Molecular Anchoring with 4-Mercaptobenzoic Acid and 4-Aminothiophenol for Using Active Nanorods in the Detection of Dopamine

The incorporation and effective anchorage of gold nanorods in a (111) substrate is applied to electrochemical systems detect dopamine. Gold (AuNRs) were synthesized dispersion. They then incorporated metal mediated by self-assembled monolayers (SAMs) which act as structural anchors. Two molecular anchors, 4-mercaptobenzoic acid (4-MBA) 4 aminothiophenol (4-ATP) are compared means the charge density (Q) desorption SAMs, where 4-MBA presented greater coverage on surface. Both SAMs allowed confinement communication nanostructure or lesser extent. Characterizations made confirm constructed system. First, nanostructures dispersion characterized UV-visible spectroscopy, Transmission electron microscopy atomic force microscopy. Second, an characterization working electrodes include impedance was made. results focus impact anchor activity sensor, it determined. Reducing transfer resistance (by at least 90% with appropriate SAMs) molecularly anchored increases sensitivity sensor (at 20%), detection dopamine studied square wave voltammetry through calibration curve, better limit obtained Au/4-MBA/AuNRs system Au/4-ATP/AuNRs.