Fig. 1: Optimization of electrochromic performance using Na4Fe(CN)6 agent.
From: Fully biodegradable electrochromic display for disposable patch
a Cyclic voltammograms of deposited W on PLGA with various Na4Fe(CN)6 concentration in NaCl 1 M DIW solution (scan rate = 40 mV s–1). b Cyclic voltammograms of WO3 on ITO with (blue) and without Na4Fe(CN)6 (red) in NaCl 1 M DIW solution (scan rate = 10 mV s–1). Working electrode was connected to ITO counter electrode. c Corrosion of counter W electrodes (100 nm) on glass after 10 cycles with (right) and without (left) Na4Fe(CN)6 in NaCl 1 M DIW solution. The working electrode was WO3 on W electrode and W was deposited on glass by magnetron sputtering. (Aperture F 4.0 and ISO 6400). d Concentration of tungstate ions depending on the presence of Fe(CN)64− ions in NaCl 1 M DIW solution after 10 cycles measured by inductively coupled plasma mass spectroscopy (ICP-MS). Solution was diluted by 100 times of 0.01 M, pH 10 sodium carbonate-bicarbonate buffer solution. e Transmittance at 656 nm wavelength and (f) response time of WO3 on ITO with/without Na4Fe(CN)6 in NaCl 1 M agarose hydrogel at on (red) and off (blue) state, respectively. Operating voltage was –3 V to 2 V without Na4Fe(CN)6 and –1.2 V to 1 V with Na4Fe(CN)6, respectively.
