|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Functional Nanomaterials 2023
||Heteroatom-Doped Laser-Induced Graphene for Flexible Biosensors of Neurotransmitters with Nanomolar Sensitivity
||Mostafa Bedewy, Ki-Ho Nam, Moataz Abdulhafez, Elisa Castagnola, Golnaz Najaf Tomaraei, Xinyan Tracy Cui
|On-Site Speaker (Planned)
A key challenge in graphene-based flexible devices is direct fabrication on polymeric substrates, especially for microelectrode arrays that penetrate the brain. Moreover, both chemical and morphological control are exceedingly challenging for polymeric devices that cannot withstand the extreme environments necessary for synthesis and doping of graphene. Here, we present a new approach to directly grow 3D porous graphene with controlled heteroatom content on polymers. This process is based on localized laser irradiation of molecularly controlled polyimides for patterning graphene and doping it during laser scanning, wherein polyimide acts as the carbon precursor. We use a two-step polycondensation of 4,4'-oxydianiline with three different tetracarboxylic dianhydrides for fabricating fully aromatic polyimides with various internal linkages such as phenylene, trifluoromethyl or sulfone groups. Among the three different variants we fabricate (N-doped, F-doped, and S-doped), our results show that F-doped graphene microelectrodes exhibit a superior performance for electrochemical detection of dopamine with sub-10-nM concentration.
||Biomaterials, Nanotechnology, Polymers