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. 2015 Dec 11;5:18082. doi: 10.1038/srep18082

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(a) Schematic of the flexible pH sensor based on an IZO neuromorphic transistor with multiple gate electrodes. An Ag/AgCl reference electrode immersed in the solution droplet acts as the sensing gate. In-plane Al electrodes are used as the control gates. (b) The schematic image of the capacitive network of the flexible neuromorphic transistor. The carrier density of the IZO channel is modulated by the weighted sum of all inputs of sensing gate and control gates. (c) An optical microscope image of the system (Taken by Dr. Ning Liu). (d) The sensor array fabricated on a flexible PET substrate (Taken by Dr. Ning Liu).