## Materials and Methods
### Characterization  
_Nuclear Magnetic Resonance (\({}^{1}\)H-NMR)_ was performed in an Avance(tm) AV Ultrashield spectrometer from Bruker Coorporation (Billerica, MA, USA), with a frequency of 400 MHz. All samples were  
\begin{table}
\begin{tabular}{c c c c} \hline \hline  & \multicolumn{3}{c}{**Conjugated Polymers Solution**} \\ \hline
**Sample** & **Substrate** & **Proc. Technique** & **CPs * \\ \hline _PPsWCt_ & W & & \\ _PPsACt_ & A & Casting (Ct) & PEDOT:PSS \\ _PPsCCt_ & C & & \\ \hline _PPsWSp_ & W & & \\ _PPsASp_ & A & Spray (Sp) & PEDOT:PSS \\ _PPsCSp_ & C & & \\ \hline _PPDWCt_ & W & & \\ _PPDACt_ & A & Casting (Ct) & \\ _PPDCCt_ & C & & \\ \hline _PPDWSp_ & W & & \\ _PPDASp_ & A & Spray (Sp) & \\ _PPDCSp_ & C & & \\ \hline \hline \end{tabular}  
* Polymers were all prepared into a 1.5 wt.% solution.  
\end{table}
Table 2: Polythiophene-derivative/cellulose materials prepared by solution.  
dissolved in deuterated chloroform (CDCl\({}_{3}\), residual reference peak \(\delta\) = 7.26 ppm). Polymer molecular weight was determined by _Gel Permeation Chromatography (GPC)_ using a W1515 Isocratic HPLC Pump from Waters Corp. (Milford, MA, USA). Measurements were carried out in tetrahydrofuran (THF), 99.5+% solution stabilized with 250 ppm of BHT at 35 \({}^{\circ}\)C, and at a flow rate of 1 mL-min\({}^{-1}\) using Styragel Water columns (300 \(\times\) 7.8 mm; 5 \(\upmu\)m nominal pore size) and a W2414 Refractive Index detector from Waters. The system was calibrated with low polydispersity polystyrene standards in the range of 200 to 200 \(\times\) 10\({}^{3}\) g-mol\({}^{-1}\). _ATR-FTIR_ spectra were recorded using a Spectrum Two from Perkin Elmer, Inc. (Waltham, MA, USA) with 4 scans and a resolution of 4 cm\({}^{-1}\). _Thermograviometric Analysis (TGA)_ measurements were carried out in a TA Q500 from TA Instruments (New Castle, DE, USA) under air atmosphere at a heating rate of 10 \({}^{\circ}\)C\(\cdot\)min\({}^{-1}\) up to 700 \({}^{\circ}\)C. _Scanning Electron Microscopy (SEM)_ analysis was recorder using a Hitachi SU-8000 (Tokyo, Japan). For cross-sectional micrographs samples were fractured after immersion in liquid nitrogen and the sections were observed metalized.  
_3D Optical profiles_ measurements were obtained using a Zeta Instruments Zeta-20 3D profiler from KLA-Tencor (Milpitas, CA, USA), with a 50\(\times\) optical objective and 13 nm of vertical resolution. Images were recorded using the real color mode. Areal surface roughness, defined as the arithmetical mean height of the surface (Sa), was obtained in at least three different regions of the samples observed using the Zeta 3D Software (v1.9.5.6.). The _electrical conductivity_ was determined by two methods: _bulk conductivity_ (\(\sigma\)) was measured by electrochemical impedance spectroscopy (EIS) using a Concept 40 broadband dielectric spectrometer from Novocontrol Technologies GmbH & Co. KG (Montabaur, Germany) in the frequency range between 0.1 and 10\({}^{7}\) Hz. Samples of 20 mm of diameter were placed between two gold-plated flat electrodes applying a voltage of 20 mV, and \(\sigma\) was determined in the non-frequency dependent behavior in graph. _Surface conductivity (\(\sigma_{s}\))_ was measured by the 4-point probe method, employing a current range of 1-10 mA taking into account the shape and thickness correction factors [26] with a DC low-current source (LCS-02) and a digital micro-voltmeter (DMV-001) from Scientific Equipment & Services, Roorkee, India. To determine \(\sigma\) and \(\sigma_{\mathrm{s}}\) of pure polymers, samples were previously compressed on pellets of 13 mm of diameter.  
_Flexibility test_: The flexibility test consisted of bending the material in different parts more than twenty times. The materials that showed stiffness, brittleness, or had lost a loss of polymeric material during or after the test, were automatically discarded before performing the electrical measures. Therefore, electrical characterization was measured after the flexibility tests in all materials.