Nanocarbons like graphene, carbon nanotubes (CNTs), and nanofibers are promising for various applications including advanced electronic devices, novel energy systems, and next-generation healthcare diagnostics. This is owing to the excellent physical, chemical and electrochemical properties arising from the ordered atomic structure, the hierarchical nanoscale morphology, and the tunable chemistry of nanocarbons. In particular, high surface area carbon electrodes for biosensors and neural interfaces have consistently been shown to have superior performance when compared to state-of-the-art metal electrodes. Nevertheless, major manufacturing challenges still hinder our ability to scalably produce nanocarbon-based electrodes with tailored morphology and surface chemistry, especially on flexible substrates. For instance, many emerging flexible devices require the fabrication of such nanocarbon electrodes on the surface of polymer substrates. Unlike different transfer technique of CVD-grown nanocarbons, this talk will introduce a unique bottom-up approach for directly growing different types of nanocarbons on polymer films by laser irradiation. The speaker will show how this direct-write process, often referred to as laser-induced graphene (LIG), can be controlled to produce spatially-varying morphologies and chemical compositions of LIG electrodes, by leveraging gradients of laser fluence. Moreover, a method will be introduced to control the heteroatom doping of these LIG electrodes based on controlling the molecular structure of the polymer being lased. Finally, a demonstration of these functional LIG electrodes as electrochemical biosensors will be presented for the detection of the neurotransmitter dopamine with nanomolar sensitivity.
About the Speaker
Dr. Mostafa Bedewy is an Assistant Professor of Industrial Engineering, with secondary appointments in Chemical & Petroleum Engineering, and Mechanical Engineering & Materials Science at the University of Pittsburgh, where he leads the NanoProduct Lab (www.nanoproductlab.org). Before that, he was a Postdoctoral Associate at the Massachusetts Institute of Technology (MIT) in the area of bionanofabrication. In 2014, he completed his PhD at the University of Michigan in Ann Arbor. Dr. Bedewy recently received the Frontiers of Materials Award from the Minerals, Metals and Materials Society (TMS) in 2022, Outstanding Young Investigator Award from the Institute of Industrial and Systems Engineers’ Manufacturing and Design (IISE M&D) Division in 2020, Outstanding Young Manufacturing Engineer Award from the Society of Manufacturing Engineers (SME) in 2018, the Ralph E. Powe Junior Faculty Enhancement Award from the Oak Ridge Associated Universities (ORAU) in 2017, the Robert A. Meyer Award from the American Carbon Society in 2016, the Richard and Eleanor Towner Prize for Distinguished Academic Achievement from the University of Michigan in 2014, and the Silver Award from the Materials Research Society (MRS) in 2013. He has published 43 journal articles, 4 book chapters, and 21 refereed conference papers. His research interests include carbon nanomaterials, laser processing, chemical vapor deposition, nano-, micro-, and biomanufacturing.