SiM20 Posters

33 Sensors in Medicine 2020 Acknowledgement This work was supported in part by the Sensor Initiative of the King Abdullah University of Science and Technology. References Rahul R. Kamath and Marc J. Madou, Analytical Chemistry, 2014, DOI: 10.1021/ac4033356 N. Wongkaew, M. Simsek, P. Arumugam, A. Behrent, S. Berchmans and A. J. Baeumner, Nanoscale, 2019, DOI: 10.1039/C8NR09232J . Effect of fiber collection time • Increasing the fiber collection time increases the height of the electrode • Increase of electrode height provides better performance, but the needed longer collection time results in increased inhomogeneity of the mat Comparison to IDEA on polyimid foil • Minimal gap size achievable is 200 µm (vs. 40 µm for LCNFs) • Larger gap size results in no redox amplification • With the same starting thickness of foil and mat, higher electrodes are realized on LCNF (100 µm vs. 40 µm) ✓ Easy and inexpensive fabrication ✓ Porous freestanding 3D IDEA device ✓ Optimized widths of fingers (400 µm) and gaps (40 µm) ✓ 4× amplification and 95% collection efficiency Conclusions vs Signal enhancement vs IDEA design • LCNFs-IDEA enabled multiple redox cycling • Decreased gap widths enhance amplification (AE) and collection (CE) efficiency • AE of 4.2 and CE of 95% achieved for 400 µm fingers with 40 µm gap 60µm 90 min -> height ≈95 µm 60µm 135 min -> height ≈125 µm 60µm 45 min -> height ≈75 µm