Prompt Description

The graphic should be divided into three clear zones (from left to right): Left Zone: 'Green Synthesis' Illustration of a Eucalyptus leaf $\rightarrow$ Drops of polyphenol-rich extract. Arrow pointing to a beaker containing $FeCl_3$ showing the color change (yellow to black). 400°C oven icon for calcination of $Fe_2O_3$ NPs. Central Zone: 'Composite Engineering' Illustration of Saponaria officinalis root $\rightarrow$ Activated carbon (porous structure). Diagram of wet impregnation: $Fe_2O_3$ NPs lodging on the surface of the AC. Short text: 'Wet Impregnation (1:5 ratio)'. Right Zone: 'Application & Sensing' Diagram of the electrode (syringe with modified carbon paste). The crucial point: A Cyclic Voltammetry (CV) graph showing a clear increase in the current peak for the modified electrode ($AC/Fe_2O_3$) compared to carbon alone. A small diagram showing the transfer of electrons facilitated by iron to the analyte.