摘要
具有体积小、功耗低、灵敏度高、硅工艺兼容性好等优点的金属氧化物半导体(MOS)气体传感器现已广泛地应用于军事、科研和国民经济的各个领域。然而MOS传感器的低选择性阻碍了其在物联网(IoT)时代的应用前景。为此,本文综述了解决MOS传感器选择性的研究进展,主要介绍了敏感材料性能提升、电子鼻和热调制三种改善MOS传感器选择性的技术方法,阐述了三种方法目前所存在的问题及其未来的发展趋势。同时,本文还对比介绍了机器嗅觉领域主流的主成分分析(PCA)、线性判别分析(LDA)和神经网络(NN)模式识别/机器学习算法。最后,本综述展望了具有数据降维、特征提取和鲁棒性识别分类性能的卷积神经网络(CNN)深度学习算法在气体识别领域的应用前景。基于敏感材料性能的提升、多种调制手段与阵列技术的结合以及人工智能(AI)领域深度学习算法的最新进展,将会极大地增强非选择性MOS传感器的挥发性有机化合物(VOCs)分子识别能力。
Metal oxide semiconductor(MOS)gas sensors have been widely used in military and scientific research,as well as various industries;this is because of the unique advantages of MOS gas sensors including their small size,low power consumption,high sensitivity,and good silicon chip compatibility.However,the poor selectivity of MOS sensors has restricted their potential application in the Internet of Things(Io T)era.In this paper,progress in the research addressing the selectivity issues of MOS sensors is reviewed,and three strategies for selective MOS sensors,and performance improvements of MOS,e-nose,and thermal modulation,are introduced.Research on the performance improvements of MOS-sensitive materials provides an important guarantee for fast and accurate identification of trace gas molecules.The e-nose system adopts an array of sensors with distinct surface chemical properties;more“features”of volatile organic compound(VOC)molecules can be extracted by enlarging the number of sensor arrays,providing a“many-to-one”or“many-to-many”approach to discriminate VOC gas molecules via pattern recognition/machine learning algorithms.For thermal modulation technology,the working temperature of the sensor is intentionally swept during one measurement cycle,and the dynamic response signals of the sensor to different VOC gases under a given temperature mode are tested.Combined with signal processing and pattern recognition/machine learning,the“one-to-many”recognition of VOC gas molecules is realized by a single MOS sensor.Principal component analysis(PCA),linear discriminant analysis(LDA),and neural network(NN)pattern recognition/machine learning algorithms are compared in this review.Among them,the LDA algorithm based on supervised learning can be used as a signal dimension reduction or pattern recognition method.It is mainly applicable to the gas identification and classification of small datasets of VOC gas molecules.LDA is superior to PCA(based on unsupervised learning)in identifying and classifying VOC gas m
作者
刘弘禹
孟钢
邓赞红
李蒙
常鋆青
代甜甜
方晓东
Hongyu Liu;Gang Meng;Zanhong Deng;Meng Li;Junqing Chang;Tiantian Dai;Xiaodong Fang(Anhui Provincial Key Laboratory of Photonic Devices and Materials,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,China)
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2022年第5期26-42,共17页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(11604339,11674324)
中国科学院“百人计划”
中国科学院-日本学术振兴会协议项目(GJHZ1891)
中国科学院与泰国科技发展署合作研究资助项目(GJHZ202101)
量子光学与光量子器件国家重点实验室开放课题(KF201901)资助。
关键词
金属氧化物半导体
气体传感器
电子鼻
热调制
模式识别
机器学习
卷积神经网络
Metal oxide semiconductor
Gas sensor
E-nose
Thermal modulation
Pattern recognition
Machine learning
Convolutional neural network
