Stochastic detection of nanoparticle impacts using printed electrochemical sensor arrays

• Applicant: Professor Dr. Bernhard Wolfrum
• Subject Area: Microsystems ; Measurement Systems
• Term: from 2017 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 393439476

Nanoparticles are increasingly used in consumer and industrial products. As a consequence, particles of different sizes, shapes, and materials are released in large quantities into the environment. In particular, silver nanoparticles are abundantly used in diverse products due to their antimicrobial properties. To assess possible side effects, this calls for efficient methods for the detection and quantification of nanoparticles. Here, we propose to investigate an emerging electrochemical technique for the stochastic detection of particle impacts and develop strategies for the rapid quantification and sizing of silver nanoparticles in salt- and sweet water systems. Understanding electrochemical signals originating from nanoparticle impacts is a fascinating challenge for both, fundamental science and application. Our goal is to elucidate the effects of supporting electrolytes on signal generation during nanoparticle impacts, which is important for reliable quantification in arbitrary aqueous environments. Furthermore, we will address current limitations of nanoparticle sensor systems caused by adsorption using surface modification and microfluidic integration. Systemic studies of the fate and distribution of nanoparticles in the environment require versatile sensing platforms. We will investigate fabrication strategies for disposable printed sensor systems capable of detecting and discriminating different nanoparticles. We believe this will enable future developments for rapid and large-scale monitoring of nanoparticle contamination in remote environments.

• DFG Programme: Research Grants
• Co-Investigator: Dr. Philipp Rinklin