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. 2017 Aug 10;7:7803. doi: 10.1038/s41598-017-08141-4

Figure 2.

Figure 2

Nanoelectrode testing – Photocurrent measurements. (a) Light induced photocurrents were recorded when a nanoeletrode was illuminated with a 532 nm green laser in an electrochemical cell. The experimental set-up schematic is shown in (a). A 0.1 M phosphate buffer/0.05 M EDTA solution was used as the electrolyte and standard calomel electrode was used as the reference electrode. (b) A 0.3 V vs Ag(s)/AgCl, reference electrode was applied. A jump in circuit current was observed when a 532 nm green laser was focused on the tip of the nanoelectrode, shown by the green arrow, and the current dropped back to base values when the laser was switched off, shown by black arrow. (c) Photocurrents versus time recordings in extracellular solution when 0.9 V voltage vs Ag(s)/AgCl, reference electrode was applied. (d,e) Photocurrents increase with applied voltage for both electrolytes: 0.1 M phosphate buffer/0.05 M EDTA and NaCl (125 mM) based extracellular solution.