Charge-Injection Organic Gauges to Detect Dopamine Down to the Nanomolar Scale


A multilayer self-assembled monolayer (MuL-SAM) composed by i) cysteamine, ii) four-formilphenyl boronic acid and iii) dopamine has been used to functionalize polycrystalline Au. Its electrochemical characterization shows how this surface engineering makes Au reactive toward dopamine. Kelvin probe measurements have shown how MuL-SAM tunes the surface potential of the vacant Au. Such measurements are correlated with the electrical performances of organic field-result transistors (OFETs), whose source/drain electrodes are functionalized by MuL-SAM. Such devices, operated as charge-injection organic gauges (CIOGs), have shown sensitivity to the concentration of dopamine in the vary of [one, fifty] nM.

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