH1000. (C) XPS spectra (S2p) of SSP PEDOT. iScience 2019 12, 66-75DOI: (10.1016/j.isci.2019.01.003) Copyright © 2019 The Author(s) Terms and Conditions

Figure 3 Oxidation state of SSP PEDOT Film (A) UV-vis-NIR absorption spectra of SSP PEDOT and PH1000 normalized with film thickness. (B and C) Deconvolution Raman spectra for SSP PEDOT (B) and PH1000 (C) in the range of 1,300–1,600 cm−1. iScience 2019 12, 66-75DOI: (10.1016/j.isci.2019.01.003) Copyright © 2019 The Author(s) Terms and Conditions

Figure 4 The Molecular Packing of SSP PEDOT (A and B) Atomic force microscopic height images of PH1000 and SSP PEDOT; the image size is 2 × 2 μm. (C) Particle size distribution of SSP PEDOT and PH1000. (D) XRD spectra of SSP PEDOT and PH1000. iScience 2019 12, 66-75DOI: (10.1016/j.isci.2019.01.003) Copyright © 2019 The Author(s) Terms and Conditions

Figure 5 Large-Scale Polymerization and Realization of Flexible Touch Screen The photograph of the SSP PEDOT film synthesized on a 15 × 12 cm PET substrate by sequential solution polymerization with a sheet resistance of 80.3 Ω/sq; see also Video S1. The inset is a 2-in touch sensor made by the SSP PEDOT film; see also Videos S2 and S3. iScience 2019 12, 66-75DOI: (10.1016/j.isci.2019.01.003) Copyright © 2019 The Author(s) Terms and Conditions

Scheme 1 Synthesis of PEDOT Film via Sequential Solution Polymerization (SSP) Schematic diagram of the synthesis procedure of PEDOT film and chemical structure of methanesulfonic acid (MSA), vanadium pentoxide (V2O5), 2,6-di-tert-butylpyridine (DTBP), 3,4-ethylenedioxythiophene (EDOT), and its polymer PEDOT. iScience 2019 12, 66-75DOI: (10.1016/j.isci.2019.01.003) Copyright © 2019 The Author(s) Terms and Conditions