Fig. 4
From: Introducing all-inkjet-printed microneedles for in-vivo biosensing
Electrochemical impedance spectroscopy response of two adjacent 3 × 3 microneedles arrays in a mint leaf. (a, b, c) Pictures of the 100 µm high microneedles 3 × 3 array, its use for EIS measurements onto a mint leaf, and the penetration marks left on the leaf after the measurements. (d) Bode diagrams of the microneedles and planar electrodes EIS responses compared (the most noisy values for the planar electrode phase have been removed). (e) Nyquist plot of the microneedles response.
