## 2 Flexible Electronics Based on GnPs
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Type of Sample** & **Manufacturing Techniques** & \begin{tabular}{c} **EC (S/m)** \\ **SR (\(\Omega\)/sq)** \\ \end{tabular} & **Durability Tests** & **Reference** \\ \hline Freestanding GnPs & \begin{tabular}{c} Water dispersion and \\ filtration \\ \end{tabular} & \(2\times 10^{6}\) S/m & Not reported & [36] \\ \hline GnPs-Polycarbonate & Extrusion & \(2\times 10^{-6}\) S/m & Not reported & [51] \\ \hline GnP=Nylon 6,6 composite & Solution blending & \(1\) S/m & Not reported & [52] \\ \hline GnPs coupled with ionic & Solution blending and & \(10^{-3}\) S/m & Not reported & [53] \\ liquid ions and epoxy & curing & & & \\ \hline Polyimide substrate & Drop casting & Not reported & Not reported & [54] \\ functionalized with GnPs & & & & \\ \hline Glass, Al\({}_{2}\)O\({}_{3}\) and PET & & & & \\ substrates functionalized with & Screen printing & \(20\) k\(\Omega\)/sq & Not reported & [55] \\ PMMA-GnPs paste & & & & \\ \hline Transparent substrates coated & & & & \\ with GnPs-PEDOT:PSS & & & & \\ \hline GnPs-functionalized paper & Screen printing and rolling & \(4\times 10^{4}\) S/m & Bending (antenna) & [57] \\ \hline GnPs-acrylic paint emulsion on paper & Spray coating, heat-curing and polishing & \(5\times 10^{2}\) S/m & \(100\) abrasion and peeling & [58] \\ \hline GnPs-functionalized paper & \begin{tabular}{c} Filtration via PTFE \\ membrane and transfer \\ printing process \\ \end{tabular} & Not reported & \(1000\) folding cycles at \(180^{\circ}\) and \(-180^{\circ}\) bending angle & [59] \\ \hline Deposition of GnPs on & \begin{tabular}{c} GnPs compression with \\ polymeric substrates, \\ cardboard or textiles \\ \end{tabular} & \(10^{5}\) S/m & \begin{tabular}{c} Hundreds of thousands \\ bending cycles at bending \\ radii of 45 and 90 mm \\ \end{tabular} & [60] \\ \hline GnPs brush coated on & & & \\ GnPs on PMMA with silver & & & \\ nanowires & & & \\ \hline Cellulose impregnated with & & & \\ GnPs/Mater-bi conductive ink & & & \\ \hline Cellulose impregnated with & & & \\ GnPs/Mater-bi conductive ink & & & \\ \hline Cellulose impregnated with & & & \\ GnPs/Mater-bi conductive ink & & & \\ \hline Cellulose impregnated with & & & \\ GnPs/Mater-bi conductive ink & & & \\ \hline Cellulose impregnated with & & & \\ Cellulose acetate and GnPs & Spray and self-impregnation & \(10^{3}\) S/m & \
\begin{tabular}{c} Abrasion cycles (30 min) and \\ tens of \(180^{\circ}\) folding-unfolding \\ cycles at 0 mm bending radius \\ \end{tabular} & [63] \\ \hline GnPs and nanofibrill cellulose & & Solution processing & \(106\) S/m &
\begin{tabular}{c} 100 bending cycles at \(180^{\circ}\) \\ bending angle \\ \end{tabular} & [64] \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Flexible Electronics GnPs-based. We report the manufacturing technique, electrical conductivity (EC) or sheet resistance (SR), durability tests performed and references. EC and SR are related by this formula: EC = 1/(SR \(\times\) t) where t is the thickness of the material. PMMA stays for poly(methyl methacrylate), PET for polyethylene terephthalate, PTFE for polytetrafluoroethylene, PDMA for polydimethylsiloxane and PEDOT:PSS for poly(3,4-ethylenedioxythiophene) polystyrene sulfonate. resistance and enhanced its thermal properties. The GnPs employed by [PERSON] et al. were prepared in their laboratory. Although promising, the manufacture of freestanding GnPs substrates is often complicated and difficult to scale-up. Therefore, scientists explored other approaches depending on the type of polymer employed (i.e., thermoplastic or thermoset). For example, the incorporation of GnPs in thermoplastic polymer matrices led to flexible and conductive materials. Following this procedure, [PERSON] and collaborators [51] extruded polycarbonate-GnPs nanocomposites with improved electrical properties. Such materials preserved ductile and plastic behavior up to 8 wt % GnPs concentration, and exhibited an electrical conductivity of approximately 2.5 \(\times\) 10\({}^{-6}\) S/m. [PERSON] et al.