Electropolymerization of electrochromic polymer PEDOT:PSS was performed using a three-electrode configuration. A custom-made platinum coil (Alfa Aesar, 13039) and Ag/AgCl (Warner Instruments, 64-1282) were used as the counter electrode and reference electrodes, respectively. Conducting substrate was used as the working electrode. An aqueous solvent of 10 mM EDOT monomer and 0.1 M NaPSS was deposited using a galvanostatic approach. A constant current of 0.48 mA/cm2 was applied for 1.67 s for each 5-nm PEDOT:PSS film (fig. S4). Electropolymerization process was confirmed by CV measurements in 0.1 M TBAPF6 (Sigma-Aldrich, 281026) in propylene carbonate solution (Sigma-Aldrich, 310328). Selective deposition of PEDOT:PSS on the Au surface was achieved using the same aqueous solvent solution under potentiostatic conditions (740 mV versus Ag/AgCl) for 6.5 s.

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