Three-dimensional (3D) graphene with a high specific surface area and excellent electrical conductivity holds extraordinary potential for molecular gas sensing. Gas molecules adsorbed onto graphene serve as electron donors, leading to an increase in conductivity. However, several challenges remain for 3D graphene-based gas sensors, such as slow response and long recovery time. Therefore, research interest remains in the promotion of the sensitivity of molecular gas detection. In this study, we fabricate oxygen plasma-treated 3D graphene for the high-performance gas sensing of formaldehyde. We synthesize large-area, high-quality, 3D graphene over Ni foam by chemical vapor deposition and obtain freestanding 3D graphene foam after Ni etching. We compare three types of strategies-non-treatment, oxygen plasma, and etching in HNO3solution-for the posttreatment of 3D graphene. Eventually, the strategy for oxygen plasma-treated 3D graphene exceeds expectations, which may highlight the general gas sensing based on chemiresistors.

Center for Advancing Electronics Dresden Technische Universität Dresden Dresden D 01069 Germany

Centre of Polymer and Carbon Materials Polish Academy of Sciences M Curie Sklodowskiej 34 Zabrze 41 819 Poland

Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research University of Jinan Shandong Jinan 250022 People's Republic of China

College of Energy Soochow Institute for Energy and Materials Innovations Soochow University Suzhou 215006 People's Republic of China

Dresden Center for Computational Materials Science Technische Universität Dresden Dresden D 01062 Germany

Dresden Center for Intelligent Materials Technische Universität Dresden Dresden D 01062 Germany

High Frequency High Voltage Device and Integrated Circuits R and D Center Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 People's Republic of China

Institute for Complex Materials Leibniz Institute for Solid State and Materials Research Dresden PO Box 270116 Dresden D 01171 Germany

Institute for Materials Science and Max Bergmann Center of Biomaterials Technische Universität Dresden Dresden D 01069 Germany

Institute of Environmental Technology VŠB Technical University of Ostrava 17 Listopadu 15 Ostrava 708 33 Czech Republic

Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 People's Republic of China

Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 People's Republic of China

School of Bioengineering Qilu University of Technology Shandong Academy of Science Jinan 250353 People's Republic of China

School of Chemistry and Chemical Engineering University of Jinan Jinan Shandong Jinan 250022 People's Republic of China

State Key Laboratory of Biobased Material and Green Papermaking Qilu University of Technology Shandong Academy of Sciences No 3501 Daxue Road Jinan 250353 People's Republic of China

State Key Laboratory of Crystal Materials Center of Bio and Micro Nano Functional Materials Shandong University 27 Shandanan Road Jinan 250100 People's Republic of China

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