This title appears in the Scientific Report : 2014 

Tailoring the surface potential using Au nanoparticles for bioelectronic applications
Greben, Kyrylo (Corresponding Author)
Li, Pinggui / Mayer, Dirk / Wördenweber, Roger
Bioelektronik; PGI-8
Deutsche Physikalische Gemeinschaft Frühjahrstagung, Dresden (Germany), 2014-03-30 - 2014-04-04
Sensorics and bioinspired systems
Generally the growth of lms (inorganic as well as organic) on a substrate depends strongly on the properties of the carrier. This also holds for the case of bioelectronic applications, where biological material is immobilized on an inorganic electronic, e.g. a semiconductor device. Therefore it is essential to be able to characterize the interface and the surface (structural, chemical but also electronic properties) of the carrier (substrate or electronic) under conditions that are identical or at least comparable to the conditions used during deposition or immobilization. In this work we use the streaming current technique to analyze the surface properties of bio-compatible planar silicon and borosilicate glass substrates with dierent percentage of surface coverage (0 to 100%) of Au. The Au deposition is achieved either by immobilization of dierent concentration of Au nanoparticles or standard evaporation techniques. The isoelectric point changes from pH 3.1 for Si to pH 3.76 for the completely covered substrate in a nonlinear way. Reference measurement and the data obtained for the completely covered surfaces are in good agreement with the literature and measurements on inert materials like polypropylene (IEP at pH 4) and platinum (IEP at pH 3.82).