Multifunctional Boron‐Doped Diamond Colloidal AFM Probes

Scanning probe microscopy techniques providing information on conductivity, chemical fluxes, and interfacial reactivity synchronized with topographical information have gained importance within the last decades. Herein, a novel colloidal atomic force microscopy (AFM) probe is presented using a spherical boron‐doped diamond (BDD) electrode attached and electrically connected to a modified silicon nitride cantilever. These conductive spherical BDD–AFM probes allow for electrochemical force spectroscopy. The physical robustness of these bifunctional probes, and the excellent electrochemical properties of BDD renders this concept a unique multifunctional tool for a wide variety of scanning probe studies including conductive AFM, hybrid atomic force–scanning electrochemical microscopy, and tip‐integrated chem/bio sensing. Novel conductive colloidal atomic force microscopy (AFM) probes are presented, taking advantage of the superior physical and electrochemical properties of boron‐doped diamond (BDD). These spherical BDD–AFM–scanning electrochemical probe microscopy (SECM) probes with relatively low force constants are highly suitable for multifunctional scanning probe microscopy (SPM) experiments using the same probe in different SPM techniques ranging from electrochemical force spectroscopy to conductive AFM imaging.