Berlin 2015 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 5: Nanoparticles and Composite Materials I (joint CPP/BP)

BP 5.4: Vortrag

Montag, 16. März 2015, 10:15–10:30, C 243

Electrochemical growth of ZnO nanostructures for biosensing applications — •Raluca - Ancuta Suciu, Nivedita Yumnam, and Veit Wagner — Jacobs University, Bremen, Germany

Biosensors have been used in applications such as blood glucose measuring or pregnancy tests already for a long time, and their improvement is of high interest in many fields of research such as medicine (e.g. diagnostics), military (e.g. monitoring of poison gases) and industry (e.g. food and drink process control). The sensitivity of biosensors can be improved by increasing the surface area where the molecules under observation can bind. Therefore, we have employed ZnO nanorods grown via electrochemical deposition on Au covered flexible PET (polyethylene terepthalate) substrate. The size and distance of ZnO nanostructures can be effectively controlled by tuning the electrochemical deposition parameters. Furthermore, self-assembled monolayer (SAM) of 1-octadecanethiol has been applied on Au to tune the nucleation density of ZnO. Application of SAM prevents overly dense growth of ZnO and instead allows ZnO to electrochemically grow through the pinholes in the SAM. To realize a capacitive sensor additional Au finger contacts have been fabricated using optical lithography. The sensor operation is verified by detection of Streptavidine biomolecules.