Electrografting of aryl diazonium on thin layer platinum microbands: Towards customized surface functionalization within microsystems

• Published in: Electrochemistry communications Vol. 70; pp. 78 - 81
• Main Authors: Gonzalez-Macia, Laura, Griveau, Sophie, d'Orlyé, Fanny, Varenne, Anne, Sella, Catherine, Thouin, Laurent, Bedioui, Fethi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2016; Elsevier
• Subjects: Analytical chemistry; Chemical Sciences; Click reaction; Diazonium salt; Electrografting; or physical chemistry; Platinum microbands; Surface modification; Theoretical and; Surface modification; Electrografting; Platinum microbands; Click reaction; Diazonium salt
• ISSN: 1388-2481; 1873-1902
• DOI: 10.1016/j.elecom.2016.07.007

The formation of organic thin layers on platinum microbands prepared by photolithography and sputtering techniques following the electrografting of a 4-azidobenzene diazonium salt was evaluated. The electrografting process was characterized by cyclic voltammetry in the presence of reversible redox probes. Further modification of the azide-modified platinum surfaces was achieved by the covalent attachment of ethynylferrocene via the copper(I)-catalyzed azide-alkyne cycloaddition-“click” reaction (CuAAC). Optimization of the electrografting method was performed based on the active ferrocene surface coverage reaching a maximum of 2.5×10−10molcm−2 after ten voltammetric scans. In addition, the modified microbands exhibited a high stability with a recovery of over 75% of the initial ferrocene response after 3weeks of bench storage. This data supports the possibility of rapid and straightforward functionalization of platinum microbands for a range of analytical applications prior to their integration into microdevices. •Electrochemical modification of Pt microbands in microsytems•Electrografting of diazonium salts coupled with “click” reaction•High-stability for over 3weeks