Diamond film possesses extreme physical and chemical properties, such as high hardness (>90 GPa), low friction coefficient (∼0.1),
high thermal conduction (2000 W/m K) and good chemical inertia.
Utilizing these properties for a variety of potential applications has
been a scientific concern in the last decades [1]. In respect of electrochemical applications, diamond films exhibit excellent intrinsic
properties including wide electrochemical potential window, low
background current, good electro-catalytic activity for many redox
reactions when decorated with metal nanoparticles and high chemical stability [2–4]. Therefore, B-doped diamond (BDD) films have
been extensively studied in the fields of electrochemistry [5–7]
and biosensor [8,9]. In addition to the planar diamond films, one