Cryptand-Functionalized Highly Oriented Pyrolytic Graphite Electrodes

Reproducible materials that have detection properties towards a certain molecule are very important for applications in the fabrication of devices. Among all substrates used, highly oriented pyrolytic graphite allows to clearly image monolayer. On other hand, cryptand molecules versatile because they can sense analytes with high selectivity. The electrode was first functionalized an aryl bearing bromine or alkyne group further attach its surface. functionalization performed through electroreduction diazonium salts. While aryl-bromine produced 20 nm-thick dendritic layer, surface terminal 9.7 multilayer. However, if salt is prepared situ, 0.9 nm monolayer aryl–alkyne groups formed. reacted bromo-cryptand Sonogashira C–C coupling reaction yielding electrodes cryptands. These were immersed solution Co(II) resulting Co(II)-cryptate modified electrodes, highlighting ability cryptands’ metal ions. analyzed by X-ray photoelectron spectroscopy after each modification step, which confirmed successful substrate both and cryptate. Cyclic voltammetry studies showed stable current response approximately six cycles. Different reduction processes detected (?1.40 V vs. SCE) cryptate (?1.22 graphite.