High Accuracy Real-Time Multi-Gas Identification by a Batch-Uniform Gas Sensor Array and Deep Learning Algorithm
Semiconductor metal oxide (SMO) gas sensors are attracting great attention as next-generation environmental monitoring sensors. However, there are limitations to the actual application of SMO gas sensors due to their low selectivity. Although the electronic nose (E-nose) systems based on a sensor ar...
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Published in | ACS sensors Vol. 7; no. 2; pp. 430 - 440 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
American Chemical Society
25.02.2022
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Abstract | Semiconductor metal oxide (SMO) gas sensors are attracting great attention as next-generation environmental monitoring sensors. However, there are limitations to the actual application of SMO gas sensors due to their low selectivity. Although the electronic nose (E-nose) systems based on a sensor array are regarded as a solution for the selectivity issue, poor accuracy caused by the nonuniformity of the fabricated gas sensors and difficulty of real-time gas detection have yet to be resolved. In this study, these problems have been solved by fabricating uniform gas sensor arrays and applying the deep learning algorithm to the data from the sensor arrays. Nanocolumnar films of metal oxides (SnO2, In2O3, WO3, and CuO) with a high batch uniformity deposited through glancing angle deposition were used as the sensing materials. The convolutional neural network (CNN) using the input data as a matrix form was adopted as a learning algorithm, which could conduct pattern recognition of the sensor responses. Finally, real-time selective gas detection for CO, NH3, NO2, CH4, and acetone (C3H6O) gas was achieved (minimum response time of 1, 8, 5, 19, and 2 s, respectively) with an accuracy of 98% by applying preprocessed response data to the CNN. |
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AbstractList | Semiconductor metal oxide (SMO) gas sensors are attracting great attention as next-generation environmental monitoring sensors. However, there are limitations to the actual application of SMO gas sensors due to their low selectivity. Although the electronic nose (E-nose) systems based on a sensor array are regarded as a solution for the selectivity issue, poor accuracy caused by the nonuniformity of the fabricated gas sensors and difficulty of real-time gas detection have yet to be resolved. In this study, these problems have been solved by fabricating uniform gas sensor arrays and applying the deep learning algorithm to the data from the sensor arrays. Nanocolumnar films of metal oxides (SnO2, In2O3, WO3, and CuO) with a high batch uniformity deposited through glancing angle deposition were used as the sensing materials. The convolutional neural network (CNN) using the input data as a matrix form was adopted as a learning algorithm, which could conduct pattern recognition of the sensor responses. Finally, real-time selective gas detection for CO, NH3, NO2, CH4, and acetone (C3H6O) gas was achieved (minimum response time of 1, 8, 5, 19, and 2 s, respectively) with an accuracy of 98% by applying preprocessed response data to the CNN. Semiconductor metal oxide (SMO) gas sensors are attracting great attention as next-generation environmental monitoring sensors. However, there are limitations to the actual application of SMO gas sensors due to their low selectivity. Although the electronic nose (E-nose) systems based on a sensor array are regarded as a solution for the selectivity issue, poor accuracy caused by the nonuniformity of the fabricated gas sensors and difficulty of real-time gas detection have yet to be resolved. In this study, these problems have been solved by fabricating uniform gas sensor arrays and applying the deep learning algorithm to the data from the sensor arrays. Nanocolumnar films of metal oxides (SnO , In O , WO , and CuO) with a high batch uniformity deposited through glancing angle deposition were used as the sensing materials. The convolutional neural network (CNN) using the input data as a matrix form was adopted as a learning algorithm, which could conduct pattern recognition of the sensor responses. Finally, real-time selective gas detection for CO, NH , NO , CH , and acetone (C H O) gas was achieved (minimum response time of 1, 8, 5, 19, and 2 s, respectively) with an accuracy of 98% by applying preprocessed response data to the CNN. |
Author | Lee, Kichul Yoon, Kukjin Park, Jaeho Lee, Byeongju Park, Inkyu Kang, Mingu Cho, Incheol Jeong, Jaeseok Del Orbe Henriquez, Dionisio |
AuthorAffiliation | Department of Mechanical Engineering |
AuthorAffiliation_xml | – name: Department of Mechanical Engineering |
Author_xml | – sequence: 1 givenname: Mingu surname: Kang fullname: Kang, Mingu – sequence: 2 givenname: Incheol surname: Cho fullname: Cho, Incheol – sequence: 3 givenname: Jaeho orcidid: 0000-0002-0213-8076 surname: Park fullname: Park, Jaeho – sequence: 4 givenname: Jaeseok surname: Jeong fullname: Jeong, Jaeseok – sequence: 5 givenname: Kichul surname: Lee fullname: Lee, Kichul – sequence: 6 givenname: Byeongju surname: Lee fullname: Lee, Byeongju – sequence: 7 givenname: Dionisio orcidid: 0000-0002-1528-673X surname: Del Orbe Henriquez fullname: Del Orbe Henriquez, Dionisio – sequence: 8 givenname: Kukjin surname: Yoon fullname: Yoon, Kukjin email: kjyoon@kaist.ac.kr – sequence: 9 givenname: Inkyu orcidid: 0000-0001-5761-7739 surname: Park fullname: Park, Inkyu email: inkyu@kaist.ac.kr |
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SubjectTerms | Deep Learning Electronic Nose Environmental Monitoring Oxides Semiconductors |
Title | High Accuracy Real-Time Multi-Gas Identification by a Batch-Uniform Gas Sensor Array and Deep Learning Algorithm |
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