Structural and electrochemical characterization of novel leucine–gold nanoparticles modified electrode

摘要: Abstract A novel modified electrode was designed and fabricated by linking l -Leucine capped gold nanoparticles to 1,3-propanedithiol self-assembled monolayer (SAM), on substrate. Using UV-Vis FT-IR spectroscopy, we have shown that molecules functionalize the nanoparticles. Morphological characteristics of before after SAM were evidenced TEM tapping™ mode AFM. The properties nanostructured assembly tested for detection Cu(II) ions, employing cyclic voltammetry as investigation techniques. limit 5.4 × 10 −7  M obtained in this case. results compared with those bare or citrate-capped Additionally, Electrochemical Impedance Spectroscopy used further characterize An equivalent electrical circuit developed interpret fit experimental EIS data. contains solution resistance ( R s ), charge-transfer ct Warburg impedance Z Wt – transmissive boundary) a constant phase element (CPE) models behavior double-layer capacitance. found vary concentration within 10 −5 −3 range; saturation tendency observed at higher concentrations.