Nitrogen dioxide(NO2)is a representative toxicant in air pollution that mostly arises from the exhaust gas released by automobiles.It is related to various respiratory diseases such as pneumonia and sudden infant death syndrome.Additionally,because the toxicity of nitrogen dioxide is high in overpopulated ar-eas(i.e.,a capital or metropolis),the development of simple,practical,and facile sensors is highly needed.This work presents a flexible and disposable paper-based NO2 sensor based on a reduced graphene ox-ide/chitosan(rGO/CS)composite.The synthesized rGO/CS composite can be easily flexed and deformed into various shapes,which are attributed to chitosan molecules that function as a dispersion and re-duction agent and support material.In addition,this composite can be attached to paper owing to its adhesive property;hence it can be utilized in versatile applications in a disposable manner.By analyzing the conductive change of the rGO/CS composite when it reacts with NO2,we can detect nitrogen dioxide in a concentration range of 0-100 ppm with a detection limit of 1 ppm.Moreover,we performed NO2 detection in the exhaust gas released by automobiles using the rGO/CS composite for practical applica-tion.The results indicated that the rGO/CS composite has the potential to be used in feasible gas sensing as a facile and disposable sensor under various conditions.

Department of Biomechatronics,Sungkyunkwan University,Suwon 16419,Republic of Korea;School of Biomedical Engineering,Korea University,Seoul 02841,Republic of Korea;Department of Biotechnology and Bioinformatics,Korea University,Sejong 30019,Republic of Korea;Department of Electrical Engineering,Korea National University of Transportation,Chungju 27469,Republic of Korea

[1]Hyunjun Park;Woong Kim;Sang Won Lee;Joohyung Park;Gyudo Lee;Dae Sung Yoon;Wonseok Lee;Jinsung Park-.Flexible and disposable paper-based gas sensor using reduced graphene oxide/chitosan composite)[J].材料科学技术（英文版）,2022(06):165-172

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