Autonomous Artificial Olfactory Sensor Systems with Homeostasis Recovery via a Seamless Neuromorphic Architecture

Author:

Jang Young‐Woo12,Kim Jaehyun3,Shin Jaewon12,Jo Jeong‐Wan4,Shin Jong Wook5,Kim Yong‐Hoon6,Cho Sung Woon7,Park Sung Kyu12ORCID

Affiliation:

1. Department of Intelligent Semiconductor Engineering Chung‐Ang University Seoul 06974 South Korea

2. School of Electrical and Electronic Engineering Chung‐Ang University Seoul 06974 South Korea

3. Department of Semiconductor Science Dongguk University Seoul 04620 Republic of Korea

4. Electrical Engineering Division, Department of Engineering University of Cambridge 9 JJ Thomson Avenue Cambridge CB3 0FA UK

5. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, College of Medicine Chung‐Ang University Seoul 06974 South Korea

6. School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 16419 Republic of Korea

7. Department of Advanced Components and Materials Engineering Sunchon National University Sunchon 57922 Republic of Korea

Abstract

AbstractNeuromorphic olfactory systems have been actively studied in recent years owing to their considerable potential in electronic noses, robotics, and neuromorphic data processing systems. However, conventional gas sensors typically have the ability to detect hazardous gas levels but lack synaptic functions such as memory and recognition of gas accumulation, which are essential for realizing human‐like neuromorphic sensory system. In this study, a seamless architecture for a neuromorphic olfactory system capable of detecting and memorizing the present level and accumulation status of nitrogen dioxide (NO2) during continuous gas exposure, regulating a self‐alarm implementation triggered after 147 and 85 s at a continuous gas exposure of 20 and 40 ppm, respectively. Thin‐film‐transistor type gas sensors utilizing carbon nanotube semiconductors detect NO2 gas molecules through carrier trapping and exhibit long‐term retention properties, which are compatible with neuromorphic excitatory applications. Additionally, the neuromorphic inhibitory performance is also characterized via gas desorption with programmable ultraviolet light exposure, demonstrating homeostasis recovery. These results provide a promising strategy for developing a facile artificial olfactory system that demonstrates complicated biological synaptic functions with a seamless and simplified system architecture.

Funder

Ministry of Science and ICT, South Korea

Publisher

Wiley

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