Oxygen-Vacancy-Induced Synaptic Plasticity in an Electrospun InGdO Nanofiber Transistor for a Gas Sensory System with a Learning Function

Abstract

The perceptual learning function of a simulating human body is very important for constructing a neural computing system and a brainlike computer in the future. The sense of smell is an important part of the human sensory nervous system. However, current gas sensors simply convert gas concentrations into electrical signals and do not have the same learning and memory function as synapses. To solve this problem, we propose a new sensing idea to induce and activate the synaptic properties of transistors by adjusting the oxygen vacancy in the active layer. This sensor combines gas detection with synaptic memory and learning and overcomes the disadvantage of the separation of synaptic transistors and sensors, thus greatly reducing the cost of production. This work combines the detection of N,N-dimethylformamide (DMF) gas with the synaptic mechanism of human olfactory nerves. We successfully fabricated an InGdO nanofiber field-effect transistor by electrostatic spinning and simulated the response of human olfactory synapses to target gas by regulating the oxygen vacancy of the InGdO nanofiber. The synaptic transistor response under different concentrations of unmodulated pulses is tested, and the pavlovian conditioned reflex experiment is simulated successfully. This work provides a new idea of a gas sensor device, which is very important for the development of high-performance gas sensors and bionic electronic devices in the future.

Low-temperature fabrication of Pr-doped In2O3 electrospun nanofibers for flexible field-effect transistors

“…In addition, V O is closely related to the generation of charge carriers. 29 As indicated in the figures, the proportion of O–H species was decreased with the increasing annealing temperature, which may indicate their conversion to oxides. It is noteworthy that when the annealing temperature was increased to 380 °C, the proportion and position of the O–H species peak were hardly changed, indicating that the oxide formation of InPrO NFs was basically completed.…”

Recent advances in neuromorphic transistors for artificial perception applications

“…Li et al [ 85 ] successfully prepared an olfactory synapses of InGdO nanofiber field-effect transistors for target gas detection, as shown in Figure 18(a) . The olfactory synapse integrates human olfactory nerve sensing mechanism with the reduction reaction of dimethylformamide (DMF) with oxygen.…”

“…(d) Responses to the impulse signal at different concentrations. Reproduced with permission [ 85 ]. Copyright 2022, American chemical society.…”

Low‐Cost Fabricated MgSnO Electrolyte‐Gated Synaptic Transistor with Dual Modulation of Excitation and Inhibition

“…The famous Pavlov's dog experiment was successfully simulated in MgSnO EGST. [ 37 ] As depicted in Figure S13a (Supporting Information), the presynaptic electrical spikes applied on the side gates G1 and G2 are regarded as the “ring bell” and the “feeding food,” respectively, while the drain is regarded as the output neuron corresponding to the “salvation” response. As shown in Figure S13b (Supporting Information), MgSnO EGST can replicate traditional associative learning and extinction behavior.…”