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Illustration of a 3D graphene micropillar incorporated electrochemical sensor device. The microfluidic channel was patternedin the PDM Slayer for sample loading, and the graphene micropillar was fabricatedin the middle of the micro channel. The working (W), counter(C), and reference(R)electrodes were deposited on a glass substrate. Reprinted from [266], with permission from Elsevier.
