About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advances in Emerging Electronic Nanomaterials: Towards Next-Generation Microelectronics
|
| Presentation Title |
Spatiotemporal Laser Control of Iron-Oxide-Nanoparticle-Integrated Graphene Microelectrodes for Bioelectronic Sensing |
| Author(s) |
Zhenhao Wu, Soumalya Ghosh, Golnaz Najaf Tomaraei, May Yoon Pwint, Xinyan Tracy Cui, Mostafa Bedewy |
| On-Site Speaker (Planned) |
Zhenhao Wu |
| Abstract Scope |
Laser-induced graphene (LIG) enables direct synthesis and patterning of conductive nanocarbon for flexible electronic and bioelectronic devices, yet miniaturized electrodes often face a trade-off between geometric confinement and conductivity. Here, we integrate precursor engineering with spatiotemporal laser control to fabricate high-resolution LIG microelectrodes from polyimide-iron oxide nanoparticle (PI-IONP) nanocomposites. Fe3O4 nanoparticles enhance near-infrared laser coupling and lower the threshold for graphitic carbon formation, while a sequential 1064 nm MOPA laser process independently tunes pulse duration, energy delivery, and beam focus to confine linewidth and densify conductive networks. Spectroscopic and microscopic characterization confirms porous graphene-like carbon with retained iron-containing nanophases. Compared with neat PI, PI-IONP-derived LIG provides improved access to conductive microelectrodes and enhanced electrochemical response, including reduced impedance, faster charge-transfer kinetics, and sensitive dopamine detection. This combined materials-processing strategy establishes a scalable route toward integrated nanocarbon microelectrodes for next-generation sensing and bioelectronic microdevices. |