Fig. 2: Functionalization of the asymmetric geometry diode sensor.
From: Ultrasensitive rapid cytokine sensors based on asymmetric geometry two-dimensional MoS2 diodes
a A cross section schematic diagram. b Sensor functionalization consisting of (glycidoxypropyl) trimethoxysilane (GOPS) and 1-1’carbonyldiimidazole (CDI) linkers that covalently couples the TNF-α binding aptamer to the Al2O3 coated sensor. c I–V curves of the sensor during different stages of the functionalization process. d Fluorescence measurement used to confirm that the aptamers, labeled with a fluorescent dye (FAM dye), were immobilized on the sensor surface. The insets show the micrographs of device sensing area before and after functionalization.
