Direct Laser 3D Printing of Organic Semiconductor Microdevices for Bioelectronics and Biosensors.

Fabrication of conductive and bioactive microdevices has garnered tremendous attention in the emerging biomedical fields, particularly organic bioelectronics and biosensing. Direct laser 3D printing based on two-photon polymerization (TPP) has shown great promise in construction of well-defined and multi-functional microdevices. Herein, we present a novel photosensitive resin for fabrication of highly conductive and bioactive microstructures via TPP. This resin is based on poly(ethylene glycol) diacrylate that is doped with poly (3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (organic semicoductor), and laminin (extracellular matrix protein) or glucose oxidase (biorecognition enzyme). We demonstrate the fabrication of hybrid microelectrodes, bioactive microstructures for cellular adhesion / spreading, and high-performance glucose biosensors. Clinical Relevance- Conductive and bioactive microelectronic devices based on the formulated resin can be utilized for neural recording / stimulation, tissue engineering, and biosensing applications.